Self-repairing, reinforced matrix materials

• US 6,261,360 B1
• Filed: 11/23/1999
• Issued: 07/17/2001
• Est. Priority Date: 06/19/1990
• Status: Expired due to Fees

• Current Assignee: Carolyn M. Dry
• Original Assignee: Carolyn M. Dry
• Inventors: Dry, Carolyn M.
• Primary Examiner(s): MARCHESCHI, MICHAEL A
• Application Number:
  US09/447,894
• Time in Patent Office: 602 Days
• Field of Search: 106/677, 106/676, 106/711, 106/724, 106/729, 106/819, 106/823, 106/802, 106/805, 501/95.1, 753/00, 428/320.2, 428/321.1, 428/321.5, 428/364, 428/375, 523/218, 523/219
• US Class Current: 106/677
• CPC Class Codes: A61L 27/48 with macromolecular fillers
• CPC Class Codes: B28B 17/00 Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping moulds B28B7/00; after-treatment B28B11/00; feeding or discharging B28B13/00; arrangements for embedding elements in the material B28B23/00
• CPC Class Codes: B29C 73/163 Sealing compositions or agents, e.g. combined with propellant agents
• CPC Class Codes: B29C 73/22 the article containing elements including a sealing composition, e.g. powder being liberated when the article is damaged
• CPC Class Codes: C04B 20/0048 Fibrous materials
• CPC Class Codes: C04B 20/0056 Hollow or porous fibres
• CPC Class Codes: C04B 22/006 released by a chemical reaction, e.g. polymer condensation
• CPC Class Codes: C04B 38/0003 containing continuous channels, e.g. of the "dead-end" type or obtained by pushing bars in the green ceramic product B28B takes precedence
• CPC Class Codes: C04B 40/0007 Electric, magnetic or electromagnetic fields
• CPC Class Codes: C04B 40/0028 Aspects relating to the mixing step of the mortar preparation
• CPC Class Codes: C04B 40/0071 making use of a rise in pressure
• CPC Class Codes: C04B 40/0092 Temporary binders, mortars or concrete, i.e. materials intended to be destroyed or removed after hardening, e.g. by acid dissolution
• CPC Class Codes: C04B 40/024 Steam hardening, e.g. in an autoclave
• CPC Class Codes: C04B 40/0263 Hardening promoted by a rise in temperature C04B40/024 takes precedence
• CPC Class Codes: C04B 40/06 Inhibiting the setting, e.g. mortars of the deferred action type containing water in breakable containers ; Inhibiting the action of active ingredients
• CPC Class Codes: C04B 40/0633 Chemical separation of ingredients, e.g. slowly soluble activator
• CPC Class Codes: C04B 40/0675 Mortars activated by rain, percolating or sucked-up water; Self-healing mortars or concrete
• CPC Class Codes: C08J 3/241 Preventing premature crosslinking by physical separation of components, e.g. encapsulation
• CPC Class Codes: C08K 7/00 Use of ingredients characterised by shape
• CPC Class Codes: C08K 7/02 Fibres or whiskers
• CPC Class Codes: C08K 7/22 : Expanded, porous or hollow particles
• CPC Class Codes: Y10S 588/901 : Compositions
• CPC Class Codes: Y10T 428/249994 : Composite having a component wherein a constituent is liquid or is contained within preformed walls [e.g., impregnant-filled, previously void containing component, etc.]
• CPC Class Codes: Y10T 428/249995 : Constituent is in liquid form
• CPC Class Codes: Y10T 428/249997 : Encapsulated liquid
• CPC Class Codes: Y10T 428/2913 : Rod, strand, filament or fiber
• CPC Class Codes: Y10T 428/2933 : Coated or with bond, impregnation or core

Abstract

Self-repairing, fiber reinforced matrix materials include a matrix material including inorganic as well as organic matrices. Disposed within the matrix are hollow fibers having a selectively releasable modifying agent contained therein. The hollow fibers may be inorganic or organic and of any desired length, wall thickness or cross-sectional configuration. The modifying agent is selected from materials capable of beneficially modifying the matrix fiber composite after curing. The modifying agents are selectively released into the surrounding matrix in use in response to a predetermined stimulus be it internal or externally applied. The hollow fibers may be closed off or even coated to provide a way to keep the modifying agent in the fibers until the appropriate time for selective release occurs. Self-repair, smart fiber matrix composite materials capable of repairing microcracks, releasing corrosion inhibitors or permeability modifiers are described as preferred embodiments in concrete and polymer based shaped articles.

Claims

1. A shaped article comprising:

a shaped matrix material having at least one release vessel disposed therein, said release vessel having a releasable modifying agent contained therein and maintaining the modifying agent within the release vessel until released and releasing the modifying agent from the release vessel in the matrix material in response to at least one external stimulus.

2. A shaped article as defined in claim 1, wherein said matrix material is organic.

3. A shaped article as defined in claim 1, wherein said matrix material is inorganic.

4. A shaped article as defined in claim 1, wherein said matrix material is polymeric.

5. A shaped article as defined in claim 1, wherein said matrix material comprises an inorganic polymeric material.

6. A shaped article as defined in claim 1, wherein said matrix material comprises an organic polymeric material.

7. A shaped article as defined in claim 1, wherein said matrix material is cured.

8. A shaped article as defined in claim 1, wherein said matrix material is curable.

9. A shaped article as defined in claim 1, wherein said release vessel is organic.

10. A shaped article as defined in claim 1, wherein said release vessel is inorganic.

11. A shaped article as defined in claim 1, wherein said release vessel comprises a hollow fiber.

12. A shaped article as defined in claim 1, wherein said release vessel comprises an organic polymer.

13. A shaped article as defined in claim 1, wherein said release vessel comprises glass.

14. A shaped article as defined in claim 1, wherein said modifying agent is liquid.

15. A shaped article as defined in claim 1, wherein said modifying agent is solid.

16. A shaped article as defined in claim 1, wherein said matrix material comprises a thermoplastic polymer.

17. A shaped article as defined in claim 1, wherein said matrix material comprises a thermosettable polymer.

18. A shaped article as defined in claim 1, wherein said matrix material comprises a cross-linked polymer material.

19. A shaped article as defined in claim 1, wherein the matrix material is elastomeric.

20. A shaped article as defined in claim 1, wherein said matrix material is a construction material.

21. A shaped article as defined in claim 1, wherein said matrix material is a cementitious material.

22. A shaped article as defined in claim 1, wherein the matrix material is a cement.

23. A shaped article as defined in claim 1, wherein the matrix material comprises concrete.

24. A shaped article as defined in claim 1, wherein the matrix material comprises ceramic.

25. A shaped article as defined in claim 1, wherein the matrix material comprises metal.

26. A shaped article as defined in claim 1, wherein the matrix material is selected from carbide, oxide or hydroxy appetite materials.

27. A shaped article as defined in claim 1, wherein the matrix material comprises a metal selected from the group consisting of aluminum, iron, lead, copper, steel, bronze, phosphor bronze, and brass.

28. A shaped article as defined in claim 1, wherein said release vessel comprises a synthetic organic fiber, inorganic fiber or natural organic fiber.

29. A shaped article as defined in claim 1, wherein said modifying agent comprises an impregnator.

30. A shaped article as defined in claim 1, wherein said modifying agent comprises a sealant.

31. A shaped article as defined in claim 1, wherein said modifying agent comprises adhesive.

32. A shaped article as defined in claim 1, wherein said modifying agent comprises a water barrier.

33. A shaped article as defined in claim 1, wherein said modifying agent comprises an anti-corrosion agent.

34. A shaped article as defined in claim 1, wherein said modifying agent comprises an antifreeze agent.

35. A shaped article as defined in claim 11, wherein said modifying agent comprises a fiber protection modifying agent.

36. A shaped article as defined in claim 1, wherein said release vessel comprises a porous material having a coating, said coating being responsive to the applied external stimulus so that the coating is altered to permit the release vessel to again become porous to permit the modifying agent to be released from the release vessel.

37. A shaped article as defined in claim 1, wherein the modifying agent comprises a dye material.

38. A shaped article as defined in claim 1, wherein the modifying agent comprises a rheological or electro-rheological fluid.

39. A shaped article as defined in claim 11, wherein said release vessel comprises a plurality of modifying agent filled hollow fibers.

40. A shaped article as defined in claim 1, wherein said release vessel comprises a plurality of modifying agent filled hollow fibers disposed in a web arrangement.

41. A shaped article as defined in claim 1, wherein the release vessel is a hollow fiber comprising a shape memory alloy material.

42. A shaped article as defined in claim 1, wherein the release vessel is a hollow fiber comprising a magnetostrictive material.

43. A shaped article as defined in claim 1, wherein the release vessel comprises an electrostrictive hollow fiber.

44. A shaped article as defined in claim 1, wherein the release vessel comprises a first portion disposed in the matrix material and a second portion extending outside the matrix material.

45. A shaped article as defined in claim 1, wherein said modifying agent comprises a repair chemical for repairing micro cracks in the matrix material.

46. A shaped article as defined in claim 1, wherein said modifying agent comprises a solvent for the matrix material.

47. A shaped article as defined in claim 1, wherein the modifying agent comprises a curable composition.

48. A shaped article as defined in claim 1, wherein the modifying agent comprises an adhesive.

49. A shaped article as defined in claim 11, wherein the modifying agent after release is capable of repairing micro cracks in the matrix and re-bonding damage to interfaces between the release vessel and the matrix caused by the external stimulus.

54. A shaped article as defined in claim 1, wherein the matrix material comprises an organic polymer material and the release vessel comprises a particle.

55. A shaped article as defined in claim 1, wherein the release vessel comprises a piezoelectric material.

56. A shaped article as defined in claim 1, wherein the release vessel comprises a particle.

57. A shaped article as defined in claim 36, wherein the release vessel comprises a particle.

58. A shaped article as defined in claim 1, comprising at least one optical fiber.

59. A shaped article as defined in claim 1, further comprising at least one unfilled hollow fiber having a first portion disposed in the matrix and a second portion extending outside the matrix.

60. A shaped article as defined in claim 1, further comprising voids in the matrix material.

129. A shaped article as defined in claim 1, wherein the external stimulus comprises laser excitation.

130. A shaped article as defined in claim 1, wherein the external stimulus comprises an external force applied to the shaped article.

131. A shaped article as defined in claim 1, further comprising at least one other fiber which responds to a stimulus in a manner which is effective to squeeze modifying agent out of a release vessel.

132. A shaped article as defined in claim 131, wherein the other fiber comprises shape memory alloy or a piezoelectric material.

133. A shaped article as defined in claim 131, wherein the other fiber is selected from fibers which change their shape in response to applied light, an applied magnetic field, an applied electric field, an applied voltage, an applied current or a change in the chemical environment.

134. A shaped article as defined in claim 1, wherein the shaped article comprises a covering disposed on a surface.

135. A shaped article as defined in claim 131, wherein the other fiber provides for sensing the shaped article.

136. A shaped article as defined in claim 1, comprising a plurality of release vessels including release vessels including release vessels containing different modifying agents.

137. A shaped article as defined in claim 1, wherein said shaped article comprises a body component for aircraft, spacecraft, automobile, or structural parts.

138. A shaped article as defined in claim 1, wherein said shaped article comprises a molded part.

139. A shaped article as defined in claim 1, wherein said modifying agent comprises a repair chemical for repairing surface cracks in the matrix.

140. A shaped article as defined in claim 1, further comprising one or more other release vessels adapted for sensing a condition of the matrix, for reconfiguring the matrix or for repairing the matrix.

141. A shaped article as defined in claim 1, comprising release vessels disposed within other release vessels.

142. A shaped article as defined in claim 141, wherein the release vessels within other release vessels include fibers within fibers.

143. A shaped article as defined in claim 1, further comprising at least one other release vessel containing a signal material.

144. A shaped article as defined in claim 1, wherein the release vessels may be reused after release has occurred to permit internal sensing or administration of other agents in the matrix.

50. An additive for providing self repairing capabilities and improving final cure properties of a shapeable matrix composition, said additive comprising:

a release vessel having a modifying agent releasably maintained therein and permitting release of the modifying agent from the release vessel into a matrix material in which the release vessel has been added in response to at least one external stimulus.

51. An additive as defined in claim 50, wherein the modifying agent is released from the release vessel into the matrix when the external stimulus acts upon the shapeable matrix composition.

52. A shaped article comprising:

a shaped article including an organic polymer matrix material having at lease one release vessel disposed therein, the release vessel releasably maintaining a modifying agent therein until the shaped article is acted upon by an external stimulus, whereupon, in response to the external stimulus, the modifying agent may be released from the release vessel into the matrix material to cause a structural change in the shaped article.

53. A shaped article comprising:

a body comprising a continuous phase and a discontinuous phase disposed in the continuous phase, the discontinuous phase comprising at least one release vessel releasably maintaining a modifying agent therein and releasing the modifying agent into the continuous phase in response to an external stimulus.

61. A shaped article comprising:

a shaped article including a polymer matrix material having at least one hollow fiber disposed therein, the hollow fiber having a releasable modifying agent contained therein and maintaining the modifying agent within the hollow fiber until released and releasing the modifying agent from the hollow fiber into the matrix material in response to at least one external stimulus.

62. A shaped article as defined in claim 61, wherein said modifying agent, upon release, is effective to cause a structural change in the shaped article after the external stimulus has occurred.

63. A shaped article as defined in claim 61, wherein said polymer matrix material is organic.

64. A shaped article as defined in claim 61, wherein said polymer matrix material is thermoplastic.

65. A shaped article as defined in claim 61, wherein the polymer matrix material is thermosettable.

66. A shaped article as defined in claim 61, wherein the polymer matrix material is elastomeric.

67. A shaped article as defined in claim 61, wherein said hollow fiber is organic.

68. A shaped article as defined in claim 61, wherein said hollow fiber is inorganic.

69. A shaped article as defined in claim 61, wherein said hollow fiber is piezoelectric.

70. A shaped article as defined in claim 61, wherein said hollow fiber is an optical fiber.

71. A shaped article as defined in claim 61, wherein said shaped article further comprises at least one optical fiber disposed in said matrix material.

72. A shaped article as defined in claim 61, wherein said shaped article further comprises at least one unfilled hollow fiber having a first portion disposed in said matrix and a second portion extending outside the matrix.

73. A shaped article as defined in claim 61, wherein said modifying agent comprises a repair chemical for repairing micro and macro cracks in the matrix.

74. A shaped article as defined in claim 61, wherein said modifying agent is selected from the group consisting of solvents for the matrix, curable compositions and adhesives.

75. A shaped article as defined in claim 61, comprising a plurality of hollow fibers arranged in a regular array in said matrix.

76. A shaped article as defined in claim 61, wherein the modifying agent is effective upon release to repair micro and macro cracks in the matrix and re-bond damaged interfaces between the fibers and the matrix caused by the external stimulus.

77. A method for making a self-repairing shaped article comprising the steps of:

providing a shapeable polymer matrix material;

providing at least one release vessel having a releasable modifying agent contained therein and maintaining the modifying agent within the release vessel until released and releasing the modifying agent from the release vessel into a polymer matrix material to which the release vessel has been added in response to at least one external stimulus;

admixing the shapeable polymer matrix material and the at least one release vessel to form a shapeable mixture; and

thereafter shaping the shapeable mixture to form a shaped article in which modifying agent may be released from the release vessel in response to an external stimulus.

78. A shaped article comprising:

a cured matrix material having a plurality of hollow fibers dispersed therein, said hollow fibers having a releasable modifying agent contained therein and maintaining the modifying agent within the fibers until released and permitting release of the modifying agent into the matrix material in response to at least one external stimulus.

79. A shaped article as defined in claim 78, wherein said matrix material is a settable construction material.

80. A shaped article as defined in claim 78, wherein said matrix material is a cementitious material.

81. A shaped article as defined in claim 78, wherein said hollow fibers comprise polypropylene, polyamide, glass, ceramic or cellulose.

82. A shaped article as defined in claim 78, wherein said hollow fibers are elastomeric.

83. A shaped article as defined in claim 78, wherein said hollow fibers are porous polypropylene.

84. A shaped article as defined in claim 78, wherein said modifying agent is a liquid.

85. A shaped article as defined in claim 78, wherein said modifying agent comprises an impregnator, a sealant, an adhesive, a water barrier, an anti-corrosion agent, an anti-freeze agent or a fiber protection agent.

86. A shaped article as defined in claim 78, wherein the hollow fiber comprises a coating material disposed on the hollow fiber.

87. A shaped article as defined in claim 86, wherein said coating maintains the modifying agent within the hollow fiber.

88. A shaped article as defined in claim 78, wherein the modifying agent filled hollow fibers comprise less than about 10 volume percent of said matrix material.

89. A shaped article as defined in claim 78, wherein said matrix material is an inorganic matrix material.

90. A method for making a shaped article comprising the steps of:

preparing a curable matrix material in an uncured state;

adding to the uncured matrix material at least one hollow fiber having a releasable modifying agent contained therein to provide a filled hollow fiber containing matrix material and shaping and curing the filled hollow fiber containing matrix material to provide a shaped article in which the modifying agent may be released from the at least one hollow fiber in response to an external stimulus.

91. An additive for improving final cured properties of a curable matrix composition, said additive comprising:

a hollow fiber having a releasable modifying agent contained therein and maintaining the modifying agent within the fiber until released and permitting release of the modifying agent into a matrix material in which the hollow fiber has been added in response to at least one external stimulus.

92. An additive as defined in claim 91, wherein the hollow fiber comprises polypropylene, polyamide, glass, ceramic or cellulose.

93. An additive as defined in claim 91, wherein said at least one hollow fiber comprises a porous material.

94. An additive as defined in claim 91, wherein the modifying agent is a liquid.

95. An additive as defined in claim 91, wherein the hollow fiber comprises a coating on the hollow fiber.

96. An additive as defined in claim 91, wherein said modifying agent comprises an impregnator, a sealant, an adhesive, a water barrier, an anti-corrosion agent, an anti-freeze agent or a fiber protection agent.

97. An additive as defined in claim 91, wherein the hollow fiber comprises glass.

98. A shaped article comprising:

a shaped matrix material having at least one hollow fiber disposed therein, said hollow fiber having a releasable modifying agent contained therein and maintaining the modifying agent within the fiber until released and releasing the modifying agent from the fiber into the matrix material in response to at least one external stimulus.

99. A shaped article as defined in claim 98, wherein said matrix material is a construction material.

100. A shaped article as defined in claim 98, wherein said matrix material is a cementitious material.

101. A shaped article as defined in claim 98, wherein said hollow fiber comprises polypropylene, polyamide, ceramic, glass or cellulose.

102. A shaped article as defined in claim 98, wherein the hollow fiber is elastomeric.

103. A shaped article as defined in claim 98, wherein the hollow fiber comprises porous polypropylene.

104. A shaped article as defined in claim 98, wherein the modifying agent is a liquid.

105. A shaped article as defined in claim 98, wherein said modifying agent comprises an impregnator, a sealant, an adhesive, a water barrier, an anti-corrosion agent, an anti-freeze agent or a fiber protection modifying agent.

106. A shaped article as defined in claim 98, wherein the hollow fiber comprises a coating disposed on the fiber.

107. A shaped article as defined in claim 98, including a plurality of modifying agent filled hollow fibers present in an amount of less than about 10 volume % of said matrix material.

108. A shaped article as defined in claim 98, wherein said matrix material is inorganic.

109. A shaped article as defined in claim 98, wherein said at least one hollow fiber is organic.

110. A shaped article as defined in claim 98, wherein the hollow fiber is inorganic.

111. A shaped article as defined in claim 98, wherein the modifying agent is a solid.

112. A shaped article as defined in claim 108, wherein said inorganic matrix material is selected from cement, concrete, ceramic or metal matrix materials.

113. A shaped article as defined in claim 112, wherein said ceramic matrix material is selected from carbide, oxide or hydroxy apatite materials.

114. A shaped article as defined in claim 112, wherein said metal matrix material comprises aluminum, iron, led, copper, steel, bronze, phosphor bronze or brass.

115. A shaped article as defined in claim 98, wherein said hollow fiber comprises glass.

116. A shaped article as defined in claim 98, wherein the hollow fiber comprises an optical fiber.

117. A shaped article as defined in claim 98, wherein said hollow fiber comprises a piezoelectric fiber.

118. A shaped article as defined in claim 106, wherein said coating comprises a chemically sensitive coating, an electrically sensitive coating or a radiation sensitive coating.

119. A shaped article as defined in claim 118, wherein said coating is a chemically sensitive coating selected from moisture sensitive coatings, pH sensitive coatings, ion sensitive coatings or solvent sensitive coatings.

120. A shaped article as defined in claim 118, wherein said coating comprises an electrically sensitive coating selected from current sensitive coatings or voltage sensitive coatings.

121. A shaped article as defined in claim 118, wherein said coating comprises a radiation sensitive coating selected from light sensitive coatings, temperature sensitive coatings, or radioactivity sensitive coatings.

122. A shaped article as defined in claim 98, wherein said modifying agent comprises a dye material.

123. A shaped article as defined in claim 98, wherein said article is a containment structure for radioactive or chemical waste materials.

124. A shaped article as defined in claim 98, comprising at least one optical fiber disposed in the matrix.

125. A shaped article as defined in claim 98, comprising a plurality of modifying agent filled hollow fibers disposed in a web arrangement within the matrix.

126. A shaped article as defined in claim 98, wherein said at least one hollow fiber comprises a shaped memory alloy material.

127. A shaped article as defined in claim 98, wherein said at least one hollow fiber comprises a magnetostrictive material.

128. A shaped article as defined in claim 98, wherein the at least one hollow fiber comprises an electrostrictive material.