FIBERS AND FIBER-BASED SUPERSTRUCTURES, THEIR PREPARATION AND USES THEREOF

• US 20100178505A1
• Filed: 12/17/2009
• Published: 07/15/2010
• Est. Priority Date: 12/17/2008
• Status: Abandoned Application

• Current Assignee: Massachusetts Institute of Technology
• Original Assignee: Massachusetts Institute of Technology
• Inventors: RUTLEDGE, Gregory C., Ma, Minglin
• Application Number:
  US12/640,856
• Publication Number:
  US 20100178505A1
• Time in Patent Office: Days
• US Class Current: 428/394
• CPC Class Codes: D01D 10/02 Heat treatment heating for finishing D02J13/00
• CPC Class Codes: D01D 5/0007 Electro-spinning non-woven fabrics produced by electro-spinning D04H1/728
• CPC Class Codes: D01D 5/0015 characterised by the initial state of the material
• CPC Class Codes: D01F 6/00 Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
• CPC Class Codes: D01F 8/04 from synthetic polymers
• CPC Class Codes: D01F 8/10 with at least one other macromolecular compound obtained by reactions only involving carbon-to-carbon unsaturated bonds as constituent
• CPC Class Codes: D04H 1/43828 sheath-core
• CPC Class Codes: D04H 1/43838 Ultrafine fibres, e.g. microfibres
• CPC Class Codes: Y10T 428/2967 Synthetic resin or polymer
• CPC Class Codes: Y10T 428/298 Physical dimension

Abstract

This invention is directed to fibers comprising copolymers or homopolymer blends, superstructures comprising said fibers, process for the preparation of the same and uses thereof. The fibers of this invention have long range order and superstructures produced from said fibers can be used in applications including but not limited to membranes, filtration media, high surface area substrates for sensors and catalysis, stents, tissue scaffolds and drug delivery.

Claims

1. A fiber comprising a copolymer or homopolymer blend wherein said fiber possesses long range order selected from the list comprising concentric lamellae, cylinders, aligned spheres and stacked disks.

2. The fiber of claim 1, wherein said copolymer is a block copolymer comprised of chemically dissimilar monomers wherein said chemically dissimilar monomers are arranged in two or more separate blocks along the length of said block copolymer and wherein said arrangement give rise to phase separation.

3. The fiber of claim 2, wherein said chemically dissimilar monomers are selected from the list comprising styrene, isoprene, butadiene, dimethylsiloxane, methyl methacrylate, acrylonitrile, acrylic acid, ethylene oxide, caprolactone and derivatives thereof.

4. The fiber of claim 1, wherein said copolymer self-assembles into an ordered structure within said fiber and wherein said self-assembly of said copolymer is directed by the chemical dissimilarity of the monomers comprising said copolymer.

6. The fiber of claim 1, wherein said fiber may be encased in a shell material.

7. The fiber of claim 6, wherein said shell material is selected from the list comprising poly(methyl methacrylate), poly(methacrylic acid) and poly(methacrylic acid)/poly(methyl methacrylate) copolymer.

9. The fiber of claim 2, wherein one of the blocks of said block copolymer is chosen for properties selected from the list comprising reactivity with a chemical species, superhydrophobicity, oleophobicity and ease of removal from the fiber following induction of long range order.

15. The fiber of claim 6, wherein said shell material is chosen for its ease of removal from the fiber following induction of long range order.

16. The fiber of claim 1, wherein said copolymer is a block copolymer blended with a homopolymer, wherein said homopolymer is miscible with one of the blocks of said block copolymer.

23. The fiber of claim 1, wherein the diameter of said fiber is from 10-1000 nm and wherein said fiber is at least 100 microns in length.

25. The fiber of claim 1, wherein the long range order of said fiber persists along the length of said fiber.

27. The fibers of claim 1, wherein said fiber exhibits predominantly anisotropic electrical, magnetic or optical properties favoring transmission of electrical, magnetic or optical signals along the length of said fibers.

136. The fiber of claim 1, wherein said fiber is used as a component in a device related to sensors, integrated optical circuits and/or fiber-optic communication devices.

137. The sensors of claim 136, wherein said sensors detects chemical agents, biological agents, trace organic vapors, binding of proteins from solution and the like.

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28. A method of manufacturing a long-range ordered fiber comprising the steps of:

a. Formation of an initial fiber by electrospinning a first solution phase or a first melt phase, wherein said first solution phase or said first melt phase comprises a block copolymer or a copolymer/homopolymer blend and wherein said copolymer comprises polymers of chemically dissimilar monomers; and

b. Annealing said initial fiber to form a fiber comprising long range order selected from the list comprising concentric lamellae, cylinders, aligned spheres and stacked disks.

33. The method of claim 28, wherein said chemically dissimilar monomers are selected from the list comprising styrene, isoprene, butadiene, dimethylsiloxane, methyl methacrylate, acrylonitrile, acrylic acid, ethylene oxide, caprolactone and derivatives thereof.

34. The method of claim 28, wherein said initial fiber further comprises a shell.

36. The method of claim 34, wherein electrospinning from said first solution phase is carried out in the presence of a second solution phase and wherein said second solution phase comprises said shell material.

37. The method of claim 34, wherein said shell material is selected from the list comprising poly(methyl methacrylate), poly(methacrylic acid) and poly(methacrylic acid)/poly(methyl methacrylate) copolymer).

40. The method of claim 34, wherein said shell material comprises material having a higher melting temperature or glass transition temperature than said chemically dissimilar monomers.

41. The method of claim 34, wherein the material comprising said shell is chosen for properties selected from the list comprising reactivity with a chemical species, superhydrophobicity, oleophobicity and ease of removal from the fiber following induction of long range order.

47. The method of claim 34, wherein the composition of said material comprising said shell is varied so that at least one component of said copolymer or at least one component of said homopolymer blend adsorbs preferentially at the interface with said shell.

49. The method of claim 28, wherein said first solution phase comprises a mixture of chloroform and N,N-dimethylformamide and wherein said mixture of chloroform and N,N-dimethylformamide is 75% chloroform and 25% N,N-dimethylformamide and wherein said second solution phase comprises said shell material comprises N,N-dimethylformamide.

52. The method of claim 28, wherein annealing of said initial fiber to form said fiber induces self-assembly of said initial fiber into an ordered structure and wherein said annealing of said initial fiber to form said fiber is chemical or thermal annealing and wherein the temperature of said thermal annealing is higher than the solidification temperature of said copolymer and lower than the solidification temperature of said shell material.

57. The method of claim 28, wherein said copolymer self-assembles into an ordered structure within said fiber and wherein said self-assembly of said copolymer is directed by the chemical dissimilarity of the monomers comprising said copolymer.

68. The method of claim 28, wherein the diameter of said fiber is from 10-1000 nm and wherein said fiber is at least 100 microns in length.

70. The method of claim 28, wherein the long range order of said fiber persists along the length of said fiber.

71. The method of claim 28, wherein said long range order is concentric lamellae.

72. The method of claim 28, wherein said fibers exhibit predominantly anisotropic electrical, magnetic or optical properties favoring transmission of electrical, magnetic or optical signals along the length of said fibers.

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