METHOD FOR MEASURING STRESS LEVELS IN POLYMERIC COMPOSITIONS
First Claim
1. A method for determining the level of stress in a polymeric or pre-polymeric composition within a given volume comprising the steps of:
- (a) providing a polymeric or pre-polymeric composition containing a plurality of microparticles comprising a non-ferromagnetic or non-ferrimagnetic core provided with a coating that is ferromagnetic or ferrimagnetic, or a combination thereof wherein said microparticles are substantially uniformly dispersed throughout said composition, said microparticles having a detectable magnetic characteristic which correlates with the level of stress in the composition within a given volume; and
(b) measuring said magnetic characteristic of said microparticles to determine said level of stress in said composition within a given volume.
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Abstract
A method for measuring the level of stress in a polymeric or pre-polymeric composition within a given volume that includes combining the polymeric or pre-polymeric composition with a plurality of microparticles having a non-ferromagnetic or non-ferrimagnetic core provided with a coating that is ferromagnetic or ferrimagnetic to form an admixture in which the microparticles are substantially uniformly dispersed throughout the composition. The microparticles have a detectable magnetic characteristic which correlates with level of stress in the composition within a given volume. The change in the magnetic characteristic of the microparticles is then measured to determine the level of stress in the composition within a given volume.
28 Citations
36 Claims
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1. A method for determining the level of stress in a polymeric or pre-polymeric composition within a given volume comprising the steps of:
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(a) providing a polymeric or pre-polymeric composition containing a plurality of microparticles comprising a non-ferromagnetic or non-ferrimagnetic core provided with a coating that is ferromagnetic or ferrimagnetic, or a combination thereof wherein said microparticles are substantially uniformly dispersed throughout said composition, said microparticles having a detectable magnetic characteristic which correlates with the level of stress in the composition within a given volume; and
(b) measuring said magnetic characteristic of said microparticles to determine said level of stress in said composition within a given volume. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 30, 31, 34, 35, 36)
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24. A method for measuring the level of stress in a polymeric or a pre-polymeric composition within a given volume comprising the steps of:
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(a) combining said polymeric or pre-polymeric composition with a plurality of microparticles comprising a non-ferromagnetic or non-ferrimagnetic core provided with a coating that is ferromagnetic or ferrimagnetic, or a combination thereof to form an admixture in which said microparticles are substantially uniformly dispersed throughout said composition, said microparticles having a detectable magnetic characteristic which correlates with the level of stress in the composition within a given volume; and
(b) measuring said magnetic characteristic of said microparticles to determine said level of stress in said composition within a given volume. - View Dependent Claims (25, 26, 27, 28, 29)
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32. A method for measuring the level of stress in a polymeric or pre-polymeric composition within a given volume comprising the steps of:
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(a) combining said polymeric or pre-polymeric composition with a plurality of coated glass bubble microparticles, where said coating is ferromagnetic or ferrimagnetic to form an admixture in which said microparticles are substantially uniformly dispersed throughout said composition, said microparticles having a detectable magnetic characteristic which correlates with the level of stress in said composition within a given volume; and
(b) measuring said magnetic characteristic of said microparticles to determine said stress level of said composition within a given volume.
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33. A method of measuring inductance or inductive reactance of a sample comprising the steps of:
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(a) measuring the inductance or the inductive reactance of the sample; and
(b) correcting said measurement of inductance or inductive reactance for temperature.
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Specification