CPC C07D 491/107 (2013.01) [C08L 83/04 (2013.01); C09K 9/02 (2013.01); C09K 2211/1033 (2013.01)] | 11 Claims |
1. A sensitivity-enhanced spiropyran composite comprising:
(a) spiropyran; and a polymer, an inorganic material or a mixture thereof covalently bound to the spiropyran thereby forming a spiropyran composite, and
(b) a sensitivity enhancing agent to improve sensitivity to mechanical stimulation, partially or totally impregnated at the inner part or the surface of the spiropyran composite which converts the spiropyran composite into a non-polar state thereby forming the sensitivity-enhanced spiropyran composite,
wherein the sensitivity enhancing agent induces isotropic expansion such that the volume ratio of the spiropyran composite prior to impregnation and the sensitivity-enhanced spiropyran composite after impregnation is 1:1.1-2.0;
wherein the sensitivity enhancing agent is selected from a non-polar solvent, an organic material, and an inorganic material and has a relative dielectric constant of 33 or less; and
wherein the sensitivity enhancing agent is impregnated by wet filtration into the spiropyran composite for 1-15 minutes.
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