Preparation and Properties of Dopamine Modified Polydiacetylene Composite Thermochromic Material
Polydiacetylene is a kind of polymer that can transform conjugate skeleton to lead to change color when the ambient temperature changes.But its thermochromic temperature is high and it is difficult to recover after conformation transformation.The thermochromic materials which meet the application of human temperature intelligent sensing can be obtained by head-group modification.In this study,dopamine was used to modify diacetylene monomer to create covalent bonds at the head group.A double polymerization system(Poly-PCDA-PDA)was produced under 254 nm UV light to investigate the effect of polydopamine on the thermochromic temperature and the reversible recovery property.Composite thermochromic materials were prepared by combining PCDA-PDA with thermoplastic polyurethane(TPU).After modification,the polydiacetylne,whose phase transition point was reduced from 62 ℃ to about 39 ℃,can transform color from blue to purple at 35 ℃.The thermal performance analysis showed that the combination of TPU improved the stability of PCDA-PDA without affecting the thermochromism performance.The thermochromic material is more in line with the application scenario of human temperature environment.This paper provides a strategy for further modification of polydiacetylene by covalent bonding after dopamine-substituted head group,which is expected to play an important role in the research of polydiacetylidene temperature sensing materials.
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