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Programmable Chromism and Photoluminescence of Spiropyran‐Based Liquid Crystalline Polymer with Tunable Glass Transition Temperature
Author(s) -
Hu Wei,
Sun Chang,
Ren Yunxiao,
Qin Shengyu,
Shao Yu,
Zhang Lanying,
Wu Yu,
Wang Qian,
Yang Huai,
Yang Dengke
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202107048
Subject(s) - spiropyran , mesogen , photoluminescence , merocyanine , glass transition , materials science , polymer , liquid crystal , photochemistry , colored , liquid crystalline , photochromism , chemical engineering , polymer chemistry , nanotechnology , composite material , optoelectronics , chemistry , engineering
Spiropyran‐based materials (SPBMs) can give responses to the stimulations induced by the light, heat, force, or pH, which have been used as triggers for many smart materials. Here, a cross‐linkable SPBM containing mesogenic‐units is synthesized, which is pale‐colored, non‐photoluminescent and non‐mesogenic at a spiro form, but dark‐colored, photoluminescent, and mesogenic at a merocyanine form. Moreover, the dynamic interconversion behavior of the form in the different chemical environments are distinct. Liquid crystalline polymers (LCPs) containing the SPBMs cross‐linked via visible light, own a photoswitchable glass transition temperature ( T g ) and retain the switchable property; however, the SPBMs cross‐linked via UV light will be locked at the MC state, because the molecular movement was frozen at the room temperature lower than the given T g of the LCP. Thus, programmable chromism and photoluminescence based on the tunable T g can be endowed to the functional materials prepared from the SPBMs.