Stress sensing in polycaprolactone films via an embedded photochromic compound.
Stress sensing in polycaprolactone films via an embedded photochromic compound.
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DOI：
10.1021/am100050v
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发表时间：
2010-06
影响因子：
9.5
通讯作者：
McElhanon, James R.
中科院分区：
文献类型：
--
作者：
O'Bryan, Greg;Wong, Bryan M.;McElhanon, James R.
以双官能团吲哚并吡喃为引发剂，通过ε-己内酯开环聚合制备了一种具有机械变色行为的光致变色聚合物。光致变色引发物种在聚合物主链中的构型导致了机械变色效应，聚合物薄膜的变形导致螺环C−O键的开环，形成有色的花菁。采用拉伸模式下动态力学分析(DMA)的主动应力监测方法，研究了紫外光照射对恒定应变下聚合物薄膜的影响。在紫外光照射下，聚合物的应力发生负变化，约为50千帕。最后，用密度泛函理论(DFT)和含时密度泛函理论(TDDFT)计算建立了机械变色效应模型。分子伸长率为-gt；39%时，相对分子能量和吸收波长急剧增加，螺氧原子电荷急剧减少。
A photochromic polymer exhibiting mechanochromic behavior is prepared by means of ring-opening polymerization (ROP) of ε-caprolactone by utilizing a difunctional indolinospiropyran as an initiator. The configuration of having the photochromic initiating species within the polymer backbone leads to a mechanochromic effect with deformation of polymer films leading to ring-opening of the spiro C−O bond to form the colored merocyanine. Active stress monitoring by dynamic mechanical analysis (DMA) in tension mode was used to probe the effects of UV irradiation on polymer films held under constant strain. Irradiation with UV light induces a negative change in the polymer stress of approximately 50 kPa. Finally, a model of the mechanochromic effect was performed using density functional theory (DFT) and time-dependent DFT (TDDFT) calculations. A sharp increase in the relative molecular energy and the absorption wavelength as well as a drastic decrease in the spiro-oxygen atom charge occurred at a molecular elongation of >39%.
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影响因子：
3.2
作者：
KIM, SJ;RENEKER, DH
通讯作者：
RENEKER, DH
影响因子：
4.6
作者：
BLAIR, HS;POGUE, HI
通讯作者：
POGUE, HI
影响因子：
1.8
作者：
SMETS, G;DEBLAUWE, F
通讯作者：
DEBLAUWE, F
影响因子：
3.6
作者：
Guo, XF;Zhang, XF;Zhu, DB
通讯作者：
Zhu, DB
螺吡喃的光致异构化驱动分子穿梭
影响因子：
5.2
作者：
Zhou, Weidong;Chen, Dugang;Li, Yuliang
通讯作者：
Li, Yuliang