研究了刚性二噻吩乙烯除了闭环之外还经历双键异构化的电化学行为。几乎在所有情况下都观察到电致变色,主要途径是开放异构体的氧化诱导环化。研究了环尺寸(以锁定反应性反平行构象)以及取代基(以调节氧化还原电位)对电环化的影响。在具有 6 元环的系列衍生物中,E 异构体和 Z 异构体均转化为闭合异构体,而对于 7 元环,没有观察到 E 异构体的环化。对于带有苯甲腈取代基的刚性二噻吩乙烯和普通二噻吩乙烯,观察到额外且罕见的还原电环化。两种观察到的电环化途径的潜在机制已被阐明。
An image forming medium includes a substrate, and an imaging layer coated on or impregnated into the substrate, wherein the imaging layer includes a photochromic polymer, optionally dispersed in a polymeric binder or a phase change binder, the photochromic polymer including a polymer having at least one photochromic unit grafted therein, wherein the imaging layer exhibits a reversible transition between a colorless state and a colored state in response to heat and light and wherein the imaging layer does not exhibit a transition from the colored state to colorless state when heated in the absence of light.
An image forming medium includes a substrate, and an imaging layer coated on or impregnated into the substrate, wherein the imaging layer includes a photochromic ploymer, optionally dispersed in a polymeric binder or a phase change binder, the photochromic polymer including a polymer having at least one photochromic unit grafted therein, wherein the imaging layer exhibits a reversible transition between a colorless state and a colored state in response to heat and light and wherein the imaging layer does not exhibit a transition from the colored state to colorless state when heated in the absence of light.
HOSE WITH TUNABLE FLEXIBILITY USING CYCLIZABLE, PHOTOCHROMIC MOLECULES
申请人:International Business Machines Corporation
公开号:US20180112018A1
公开(公告)日:2018-04-26
Embodiments of the disclosure generally provide compositions and methods related to articles that display reversible photoresponsive behavior.