一系列具有液晶(LC)性质的聚{4'-{(X-甲基丙烯酰氧基亚烷基)甲基氨基} -4-硝基偶氮苯}(p X MAN,其中X是亚甲基单元的数目,范围为2至12)。合成的。当退火至高于其T g时值,整个系列的聚合物表现出稳定的近晶A中间相,而只有间隔更短的材料p2MAN呈现近晶相,随后是向列相。通过X射线衍射确定近晶层的间距,因为近晶层的间距大于完全延伸的侧链但小于两条延伸的链,所以通过侧链介晶的叉指显示分子间的重组。这种行为通过从紫外到可见光谱从非晶态到液晶相转变过程中观察到的温度依赖性聚集得到了证实。中间相的稳定性通过分子间的相互作用得到增强,如焓和热致变色方面的考虑。
This invention provides novel side chain copolymers which exhibit nonlinear optical response, and which have utility as a transparent optical component in all-optical and electrooptical light switch and light modulator devices. An invention side chain copolymer is illustrated by the following structure: ##STR1##
(EN) This invention provides novel side chain copolymers which exhibit nonlinear optical response, and which have utility as a transparent optical component in all-optical and electrooptical light switch and light modulator devices. An invention side chain copolymer is illustrated by structure (I).(FR) Nouveaux copolymères à chaînes latérales présentant une réponse optique non linéaire, et ayant une utilité en tant que composant optique transparent dans un commutateur d'éclairage et dans des dispositifs modulateurs d'éclairage tout optique et électrooptique. Un copolymère à chaîne latérale de l'invention est représenté par la structure (I).
Thermotropic Side-Chain Liquid Crystalline Copolymers Containing Both Mono- and Bisazobenzene Mesogens: Synthesis and Properties
作者:Cristina Cojocariu、Paul Rochon
DOI:10.1021/ma051455h
日期:2005.11.1
The synthesis of a novel series of copolymers containing push−pull bisazobenzene (BAz) and monoazobenzene (MAz) groups with various N-alkyl donor groups and with spacers of two and four methylene units is presented, and the effects of the structural variables on the mesomorphic properties of the polymers are investigated. The copolymer with very short spacer (n = 2) and bulky N-ethyl group exhibits