期刊
LIQUID CRYSTALS
卷 44, 期 14-15, 页码 2379-2390出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2017.1335894
关键词
Terpolymer; azo-liquid crystals; photo chromism; optical properties
资金
- National Natural Science Foundation of China [51273035]
- Fundamental Research Funds for the Central Universities [N130205001]
- Scientific and Technical Bureau Foundation of Shen Yang City [F16-205-1-03]
A series of side-chain cholesteric polysiloxanes (PQ) were synthesised with poly(methyl-hydrogeno) siloxane, cholesterol (4-allyoxybenzoate) (M-1 ), and 4-hydroxyphenyl-4(allyloxy) phenylpropanoate (M-2), 4-allyloxy-4 '-cyanobiphenyl (M-3 ). Then azo-containing chiral liquid crystalline polymer (PZ) were synthesised with PQ and 4-(4-hexyloxyphenylazo) benzoic acid (M-4) by esterifying catalysed by 4-dimethylaminopyridine which is a new synthetic way. The chemical structures of monomers and polymers were confirmed by conventional spectroscopic methods and test methods for liquid crystal properties. The photo-induced isomerisation of the polymer is investigated by UV-vis spectroscopy. Weight lost temperatures (5%) for all polymers were greater than 298 degrees C. The results showed that the introducing of azo moieties makes the polymer more stable on thermo dynamics. The transition temperatures of the polymers PQ and PZ exhibited some regularity as the change of ingredients of polymers. PQ series showed Grandjean textures and PQ(1)-PQs exhibited blue selective reflection in the visible light region. PZ(1) -PZ(5) also showed Grandjean textures and the texture colour of the polymer turned to red and colourful with green and blue due to increasing contents of azo moiety, and yellow selective reflection in the visible light region were observed. The molecular design introducing shorter and harder part into chiral polymerisation system is favourable to the appearance of selective reflection. All polymers turned out right-handed optical activity due to having the same cholesteric group, the photo-responsive behaviours of the PZ series were also investigated.
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