摘要
利用侧链带酰氯基的聚硅氧烷与取代偶氮苯酚进行大分子反应,合成了6种以偶氮苯氧羰基为侧链的聚硅氧烷Ⅲ_(a-f);将其中的Ⅲ_(a-c)进行氧化,得到3种以氧化偶氮苯氧羰基为侧链的聚硅氧烷Ⅳ_(a-c)聚合物结构通过核磁共振、红外光谱和元素分析表征,利用偏光显微镜和差热分析仪研究了聚合物的相行为.讨论了苯环上取代基和液晶基元的中心桥键对聚合物液晶性能的影响.
In this paper we report nine polysiloxanes with azobenzene or azoxybenzene mesogens in the side chains. Polysiloxanes Ⅲa-f were synthesized by reacting poly (3-chlorocarbonylpropyl)methyl-siloxane-co-dimethylsiloxane with 4-(4'-substituted phenylazo)phenol or 3-methyl-4 (4'-substituted phenylazo)phenol in 74%-81% yields. By the oxidation of Ⅲa-c,polysiloxanes Ⅲa-c were further prepared. The chemical structures of these polysiloxanes obtained were confirmed by IR,1H NMR and elemental analysis. Their phase behavior were investigated using differential scanning calorimeter (DSC) and polarizing microscope. Six of them, Ⅲa-c and Ⅲa-c,show liquid crystalline properties.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第7期1028-1032,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
液晶聚合物
聚硅氧烷
偶氮苯
Liquid crystalline polymer
Polysiloxane
Azobenzene mesogen
Azoxybenzene mesogen
