聚硅氧烷侧链高分子液晶的表征  

CHARACTERIZATION OF LIQUID CRYSTAL POLYSILOXANE

作　　者：张维邦[1] 王沛滋[1] 

机构地区：[1]中山大学材料科学研究所

出　　处：《高分子材料科学与工程》1996年第6期96-100,共5页Polymer Materials Science & Engineering

基　　金：国家自然科学基金

摘　　要：合成了以４－烯丙氧基苯甲酸－４－甲氧基苯酚酯及烯丙基胆甾醇醚单独或同时作为液晶基元的侧链聚硅氧烷液晶。用偏光熔点仪、ＤＳＣ和Ｘ射线衍射分析，对侧链聚硅氧烷液晶的液晶性及其受热相转变行为进行了研究。Using 4 methoxo phenol 4 allyloxo benzoate or/and allyl cholesteric ether as mesogen unite the liquid crystall polysiloxane have been synthesized. The liquid crystal phase and phase transition behavior were characterized by polarizing microscope, X ray diffraction and DSC. The results show that the monomers are non liquid crystal and the polymer Ⅰb is nematic phase, the polymer Ⅱb is sematic phase and the polymer Ⅲb is cholesteric phase. The rang of liquid crystal phase ( T i- T g) of the polymers, between 40～100 ℃, are broader than those of monomers. The melting heat (Δ H i) of liquid crystal polymers, about 3 J/g, is much smaller than those of crystals. The cleaning point ( T i) of the liquid crystal polymers, determined by polarizing microscope and DSC, during the cooling process are lower than those in the heating process. The liquid crystal nature and phase transition behavior relationship with structure were discussed.

关 键 词：侧链高分子液晶 聚硅氧烷 液晶相 热转变 

分 类 号：O635.2[理学—高分子化学]