A copolymer having a polyacrylate skeleton as the main chain and a liquid crystal group in the side chain, which copolymer has a number-average molecular weight of 1,000 or above and is composed of repeating acrylate units (I) each having a liquid crystal group bonded thereto by means of an ester linkage via an alkylene chain and repeating acrylate units (II) each having a liquid crystal group bonded thereto by means of an ester linkage via an alkylene chain having a siloxane linkage in a molar ratio of the units (I) to the units (II) of 95/5 to 20/80. This copolymer is a side-chain type of polymer liquid crystal which exhibits liquid crystallinity at a comparatively low temperature, i.e., around room temperature, and is useful as the material of large-area display elements that are driven at low temperature, optical shutters, light-modulating glass, and so forth.
一种主链为聚
丙烯酸酯骨架、侧链为液晶基团的共聚物,该共聚物的数均分子量为 1、000 或以上,由重复的
丙烯酸酯单元(I)和重复的
丙烯酸酯单元(II)组成,前者具有液晶基团,后者具有液晶基团,其液晶基团通过亚烷基链以酯连接的方式与
硅氧烷连接,单元(I)与单元(II)的摩尔比为 95/5 至 20/80。这种共聚物是一种侧链型聚合物液晶,在相对较低的温度下(即室温左右)表现出液晶性,可用作在低温下驱动的大面积显示元件、光学快门、光调节
玻璃等的材料。