摘要
以对苯二甲酰氯,2 ,5二[4((S)2甲基丁氧基) 苯甲酰氧基] 对苯二酚和己二醇为单体,采用溶液共缩聚的方法,合成了一系列新的光活性串型液晶共聚物.共聚物通过GPC、DSC、TG、WAXD、偏光显微镜和旋光仪等方法表征.发现所有的共聚物加热至各自的熔点以上都能形成液晶态,在液晶态可以观察到沙地织构或破碎焦锥织构.通过变温X射线衍射证明它们为手性近晶C(S*C) 相.所有共聚物的熔点( Tm) 和液晶态清亮点( Ti) 随共聚物中己二醇用量的改变呈规律性变化.共聚物有很高的旋光性,在合成反应中旋光性保持.
A series of novel optical active shish\|kebab type liquid\|crystalline copolymers was synthesized via solution polycondensation of terephthaloyl chloride with 2,5\|bis\[4\|(S)\|2\|methyl butoxy) benzoyloxy\] hydroquinone and hexandiol.The copolymers were characterized by GPC\,DSC\,TG\,WAXD\,polarizing microscope and rotational analysis instrument.It was found that all the copolymers change to liquid crystal phase when heated to their T m.The broken focal\|conics texture or sanded texture can be observed.Temperature\|variable X\|ray diffraction realized that they are chiral smetic C(S * C) phase.Both melting temperatures ( T m) and isotropization temperatures ( T i) change regularly with varying the hexandiol content in the copolymers.It was found that the rotation was maintained during the synthesis process and all the chiral copolymers were optically highly active.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2000年第1期14-18,共5页
Acta Polymerica Sinica
基金
国家自然科学基金!资助项目( 基金号29674025)
关键词
光活性
串型
液晶共聚物
合成方法
旋光性
表征
Chiral smectic C(S * C) phase, liquid\|crystalline copolymers, Optical activity