摘要
采用聚合物改性合成方法，以聚碳酸酯和对羟基苯甲酸苯酯（ＰＰＨＢ）为原料，克服了聚碳酸酯高温下易酸解脱羧的现象，合成了链结构为（ＯｐｈＣＯ）ｘ［ＯＰｈＣ（ＣＨ３）２ＰｈＯＣＯ］ｙ的液晶聚酯碳酸酯，并借助于ＤＳＣ，１Ｈ—ＮＭＲ，ＦＴＩＲ，ＴＧＡ，热台偏光显微镜和Ｘ光衍射等手段表征了其性能．结果表明，所合成的液晶聚酯碳酸酯具有较高的对数比浓粘度；当（ＯＰｈＣＯ）结构单元含量大于或等于５５ｍｏｌ％时，聚合物能呈现出向列型液晶行为；聚合物的Ｔｇ随着（ＯＰｈＣＯ）单元的增加而变大。
new kind of liquid crystalline Polyestercarbonates with chain structure-(OPhCO)x-(OPhC(CH3)2 phOCO)y-were synthesized for the first time by using polymer modification method. The liquid crystalline properties were studied by 1H-NMR,FTIR, DSC, TGA, POM and X-ray diffraction. The results showed that Polyestercarbonates with higher inherent viscosities can be obtained by using of PPHB as one kind of raw materials and the polymers exhibit nematic thermotropic liquid crystalline behavior as the content of p-oxybenzoate units increases to and over 55mol%. The glass transition temperatures of the polymers increase from 150 to 156℃ when the content of p -oxybenzoate whiz increases from 55mol% to 65mol%.PC /60PHB has good thermostability and will not degrade until 380℃.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1996年第3期330-335,共6页
Acta Polymerica Sinica
基金
国家自然科学重点基金
关键词
液晶
聚酯碳酸酯
液晶性
共聚物
PPHB
Polyestercarbonate, liquid crystal property, Thermal behavior, Polymer modification method
