热致液晶共聚酯与聚酯热塑弹性体复合物的制备与性能  

PREPARATION AND PROPERTIES OF COMPOSITES OF THERMOTROPIC LIQUID CRYSTALLINE COPOLYESTERS AND POLYESTER THERMOPLASTIC ELASTOMER

作　　者：李君[1] 吴美琰[2] 

机构地区：[1]北京师范大学化学学院,北京100875 [2]中国科学院化学研究所,北京100080

出　　处：《高分子学报》2006年第1期102-107,共6页Acta Polymerica Sinica

摘　　要：原位缩聚法制备了一系列（对羟基苯甲酸．对苯二甲酸-间苯二酚）（HB-TA-RES）热致液晶共聚酯与聚对苯二甲酸丁二酯．聚四亚甲基醚热塑弹性体（PBT-PTMG）复合物，并用POM。TGA。WAXD，SEM及动态应力流变仪等手段进行了表征．复合物在较宽的共聚酯含量范围（30wt％-70wt％）或共聚酯组成不同时（共聚酯中HB含量20mol％-80mol％）均具有热致液晶行为．当复合物中共聚酯含量≤50wt％以及共聚酯中对羟基苯甲酸（HB）含量≤60mol％时，共聚酯分子的结构更加均匀化。结晶组分的结晶行为受到限制，基体与液晶组分具有较好的复合效果，不表现明显的相分离行为．复合物与相应的纯共聚酯相比，具有较好的热稳定性；其粘度均比基体PBT-PTMG小．当复合物中共聚酯含量≥30wt％时，其粘度下降尤为显著，表明其具有较好的加工性．The composites of thermotropic liquid crystalline copolyesters （（p-hydroxy benzoic acid）-terephthalic acid-resorcin） （HB-TA-RES） and poly（butylene terephthalate）-poly（tetramethylene glycol） thermoplastic elastomer （PBT-PTMG） with different copolyester content or copolyester composition were prepared by in-situ polycondensation method. The obtained （HB-TA-RES）/PBT-PTMG were characterized by POM, TGA, WAXD, SEM and rheological analysis. Liquid crystalline behavior of the composites was observed when the HB content in copolyester was 40mol% and copolyester content in composite was 30 wt% - 70 wt% or copolyester content in composite was around 50 wt % and HB content in copolyester was 20 mol % - 80 mol %. When the copolyester content in composites ≤50 wt% or HB content in copolyester≤60 mol%, no obvious phase separation happened. The molecular structure of copolyester in composites was more homogeneous and the crystallization of HB was limited. The good thermal stability of （HB-TA-RES）/PBT-PTMG composites with thermotropic liquid crystalline behavior was obtained as compared with the corresponding homocopolyester and the viscosity of the composites was lower than that of the matrix PBT-PTMG especially when the copolyester content was more than 30 wt%. Good processability of the composite is expected in the application.

关 键 词：原位缩聚法 热致液晶共聚酯 聚酯热塑弹性体 复合物 

分 类 号：TQ334[化学工程—橡胶工业]