Thermotropic block copolymers: polyesters with flexible poly(tetramethylene glycol) units in the main chain
Thermotropic block copolymers: polyesters with flexible poly(tetramethylene glycol) units in the main chain
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热致嵌段共聚物：主链上具有柔性聚丁二醇单元的聚酯
DOI：
10.1016/0032-3861(93)90477-r
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
M. Rätzsch
中科院分区：
文献类型：
--
作者：
Kerstin Mitrach;D. Pospiech;L. Häussler;D. Voigt;D. Jehnichen;M. Rätzsch
采用高温溶液缩聚法合成了不同长度的聚四甲基乙二醇（PTMG）间隔段和4,4′-（对苯二甲酸二氧基）二苯甲酰单元的嵌段共聚物。通过dsc和WAXS研究确定了间隔长度对交变聚酯的热行为和固相结构的影响，并与纯PTMG进行了比较。在间隔物分子量为650 g mol−1（聚合度，DP≈9）时，获得了具有热致液晶相行为的聚合物。在间隔剂的分子量为1000 g mol−1 （DP≈14）以上，讨论了两晶相共存导致具有块状性质的聚合物。
Block copolymers with poly (tetramethylene glycol)(PTMG) spacers of different length and the 4, 4′-(terephthaloyldioxy) dibenzoyl unit have been synthesized by high temperature solution polycondensation. The influence of the spacer length on thermal behaviour and solid phase structure of alternating polyesters in comparison with pure PTMG has been determined by dsc and WAXS investigations. Up to spacer molecular weights of 650 g mol− 1 (degree of polymerization, DP≈ 9), polymers with thermotropic liquid crystalline phase behaviour are obtained. Above spacer molecular weights of 1000 g mol− 1 (DP≈ 14), the coexistence of two crystalline phases resulting in polymers with block-like character is discussed.