低分子量聚亚苯基苯并二噻唑在稀溶液中的结晶

Crystallization of Low Molecular Weight Poly(p-phenylenebenzobisthiazole) in Dilute Solution

从稀溶液中结晶可得到许多柔性和半刚性高分子的片状单晶,如聚乙烯[1]、聚丙烯[2]、尼龙6[3]、无规聚苯乙烯[4]、聚2-乙烯基吡啶[5]和聚对二氧环己酮[6].这些片状单晶的单层厚度远小于分子链的长度,分子链在层表面发生折叠,多次往复穿过片状晶.

Low molecular weight poly（p-phenylenebenzobisthiazole）（PBZT） was crystallized in sulfuric acid above and below cloud point temperature,respectively,and multi-layer lamellar crystal and fascicular crystal composed of rod-like crystals were obtained.Through transmission electron microscope（TEM） observation and selected area electron diffraction（SAED） study,it was found that,for fascicular crystal,the molecular chains were perpendicular to the direction of long axis of rod-like crystal,and the average width of rod-like crystals was close to the average length of molecular chains.While for lamellar crystal,the molecular chains were perpendicular to the surface of lamellar crystal probably.