两种分子量B-N的取向态织构研究

STUDIES OF ORIENTED TEXTURES ON TWO DIFFERENT MOLECULAR WEIGHT COPOLYESTER B-N

用SEM、TEM、OM和SALS等技术研究了两种不同分子量的液晶共聚芳酯B-N的取向态织构。高分子量B_N的取向织构根据剪切速率大小可得到条带织构或细丝状织构,并对相应的微纤结构进行了讨论。低分子量B-N则能呈现多种取向织构,微区织构中晶片的排列暗示了分子指向矢的分布。此外还发现了Williams微区织构与大理石状织构有联系。

The oriented textures of two liquid crystalline copolyester B-N with different molecular weight were studied using SEM, TEM, OM and SALS techniques. Banded texture or tight threadlike texture were obtained in high molecular weight species according to high or low shear rate,the respective fibril structures were discussed. Multiple oriented textures were occured in low molectlar weight species. The arrangement of lamellae in single domain texture, implied the distribution of directors. The relationship between Williams domain texture and marblelike texture was found.