聚亚苯基苯并二噻唑的X射线衍射研究

本文用X射线衍射研究了聚亚苯基苯并二噻唑(PBT)薄膜的结构特征。衍射结果表明PBT在液晶态成膜具有高的取向度,分子链在垂直于取向方向呈有序的二维周期排列,沿取向方向分子链相互间无序平行排列。热处理可明显提高PBT的有序度,即在垂直于取向方向分子链的二维排列更规整,晶格畸变减小,而取向方向分子链中苯杂环呈群集排列,出现三维有序的衍射斑点,测其群集结构平面的法线与取向方向夹角为29°。

X-RAY DIFFRACTION IN POLY (P-PHENYL- ENEBENZOBISTHI AZOLE)

The structural characteristics of poly (p-phenylenebenzobisthiazole) (PBT) film have been studied by X-ray diffraction method. The results of experiments show that PBT film which formed in liquid crystalline phase is high orientated. The molecular chains in the plane which perpendicular to the direction of orientation arrange in two-dimensions order while along the direction of orientation arrange in disorder. By annealing the PBT film, we found the regularity of the two-dimensions arrangement of molecular chains in the plane which perpen-dicular to the direction of orientation increases obviously and the distortion of lattice decreases.Moreover the benzene heterocyclic rings in the molecular chains along the orientation direction exibit cybotactic state and the diffraction pattern of X-ray showing the three-dimensions order appears. The angle between the normal line of the cybotactic plane and theorientation direc-tion is 29°.