ABSTRACT
YONG SEOK KIM,* KYUNG HOON LEE and JIN CHUL JUNG Center for Advanced Functional Polymers/Polymer Research Institute, Department of Materials Science & Engineering, Pohang University o f Science & Technology, San 31, Hyoja-dong, Pohang, 790-784, Korea
Abstract-Polyimides have been of great interest in engineering and microectronics for a number of applications because of their unique properties. In this study, we prepared a series of polyimides from pyromellitic dianhydrides having two 4-(j?-alkyloxy)phenyloxy groups at their 3 and 6 positions. Also, another series of polyimides containing alicyclic units and alkyloxy side chains were prepared from 9,10-dialkyloxy-l,2,3,4,5,6,7,8-octahydro-2,3,6,7-anthracenetetracarboxylic 2,3,6,7-dianhydrides. Their physical properties such as thermal stability, phase transition and solution properties were investigated. WAXS studies revealed that substituted rigid-rod polyimides had typical well-developed layered structures, while non-rigid-rod polyimides had loosely packed layered structures.
