Polyamide-amorphous polyimide composites

Acid anhydrides, 391 Amino hydrochloride water solutions, lyotropic phases, 306-308,310/ Amorphous polyimide-liquid-crystalline polyamide composites. See Liquid-crystalline polyamide-amorphous polyimide composites Amphiphilic liquid crystal(s), establishment, 235,236/... 

Molecular Composites of Liquid-Crystalline Polyamides and Amorphous Polyimides... 

In this article, the synthesis, characterization, rheology, solution processing, and mechanical properties of novel molecular composites are discussed. These molecular composite are block copolymers composed of a liquid-crystalline polyamide and two amorphous polyimides. Also, the rheological properties of both isotorpic and anisotropic solutions of PBTA homopolymers and PBTA/PI block copolymers are... 

Materials The materials in this work includ< a lyotropic polyamide (PBTA) composed of terephthaloyl dichloride and 2,2 -dimethyI-4,4-diamino-biphenyl two amorphous polyimides respectively con sting of 3,3 4,4-benzophenone tetracarboxylic dianhydride (BTDA) and 2,3,5,6-tetrameth -p-phenylene diamine (TMPD), as well as 4,4 -(hexafluoroisopropylidene)>bis(phthalic anhydride) (6FDA) and 2,2-dimethyl-4,4-diamino-biphenyl (DMDB) and the block copolymers composed of PBTA and those two polyimides with various compositions. Ilie PBTA/PI block copolymers and the corresponding homopolymers were prepared according to our previous work(79). 

An empirical method for predicting the chemical compositions of random or partially ordered condensation copolymers which are capable of exhibiting mesophases (either in solution or in the melt) was devised by the author in 1989, while working on liquid crystal copolymer synthesis for BP Chemicals. A brief description of the method and its application to the chemical synthesis of amorphous thermotropic polyamides has been given in a previous paper [45] and a further more detailed description of the method is to be published shortly [46]. Subsequently, the method has been updated and applied to polycarbonates and polyimides. Thermotropic polyimides have also been synthesised by the author resulting from the use of the predictive method [43]. 

Chang K Y and Lee Y D (1993) Molecular composite. 1. Novel block copolymers of liquid-crystaUine polyamide and amorphous polyamide/polyimide, J Polym Sci Part A Polym C iem 31 2775-2784. 

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