Liquid-Crystalline Polyamides

Thechemical structures [43] ofthermotropicpolyimideandpolyamideLCP s are described in Chapter 3, along with their crystallization kinetic studies. Kircheldorf et al. [44] carried out XEiD and PLM characterization studies of these TLCPs and found the polyimide to be a smectic liquid crystalline. Pramoda et al. [45] studied the thermal degradation kinetics of TLC-PI (thermotropic liquid crystalline polyimide) and TLC-PA (thermotropic liquid crystalline polyamide). The apparent activation energy in the case of TLC-PI is found to be higher than the TLC-PA for degradation. 

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... 

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/... 

Kato, T., Ihata, O., Ujiie, S., Tokita, M., Watanabe, J. (1998), Self-assembly of liquid-crystalline polyamide complexes through the formation of double hydrogen bonds between a 2,6-bis(amino)pyridine moiety and benzoic acids, Macrvmolecules, 31, 3551-5. 

Similar copolyimide was prepared using 3,7-diamino-2,8(6)-dimethyldibenzothiopheneS,5-dioxide (DDBT) instead of m-SED and its performance for olefin/paraffm separation was investigated [74]. Block copolymers of liquid crystalline polyamide and amorphous PI were prepared from a two-pot polycondensation reaetions [75]. Hydrocarbon (C-2 and C-3) separations in copolyimide dense membranes derived from 6FDA, DDA and 1,5-naphthalene diamine (NDA) was studied [76]. Gas transport properties of 6FDA, DDA and 3, 3 -diaminodiphenyl sulfone (DIDS) was reported [77]. 

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