(737e) Non-Aqueous Suspension Polycondensation for the Preparation of Poly(p-phenylene terephthalamide)

Authors: 
Wang, P., The State Key Laboratory of Chemical Engineering, Tsinghua University
Wang, K., The State Key Laboratory of Chemical Engineering, Tsinghua University
Luo, G., The State Key Laboratory of Chemical Engineering, Tsinghua University

A non-aqueous suspension polycondensation method was proposed to proceed the reaction of p-phenylenediamine and terephthaloyl chloride for the preparation of poly(p-phenylene terephthalamide) (PPTA). The system was operated with NMP-CaCl2 solution as dispersed phase and inert liquid paraffin as continuous phase. Each of NMP-CaCl2 solution microdroplets suspended in paraffin serves as a microreactor where the polycondensation takes place. Effects of a number of influencing variables affecting PPTA molecular weight were studied experimentally in vessels, including the phase ratio of NMP/paraffin, reaction time, stirring rate, CaCl2 concentration, monomer concentration, monomer molar ratio and temperature. PPTA with the highest weight-average molecular weight of 18,000 were obtained in the experiment. This two-phase polycondensation system brings many advantages, including sealed reaction environment keeping reactants away from oxygen and water, easy removal of HCl to promote the reaction, well-controlled temperature and low viscosity with less energy cost. We have also preceded the polycondensation in a microreactor continuously, and compared the results in the batch process.

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