Abstract
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 the dispersed phase and inert liquid paraffin as the continuous phase. Each of NMP-CaCl2 solution microdroplet suspended in paraffin served as a microreactor where the polycondensation took place. According to the results of TGA, XRD, IR, SEM and EA, PPTA with good quality was obtained through this novel method, and a number of main factors influencing this process were investigated to determine the optimum condition for the preparation of PPTA. Besides, this two-phase polycondensation system brings many unique advantages compared to the conventional solution polycondensation method, including a sealed reaction environment keeping the reactants away from oxygen and water, easy removal of HCl to promote the reaction, well-controlled temperature and low viscosity which means less energy cost.
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This work was financially supported by the National Natural Science Foundation of China (Nos. U1463208 and 91334201).
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Wang, Pj., Wang, K., Zhang, Js. et al. Non-aqueous suspension polycondensation in NMP-CaCl2/paraffin system — A new approach for the preparation of poly(p-phenylene terephthalamide). Chin J Polym Sci 33, 564–575 (2015). https://doi.org/10.1007/s10118-015-1607-1
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DOI: https://doi.org/10.1007/s10118-015-1607-1