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8309538 
Meetings & Symposia 
Study on the effect of non-solvent on the polymerization of poly(p-phenylene terephthalamide) (PPTA) 
Jiao, Y; Zhang, R; Kong, H; Han, K; Ma, Y; Yu, M 
2011 
Chemical Industry Press 
Shanghai 
2011 International Conference on Advanced Fibers and Polymer Materials, ICAFPM 2011 
65-67 
English 
Polymerization of PPTA (poly (p-phenylene terephthalamide)) is a rapid process even at low temperature, which makes the molecular weight distribution of PPTA wider. In this article, a new method is firstly employed in order to narrow the molecular weight distribution by adding a non-solvent, n-hexane, to the reaction system. The reaction time was then apparently extended, and the time when PPTA precipitated from the solvent was delayed. Both of those two effects finally result in a higher molecular weight and narrower molecular weight distribution. 
Non-solvent; PPTA synthesis; Solution viscosity