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A Novel Synthesis Process of PPTA by Nitrogen Cooling for Reaction Heat Removal

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Abstract:

Poly (p-phenylene terephthalamide) (PPTA) was synthesized by different processes including single feeding, batch feeding and inlet nitrogen cooling. The effects of these three processes on reaction heat removal of PPTA polymerization were compared. The degree of reaction heat removal was characterized through the changes of system temperature and stirring rate with reaction time. Results suggested that during the processes of batch feeding and nitrogen cooling, system temperature could be effectively decreased and PPTA yields were both larger than 98 %. It indicated that the exothemic heat could be transferred faster and better and monomers could completely react. The inlet incorporation of nitrogen cooling led to the maximum of inherent viscosity (ηinh) of resulted PPTA. This result indicated that nitrogen cooling could effectively transfer the reaction heat and prolong the gel precipitation time of PPTA.

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Periodical:

Advanced Materials Research (Volumes 941-944)

Pages:

1249-1252

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.941-944.1249

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Online since:

June 2014

Authors:

Hong Bin Li, Wen Ying Shi, Yu Feng Zhang*

Keywords:

Batch Feeding, Nitrogen Cooling, PPTA, Reaction Heat Removal

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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