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Indexed by:期刊论文

Date of Publication:2017-06-01

Journal:POLYMER INTERNATIONAL

Included Journals:SCIE、EI、Scopus

Volume:66

Issue:6

Page Number:876-881

ISSN No.:0959-8103

Key Words:mixed curing agents; phthalonitrile resin; curing process; thermal stability

Abstract:High curing temperature (including post-curing temperature) and long curing time of phthalonitrile resinsmake them thermally stable but difficult to process. In this paper, novel mixed curing agents (CuCl/4,4'-diaminodiphenylsulfone (DDS) and ZnCl2/DDS) were firstly designed for solving these problems. Bisphenol-based phthalonitrile monomer (BP-Ph; melting point: 228-235 degrees C) was synthesized and used as the curing precursor. Differential scanning calorimetry results indicated that BP-Ph cured with CuCl/DDS and ZnCl2/DDS exhibited curing temperatures close to the melting point of BP-Ph with curing ending temperatures of 225.4 and 287.1 degrees C, respectively. Rheologic investigations demonstrated obvious curing reactions of BP-Ph occurred with the mixed curing agents at 220 degrees C. Thermogravimetric analysis showed that BP-Ph cured by CuCl/DDS or ZnCl2/DDS maintained 95% mass at 573 or 546 degrees C, respectively, at a post-curing temperature of 350 degrees C for 2 h. Reasonable long-term thermo-oxidative stability was also demonstrated. When the post-curing temperature decreased to 290 degrees C, char yield at 800 degrees C of BP-Ph cured by CuCl/DDS was 77.0%, suggesting the curing procedure can be milder when using mixed curing agents. (C) 2017 Society of Chemical Industry