Improving the curing process and thermal stability of phthalonitrile resin via novel mixed curing agents | Zendy

Wu Zuoqiang | Zendy; Han Jianhua | Zendy; Li Nan | Zendy; Weng Zhihuan | Zendy; Wang Jinyan | Zendy; Jian Xigao | Zendy

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Improving the curing process and thermal stability of phthalonitrile resin via novel mixed curing agents

Author(s) -

Wu Zuoqiang,

Han Jianhua,

Li Nan,

Weng Zhihuan,

Wang Jinyan,

Jian Xigao

Publication year - 2017

Publication title -

polymer international

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.592

H-Index - 105

eISSN - 1097-0126

pISSN - 0959-8103

DOI - 10.1002/pi.5328

Subject(s) - curing (chemistry) , phthalonitrile , thermogravimetric analysis , differential scanning calorimetry , thermal stability , materials science , polymer chemistry , bisphenol a , melting point , chemistry , composite material , organic chemistry , phthalocyanine , physics , thermodynamics , epoxy

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

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