期刊
CHINESE JOURNAL OF POLYMER SCIENCE
卷 40, 期 11, 页码 1349-1359出版社
SPRINGER
DOI: 10.1007/s10118-022-2746-9
关键词
Curing agent; Phthalonitrile resins; Thermosets; Boron-containing polymer
资金
- National Natural Science Foundation of China [51803059, 51873215, 52003272]
- Beijing Natural Science Foundation of China [2204101]
- Youth Innovation Promotion Association of CAS [2017047, 11B-NMR]
In this study, a novel boron-containing monomer was synthesized and used to promote the curing process of a phthalonitrile monomer. The curing behaviors of the system were analyzed using thermal and rheological analysis, and a boron-containing Lewis acid curing mechanism was proposed and verified. The cured polymers showed excellent thermal stability and heat resistance, making this curing system a promising option for the design of high temperature thermosets.
A novel boron-containing monomer, (4-(3,4-dicyanophenoxy)phenyl)boronic acid (BPhPN) was synthesized and used to promote the curing process of phthalonitrile monomer 1,3-bis(3,4-dicyanophenoxy)benzene (MPN). Differential scanning calorimetry and rheological analysis were used to study the curing behaviors of BPhPN/MPN (namely B-MPN), and results suggested that B-MPN systems have better processibility. FTIR spectra and solid-state C-13-NMR exhibited triazine and isoindoline have been formed in the curing process. Boron-containing Lewis acid curing mechanism was preliminarily speculated and verified by two model compounds with different boron chemical environments. The thermogravimetric analysis and dynamic mechanical analysis demonstrated that the cured B-MPN polymers showed excellent thermal stability and heat resistance, which were comparable with conventional catalytic systems for phthalonitrile resins. This study not only presented a novel curing system for phthalonitrile resins, but also shed light on future design of high temperature thermosets.
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