A novel addition curable novolac bearing phthalonitrile groups: synthesis,characterization and thermal properties |
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Authors: | Yang Yang Zhang Min Lei Yi |
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Affiliation: | (1) College of Polymer Science and Engineering, Sichuan University, State Key Laboratory of Polymer Materials Engineering of China, 610065 Chengdu, P.R. China |
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Abstract: | Summary Novel phenolic novolac resins, bearing phthalonitrile groups anchored to benzene ring through phenyl azo linkage were realized
by the coupling reaction between novolac and phthalonitrile diazonium salt. The diazo-coupling occurred to a maximun of about
61%. The apparent molecular weight, determined form GPC showed a downward drift with increase in degree of phthalonitrile
substitution. Analysis using DSC technique indicated that the resin underwent curing in a temperature range form 290 to 320 °C
. The curing occurred via addition polymerization of phthalonitrile groups. The thermal stability and anaerobic char yield
of the polymers increased proportion to the crosslinking. The probable cure mechanics were discussed. |
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Keywords: | |
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