Title: Evaluation of Silicon-containing Phthalonitrile Polymers- Properties, and Degradations

Authors: William J. Monzel, Guo-Quan Lu, Timothy L. Pruyn, Christopher L. Houser, and Gordon T. Yee

DOI: 10.33599/nasampe/s.19.1534

Abstract: Phthalonitrile polymers are of interest as resins for high temperature polymer matrix composites and encapsulation of wide band-gap power modules. However, their long-term use at temperatures above 250 °C is limited by oxidative degradation. The inclusion of organosilicon moieties into the polymer structure may provide higher temperature performance in oxidizing environments while maintaining good processing characteristics. In this work, several phenyl-substituted organosilicon linkages were incorporated to investigate their effect on processing, thermo-mechanical properties, and thermal and oxidative stability. Three silicon-containing phthalonitrile monomers were synthesized incorporating diphenoxydiphenylsilane, tetraphenylsilane, and hexaphenyldisiloxane moieties. Increasing the purity of monomers adversely affected the processing, glass transition, and stability. Processability was highly dependent on catalyst content and an ideal concentration was determined. The impact on glass transition, coefficient of thermal expansion, stability in TGA, and long-term oxidative stability at 250 °C was evaluated. Degradations were examined in more detail via IR-TGA. Results are compared with commercial phthalonitriles and relevant literature.

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Conference: SAMPE 2019 - Charlotte, NC

Publication Date: 2019/05/20

SKU: TP19--1534

Pages: 15

Price: FREE