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Study of gamma‐ray radiation effects on series of bisphthalonitrile resins: Thermomechanical, mechanical, and thermal properties
Author(s) -
Dayo Abdul Qadeer,
Zhang Lili,
Wang Jun,
Liu Wenbin,
Kiran Sadia,
Zegaoui Abdeldjalil,
Ghouti Hamid Abdelhafid,
Arse Yitagesu Bereket
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48313
Subject(s) - thermogravimetric analysis , materials science , thermosetting polymer , fourier transform infrared spectroscopy , irradiation , composite material , dynamic mechanical analysis , thermal stability , thermomechanical analysis , flexural strength , polymer , polymer chemistry , chemical engineering , chemistry , organic chemistry , thermal expansion , nuclear physics , engineering , physics
The bisphthalonitrile (PN) thermosets series (poly(Baph), poly(Bafph), and poly(Bzph)) were prepared and subjected to 100 and 500 kGy γ‐ray irradiation dose from cobalt‐60 ( 60 Co) as a source. The main objective of this present study was to investigate the effects of gamma irradiation on the chemical structure, thermomechanical, mechanical, and thermal stabilities, which were studied by using a Fourier transform infrared (FTIR), dynamic mechanical analysis, bending test, and thermogravimetric analysis, respectively. The PN resins characteristics bands, namely, nitrile, triazine ring, and phthalocyanine, were not affected on γ‐ray irradiation. However, remarkable changes were observed in the chemical structures of benzene, alkyl and CF 3 , which indeed slightly declined the thermal stabilities, thermomechanical and flexural properties. The decrease in properties could be ascribed to the scission of molecular chains and rupture of chemical bonds of PN resin as confirmed by the FTIR. The poly(Bafph) showed a maximum decline in the thermal stabilities and mechanical properties due to the existence of CF 3 in the polymer skeleton, which could not be crosslinked again once scission occurs under radiation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48313.