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Improving the thermal and mechanical properties of poly(arylene ether nitrile) films through blending high‐ and low‐molecular‐weight polymers
Author(s) -
Tong Lifen,
Yang Guangyao,
Lei Xiting,
You Yong,
Liu Xiaobo
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.48457
Subject(s) - arylene , glass transition , nitrile , ultimate tensile strength , polymer , materials science , ether , chemical engineering , polymer chemistry , mechanical strength , molecular mass , chemistry , composite material , organic chemistry , alkyl , aryl , enzyme , engineering
In present work, novel phthalonitrile end‐capping poly(arylene ether nitrile)‐phenyl (PEN‐Ph) films with excellent mechanical properties as well as high glass transition temperature were prepared through blending high‐molecular‐weight PEN‐Ph (HMW PEN‐Ph) and low‐molecular‐weight PEN‐Ph (LMW PEN‐Ph). Then, the thermal and mechanical properties of the samples with different mass ratio of HMW PEN‐Ph and LMW PEN‐Ph were studied, and the effect of heat‐treatment temperature on the performance of films was also investigated. The analysis results indicate that the crosslinking density as well as film formation can be controlled by adjusting the mass ratio of HMW PEN‐Ph to LMW PEN‐Ph. Besides, when the mass ratio of HMW PEN‐Ph to LMW PEN‐Ph is 5:2, the film treated at 340 °C possesses the best thermal and mechanical properties, with T g of 218.9 °C and tensile strength of 104.8 MPa, increased by 10.9 °C and 16.6 MPa than pure HMW PEN‐Ph film, respectively. Thus, the presence of LMW PEN‐Ph makes the thermal and mechanical properties of the films improve dramatically, providing the possibility for the application in the electronics and high‐temperature resistant fields. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48457.