Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 56, Issue 5, Pages 375-382Publisher
WILEY
DOI: 10.1002/polb.24550
Keywords
fragility; glass transition temperature; local orientational mobility; polyimides; strain-hardening modulus
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Funding
- Russian Federation [14.W01.17.2140-MK]
- Ministry of Education and Science of the Russian Federation [14.Z50.31.0002]
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The dynamic and mechanical properties of the three thermoplastic polyimidescrystallizable polyimide BPDA-P3 and amorphous polyimides ODPA-P3 and aBPDA-P3have been simulated using the atomistic molecular dynamics technique. The three simulated polyimides differ in the chemical structure of their corresponding dianhydride fragments. Analyzing the local orientational mobility of different phenylene rings, it has been established that the increase of the glass-transition temperature (T-g) in the ordered set is caused by the slowing down of the phthalimide rings relaxation in the corresponding dianhydride fragments. It has been observed that rather poor mechanical characteristics upon aBPDA-P3 stretching in the strain-hardening regime are also due to the low orientational mobility of the phthalimide rings. The correlation between the dynamic fragility and the polyimides strain-hardening moduli has been observed; the increase of the dynamic fragility leads to the increase of the strain-hardening modulus. (c) 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 375-382
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