Influence of Molecular Weight on Thermal and Mechanical Properties of Carbon-Fiber-Reinforced Plastics Based on Thermoplastic Partially Crystalline Polyimide

Gleb Vaganov; Maria Simonova; Margarita Romasheva; Andrey Didenko; Elena Popova; Elena Ivan’kova; Almaz Kamalov; Vladimir Elokhovskiy; Vyacheslav Vaganov; Alexander Filippov; Vladimir Yudin

doi:10.3390/polym15132922

journal article Open Access Jul 01, 2023

Influence of Molecular Weight on Thermal and Mechanical Properties of Carbon-Fiber-Reinforced Plastics Based on Thermoplastic Partially Crystalline Polyimide

Gleb Vaganov

Maria Simonova Margarita Romasheva Andrey Didenko

Elena Popova

Elena Ivan’kova

Almaz Kamalov

Vladimir Elokhovskiy Vyacheslav Vaganov Alexander Filippov Vladimir Yudin

Polymers Vol. 15 No. 13 pp. 2922 · MDPI AG

View at Publisher Save 10.3390/polym15132922

Abstract

For the first time, a study of the influence of the molecular weight of the thermoplastic partially crystalline polyimide R-BAPB on the thermophysical and mechanical properties of carbon plastics was presented. The molecular weight of polyimide was determined using the method of light scattering and the study of the intrinsic viscosity of polyamic acid solutions. To obtain CFRPs, the uniform distribution of polyimide powder on continuous carbon fibers via electrostatic spraying and further hot calendering and pressing were applied. The study of the structure of the obtained carbon plastics via scanning electron microscopy has shown that the growth of the molecular weight of polyimide prevents the impregnation of carbon fiber with the introduced polyimide. Moreover, an increase in the molecular weight of polyimide leads to a rise in glass transition and thermal decomposition temperatures up to 590 °C, while the degree of crystallinity of CFRP falls. Nonetheless, raising the molecular weight from 22,000 to 70,000 g/mol of a binder polymer improves the interlayer fracture toughness G1C by more than five times.

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Published: Jul 01, 2023
Vol/Issue: 15(13)
Pages: 2922
License: View

Authors

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Gleb Vaganov