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ARTICLE

Dynamic Mechanical and Chemorheology Analysis for the Blended Epoxy System with Polyurethane Modified Resin

by Xue Xin^1,#, Yu Rong^1,#, Linping Su¹, Zhengmei Qiu¹, Chenjun Yang¹, Ming Liang^1,*, Ping Ji², Guoqiang Zhong³, Zhanyong Yao^1,*

1 School of Qilu Transportation, Shandong University, Jinan, 250002, China
2 Shandong Hi-Speed Group Co., Ltd., Jinan, 250014, China
3 Shandong Provincial Communications Planning and Design Institute Group Co., Ltd., Jinan, 250031, China

* Corresponding Authors: Ming Liang. Email: ; Zhanyong Yao. Email:
# Xue Xin and Yu Rong contributed equally to this manuscript

Journal of Renewable Materials 2022, 10(4), 1081-1095. https://doi.org/10.32604/jrm.2022.018021

Received 23 June 2021; Accepted 17 August 2021; Issue published 02 November 2021

Abstract

As the important matrix material, epoxy resin has been widely used in the composites for various fields. On account of the poor toughness of epoxy resin limiting their suitability for advanced applications, considerable interests have been conducted to modify the epoxy resin to meet the engineering requirements. In this study, the bio-based polyurethane (PU) modified resin was adopted to modify the pure bisphenol-A epoxy by blending method with various proportions. Aiming to illuminate the curing behavior, mechanical and thermal properties, the blended epoxy systems were characterized by viscosity-time analysis, dynamic mechanical analysis (DMA) at different frequencies and temperatures, mechanical tensile test, thermogravimetric analysis (TGA) and Fourier transform infrared (FT-IR) spectroscopy. The results indicated that the introduction of PU modified epoxy was found to significantly inhibit the viscosity growth rates especially when the content of PU modified epoxy resin is higher than 60%. Notwithstanding the dynamic modulus and T_g reduced with the increment of PU modified epoxy, remarkable increment on the elongation at break was found and the flexibility was greatly promoted with the introduction of PU modified epoxy. The proportion of PU modified epoxy in the blends should be put balance considerations to obtain optimal mechanical properties. TGA results and FTIR spectrum demonstrated that the addition of PU modified epoxy did not change the thermal decomposition mechanism and chemical reaction mechanism, but the addition of PU modified epoxy inhibits the curing reaction of epoxy resin by measured and calculated the damping temperature domain ΔT from 35.7°C to 48.9°C.

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