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

作　　者：Xue Xin Yu Rong Linping Su Zhengmei Qiu Chenjun Yang Ming Liang Ping Ji Guoqiang Zhong Zhanyong Yao 

机构地区：[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

出　　处：《Journal of Renewable Materials》2022年第4期1081-1095,共15页可再生材料杂志（英文）

基　　金：The authors acknowledge the financial support of the National Natural Science Foundation of China(No.51908330);the Qilu Young Scholars Program of Shandong University,Natural Science Foundation of Shandong Province(CN)(No.ZR2020ME244),the Fundamental Research Funds of Shandong University(No.2020GN059);the Fundamental Research Funds for the Central Universities,CHD(No.300102210502)and Scientific Research Project of Shandong High-speed Group Co.,Ltd.,(No.SDGS-KJCX-2020-006-08).

摘　　要：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 domainT from 35.7℃ to 48.9℃.

关 键 词：Dynamic mechanical property chemorheology analysis blended epoxy system polyurethane modified resin 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]