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首页> 外文期刊>Journal of Applied Polymer Science >Application of a series of novel chain-extended ureas as latent-curing agents and toughening modifiers for epoxy resin
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Application of a series of novel chain-extended ureas as latent-curing agents and toughening modifiers for epoxy resin

机译：一系列新型扩链脲作为环氧树脂的潜在固化剂和增韧剂的应用

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摘要

A series of novel chain-extended ureas (U-i) containing poly(ethylene glycol) (PEG) spacers with different molecular weights were synthesized and the reactive mechanism, reactive activity, impact strength, dynamic mechanical behavior, morphology, and storage properties of the epoxy resin/chain-extended urea system were studied. Experimental results revealed that the impact strength of the epoxy resin modified with chain-extended urea containing a PEG flexible spacer with molecular weight of 1000 is 9.5 times higher than that of the epoxy resin/dicyandiamide system. Results also show that the molecular weight of PEG in chain-extended ureas hardly has any influence on the reactive activity of the chain-extended ureas. The storage life of the epoxy resin/U-i system can be delayed to 38 h at 50 degrees C. (C) 1998 John Wiley & Sons, Inc. [References: 10]
机译：合成了一系列含有不同分子量的聚（乙二醇）（PEG）间隔基的新型扩链脲（Ui），并研究了环氧的反应机理，反应活性，冲击强度，动态力学行为，形态和储藏性能。研究了树脂/扩链尿素体系。实验结果表明，用含有分子量为1000的PEG柔性间隔基的扩链脲改性的环氧树脂的冲击强度比环氧树脂/双氰胺体系的冲击强度高9.5倍。结果还表明，扩链脲中PEG的分子量几乎不影响扩链脲的反应活性。环氧树脂/ U-i系统的储存寿命可以在50摄氏度下延迟到38小时。（C）1998 John Wiley＆Sons，Inc. [参考：10]

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