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材料工程  2006 

柔性胺改性剂对环氧树脂力学性能的影响

Keywords: 柔性胺,环氧树脂,力学性能,拉伸强度,冲击强度

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Abstract:

以柔性胺D-230作为改性剂,用浇铸成型法制备了环氧树脂结构胶,研究了其力学性能与D-230加入量的关系,并探讨了该材料的微观断裂形貌与韧性的关系。力学测试结果显示室温断裂延伸率、室温和低温冲击韧性随D-230含量的增加而增加,表明D-230对环氧树脂产生有效的增韧作用。当D-230加入量为21%(质量分数)时,室温拉伸强度和弹性模量最大,分别为85.44MPa和3.22GPa,当继续增加D-230的含量时,二者则呈降低的趋势。对拉伸断面形貌进行扫描电子显微(SEM)分析显示,随着D-230含量的增加,断口形貌越粗糙,表明抗开裂能力增加,这与高断裂延伸率和高冲击韧性的结果一致。热分析实验结果显示,体系的玻璃化温度(Tg)随着D-230含量的增加而降低。

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