摘要
通过熔融法制备热塑性聚氨酯(TPU)/不同VA含量的乙烯-醋酸乙烯酯共聚物(EVA)共混物,并采用乙烯-醋酸乙烯酯共聚物接枝马来酸酐(EVA-g-MAH)改善二者的相容性;采用红外光谱(FTIR)、扫描电子显微镜(SEM)、接触角测试仪和力学性能测试等表征所得复合材料的微观结构和性能。研究结果表明:EVA40与TPU的界面张力更低;TPU/EVA共混物的弹性模量随着EVA含量的增加而升高,最高可达到TPU的8.5倍;TPU与VA质量分数为15%的EVA制备的共混物力学性能更好;EVA显著提高了TPU的形状固定率(Rf),而形状恢复率(Rr)略有降低;综合共混物的力学和形状记忆性能,TPU与EVA(VA质量分数为15%)的最佳配比为70:30;EVA-g-MAH提高了TPU与EVA的相容性;加入EVA-g-MAH后,共混物的力学性能和Rf明显提高,但Rr明显降低。
The thermoplastic polyurethane(TPU)/ethylene-vinyl acetate copolymer(EVA)blends with different VA contents were prepared by the melting method,and the ethylene-vinyl acetate copolymer grafted with maleic anhydride(EVA-g-MAH)was used to improve the compatibility of the both.Infrared spectroscopy(FTIR),scanning electron microscope(SEM),contact angle tester and mechanical properties test were used to characterize the microstructure and properties of the obtained composite materials.The research results show that the interfacial tension of EVA40 and TPU is lower.The elastic modulus of TPU/EVA blend increases with the increase of EVA content,which can reach up to 8.5 times of TPU.When the mass fraction of TPU and VA is 15%,the mechanical properties of blends prepared by EVA are better.EVA significantly improves the shape fixation rate(Rf)of TPU,while the shape recovery rate(Rr)decreases slightly.As for the mechanical and shape memory properties of the blend,the optimal ratio of TPU and EVA is 70:30 when VA mass fraction is 15%;EVA-g-MAH improves the compatibility of TPU and EVA;after adding EVA-g-MAH,the mechanical properties and Rf of the blend are significantly improved,but Rr is significantly reduced.
作者
卞军
郭怡
黄娇
严磊
梁嘉
杨丽菲
陈林
黄欢
蔺海兰
BIAN Jun;GUO Yi;HUANG Jiao;YAN Lei;LIANG Jia;YANG Lifei;CHEN Lin;HUANG Huan;LIN Hailan(School of Materials and Engineering,Xihua University,Chengdu 610039 China)
出处
《西华大学学报（自然科学版）》
CAS
2020年第3期14-21,共8页
Journal of Xihua University:Natural Science Edition
基金
教育部春晖计划(Z2018088,Z2017070)
西华大学大健康管理促进中心开放课题基金(DJKG2019-002)
西华大学“西华杯”大学生创新创业训练项目(自然科学类)(2020133)
创新创业环境下“大材料学科”专业综合改革与建设实践教学团队项目(05050028)
西华大学界面创新研究工作室建设项目(2019-07)。
