摘要
对聚乳酸进行植物纤维复合改性和γ射线辐照交联,能够提高其强度和韧性,然而γ辐照交联改性对复合材料降解性能的影响不明确。通过扫描电镜(SEM)测试、称量质量、差示扫描量热(DSC)测试、力学性能测试等,对比未交联复合材料和交联复合材料降解前后的表面形貌、失重率、结晶行为、力学性能等变化。结果表明:未交联复合材料比交联复合材料出现更多的孔洞、沟槽,表面更粗糙,降解更严重;未交联复合材料的失重率均高于交联复合材料。交联、未交联复合材料降解100 d后,玻璃化转变温度(Tg)分别为52.8℃、47.51℃,熔融温度(Tm)分别为149.29℃、148.31℃,结晶度分别为23.0%、54.0%,未交联复合材料因降解造成的链断裂更严重。降解40 d后交联复合材料的拉伸、冲击、弯曲强度和断裂伸长率均高于未交联复合材料,交联在一定程度上延缓了降解进程。
The strength and toughness of polylactic acid can be improved by plant fiber composite modification and γ-ray irradiation crosslinking.However,the effect of γ-irradiation crosslinking modification on the degradation performance of composites is not clear.The surface morphology,weight loss rate,crystallization behavior and mechanical properties of uncrosslinked samples and cross-linked samples before and after degradation were compared by scanning electron microscopy(SEM) test,weighing mass,differential scanning calorimetry(DSC) test and mechanical properties test.The results show that the uncrosslinked samples have more holes and grooves,rougher surface and more serious degradation than the cross-linked samples.The weight loss rate of uncrosslinked samples is higher than that of crosslinked samples.After 100 d of degradation,the glass transition temperature(Tg) of crosslinked and uncrosslinked samples are 52.8 ℃ and 47.51 ℃,melting temperature(Tm) are 149.29 ℃ and 148.31 ℃,and crystallinity are 23.0% and 54.0%,respectively.The chain break caused by degradation of uncrosslinked samples is more serious.After 40 d of degradation,the tensile,impact,bending strength and elongation at break of the crosslinked samples are higher than those of the uncrosslinked samples,and the crosslinking delayes the degradation process to a certain extent.
作者
夏学莲
史向阳
赵海鹏
周鹏飞
侯淑霞
毛艳丽
陈兴华
XIA Xue-lian;SHI Xiang-yang;ZHAO Hai-peng;ZHOU Peng-fei;HOU Shu-xia;MAO Yan-li;CHEN Xing-hua(Henan University of Urban Construction,Pingdingshan 467036,China;Henan Shenma Nylon Chemical Co.,Ltd.,Pingdingshan 467013,China;Henan Tuoren Medical Equipment Research Institute Co.,Ltd.,Xinxiang 453400,China;Pingdingshan Huaxing Flotation Engineering Technology Service Co.,Ltd.,Pingdingshan 467000,China)
出处
《塑料科技》
CAS
北大核心
2023年第7期62-67,共6页
Plastics Science and Technology
基金
河南省科技厅科技攻关项目(232102230143)
河南省科技厅科技攻关项目(222102230028)
平顶山市重大科技专项项目(2020ZD05)
河南省高等学校重点科研项目(22B430008)
平顶山市引进培育创新创业高端人才(团队)项目。
关键词
聚乳酸
辐照交联
降解性能
Polylactic acid
Irradiation crosslinking
Degradation performance
