【作者】 陈晓蕾； 黄洪亮； 石建高； 刘永利； 史航； 王鲁民；

【Author】 CHEN Xiao-lei,HUANG Hong-liang,SHI Jian-gao,LIU Yong-li,SHI Hang,WANG Lu-ming, (East China Sea Fisheries Research Institute,Key and Open Laboratory of Marine and Estuarine Fisheries,Ministry of Agriculture,Shanghai 200090,China)

【机构】 中国水产科学研究院东海水产研究所农业部海洋与河口渔业重点开放实验室；

【摘要】 研究聚乳酸/淀粉复合材料在海水环境中历经8个月的可降解性能。对每个月取样样品的降解性能通过凝胶渗透色谱仪(GPC)、热重(TG)和力学性能进行评价,并对试样的形貌采用扫描电镜(SEM)进行观察。实验结果表明:随着在海水中降解时间的增加,样品分子量和分子量分布均逐渐减小,材料的热稳定性和冲击强度均逐渐下降,而材料的拉伸强度和断裂伸长率由于水分子的增塑作用均出现先减小后增大再减小的趋势。SEM照片显示随着降解时间的增加,材料内部逐渐出现空洞,结构变得松散。分析表明样品在海水中具有良好的降解性。更多还原

【Abstract】 Degradability of poly(lactic-acid)(PLA)/starch composite in seawater environment for 8 months was studied.The degradation of samples was estimated by gel permeation chromatography(GPC), thermogravimetry(TG) and mechanical property.The microstructure of samples was observed through SEM. The results indicate that the values of molecular weight and it’s distribution of composites were both decreased with the increase in time of immersed in seawater,meanwhile thermal stability and impact strength of samples were both decreased,but tensile strength and elongation at break were first decreased, then increased and at last decreased again.SEM photographs showed void and looseness of structure appeared in the samples with the increase in time of immersed in seawater.The analysis showed PLA/starch composite in seawater had good degradability.更多还原