作者：Linyao Zhou, Guiyan Zhao, Wei Jiang
关键字：可生物降解, 交联, 力学性能, 聚乳酸, 淀粉
论文来源：期刊
具体来源：Journal of Applied Polymer Science, 2016, 133(2), 42297
发表时间：2016年

摘要：将玉米淀粉用环氧氯丙烷（ECH）交联并以甘油增塑，得到热塑性交联淀粉（TPCLS），再与聚乳酸（PLA）和聚醚嵌段酰胺（PEBA）熔融共混，制备了高抗冲击的可生物降解PLA/PEBA/TPCLS三元共混物。研究发现，交联剂ECH含量对三元共混物的冲击强度、拉伸性能和内部形貌具有关键影响。随着ECH含量增加，冲击强度、拉伸强度和断裂伸长率先升高，之后随ECH含量进一步增加而下降。当ECH含量为0.5 wt%时，冲击强度、拉伸强度和断裂伸长率达到最大值，同时观察到更小的salami结构粒子。这些结果归因于TPCLS剪切抵抗能力与交联淀粉和PLA-g-MA之间化学键合的竞争。

Abstract：Corn starch was crosslinked with epichlorohydrin (ECH) and then plasticized with glycerol. Subsequently, this thermoplasticized crosslinked starch (TPCLS) was melt-compounded with polylactide (PLA) and poly(ether-block-amide) (PEBA) to prepare biodegradable PLA/PEBA/TPCLS blend with high impact resistance. It was found that the crosslinking agent ECH had critical effect on the impact strength, tensile properties, and internal morphology of the ternary blend. The impact strength, tensile strength, and elongation at break increased with ECH content; thereafter, they decreased on further increasing the ECH content. At 0.5 wt% ECH content, impact strength, tensile strength, and elongation at break reached the maximum values and smaller salami structure particles were observed accordingly. These results were attributed to the competition of shear resistance of TPCLS and the chemical linkage between the crosslinked starch and PLA-g-MA.

论文链接：https://doi.org/10.1002/app.42297