摘要
为了改善聚乳酸的韧性,将硅橡胶-聚甲基丙烯酸甲酯粒子和聚乳酸通过熔融共混制备聚乳酸共混物,研究了硅橡胶-聚甲基丙烯酸甲酯粒子交联度、核壳比以及含量对于聚乳酸力学性能的影响.结果表明,当交联剂KH570用量为8％,核壳质量比为7:3时,聚乳酸共混物的抗冲击强度为2.88kJ/m2,拉伸强度为51.08MPa,增韧效果最佳;当硅丙粒子含量从0增加至18％时,PLA的抗冲击强度从1.37kJ/m2增加至8.67kJ/m2,增加了 5.33倍;拉伸强度从74.77MPa下降至38.86MPa;断裂伸长率从2.08％增加至25.45％;弯曲强度从106.64MPa下降至72.74MPa.
Abstract
In order to improve the toughness of polylactic acid(PLA),PLA blend was prepared by melting blend of silicone rubber-poly(methyl methacrylate)particles and polylactic acid.The effects of cross-linking degree,core-shell ratio and content of silicone rubber-poly(methyl methacrylate)particles on the mechanical properties of PLA were studied.The results showed that the impact strength and tensile strength of polylactic acid blend were 2.88 kJ/m2 and 51.08 MPa respectively when the amount of crosslinker KH570 was 8％and the core-shell mass ratio was 7:3.The impact strength of PLA increased 5.33 times from 1.37 kJ/m2 to 8.67 kJ/m2 when the content of silicon-C particles increased from 0 to 18％.Tensile strength decreased from 74.77 MPa to 38.86 MPa;Elongation at break increased from 2.08％to 25.45％;The bending strength decreased from 106.64MPa to 72.74 MPa.
国家科技期刊平台
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