摘要
为了提高聚乳酸(PLA)的韧性,采用聚丙烯酸甲酯-甲基丙烯酸甲酯(PMA-MMA)对PLA进行共混改性。采用悬浮聚合法,以丙烯酸甲酯(MA)、甲基丙烯酸甲酯(MMA)为共聚单体,制备珠粒状的PMA-MMA共聚物。通过熔融共混法,分别以PMA-MMA共聚物为增韧剂,聚乙二醇为增塑剂,聚乙烯蜡为润滑剂,对PLA进行改性,对改性后的PLA复合材料的热性能和力学性能进行研究。结果表明,随着PMA-MMA共聚物用量的增加,PLA复合材料的拉伸强度呈先增大后减小的趋势,而断裂伸长率和冲击强度不断增大。当PMA-MMA共聚物用量为15份时,PLA复合材料的拉伸强度达到最大值,为52.2 MPa;当PMA-MMA共聚物用量为25份时,PLA复合材料冲击强度为53.26 k J/m2,是纯PLA的4.4倍,断裂伸长率为54.9%。PMA-MMA共聚物与PLA的相容性好,有明显的增韧作用。PMA-MMA共聚物的加入并未降低PLA复合材料的热性能。
In order to improve the toughness of poly（lactic acid）（PLA）,polymethyl acrylate-methyl methacrylate（PMA-MMA） copolymer was used to mix with PLA. Methyl acrylate （MA） and methyl methacrylate（MMA） were used as the monomers for the preparation of PMA-MMA copolymer by means of suspention polymerization. PLA and PMA-MMA copolymer were melt-blended with polyethylene glycol（PEG） as a plasticizer and polyethylene as a lubricant. The modified PLA composites were studied by means of heat resistance and mechanical properties. The results show that with the increase of PMA-MMA copolymer content, the elongation at break and impact strength of the composites are improved,and its tensile strength increases first and then decreases. While the content of PMA-MMA copolymer is 15 phr,the tensile strength of the composite has the best tensile strength of 52.2 MPa. While the content of PMA-MMA copolymer is 25 phr,the impact strength of the composite is 53.26 kJ/m2,which is the 4.4 times of the pure PLA,and the elongation at break is 54.9%. The mechanical tests show that the mechanical properties of the composites enhance with the incorporation of PMA-MMA without decreasing heat resistance.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2015年第4期27-31,共5页
Engineering Plastics Application
基金
河北省教育厅项目(BJ201410)
唐山师范学院团队建设重点项目(2014D08)
关键词
聚乳酸
共混改性
共聚
增韧
polylactic acid
blending modification
copolymerization
toughening
