聚丙烯酸酯微球的制备及其增韧聚乳酸的研究  

Preparation of Polyacrylate Microsphere and Its Application in Toughening of Polylactic Acid

作　　者：宋晓丽[1,2,3,4] 陈莹[1,2,3,4] 许玉芝[1,2,3,4] 王春鹏[1,2,3,4,5] 

机构地区：[1]中国林业科学研究院林产化学工业研究所 [2]生物质化学利用国家工程实验室 [3]国家林业局林产化学工程重点开放性实验室 [4]江苏省生物质能源与材料重点实验室,江苏南京210042 [5]中国林业科学研究院林业新技术研究所,北京100091

出　　处：《林产化学与工业》2014年第3期60-64,共5页Chemistry and Industry of Forest Products

基　　金：国家国际科技合作专项项目(2011DFA32440);国家自然科学基金资助项目(31200448)

摘　　要：采用预乳化-半连续种子乳液聚合法,以丙烯酸丁酯(BA)和甲基丙烯酸甲酯(MMA)为主要单体(核层单体BA与MMA的质量比为9∶1;壳层单体BA与MMA的质量比为1∶9)合成了不同核层交联程度的聚丙烯酸酯微球(ACR),将其干燥后对聚乳酸(PLA)改性。研究了核壳型ACR的添加量及其核层交联程度对PLA力学性能的影响。结果表明,PLA的抗冲击强度随着ACR添加量的增加而增大,添加量为10%时增韧效果最好,抗冲击强度是纯的PLA的1.5倍,断裂伸长率由2%提高到11%,拉伸强度下降不大;随着核层交联剂用量的增加,PLA/ACR共混物的拉伸强度较纯的PLA下降很小,抗冲击强度明显升高,当核层交联剂添加量为4%时增韧效果最好,共混物的抗冲击强度是纯的PLA的3倍,拉伸强度仅下降了7%。Polyacrylate microspheres with different cross-linking degrees of core were prepared by semi-continuous seed emulsion copolymerization using butyl acrylate（ BA） and methyl methacrylate （ MMA） as main monomers. The mass ratios of BA and MMA in core and in shell were 9：1 and 1：9 respectively. The synthesized polyacrylate microspheres were then dried and used to toughen polylactic acid （ PLA） . The effect of content and cross-linking degree of core of polyacrylate microsphere （ ACR） with core-shell structure on mechanical properties of PLA were studied. The results showed that the impact strength of PLA was increased with the increase of ACR content. It was found that when the ACR cotent was 10%, the impact strength of the blend was about 1. 5 times as large as the pure PLA. The elongation at break was increased from 2% to 11%, whereas the tensile strength loss of PLA had little change, when it was compared with that of non-toughened PLA. It was also observed that the tensile strength loss of PLA decreased slightly as the increase of cross-linking degree of core, while the impact strength increased obviously. When the cross-linking degree of core was 4%, the impact strength increased about 2 times larger than that of non-toughened PLA and tensile strength was only decreased by 7%. Therefore, 10% of ACR content and 4% of cross-linking degree of core were considered as the optimal ratio for good toughening of PLA.

关 键 词：聚丙烯酸酯 聚乳酸 增韧 

分 类 号：TQ35[化学工程]