CAJ | 학술논문

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%。
채용예유화-반련속충자유액취합법,이병희산정지( BA)화갑기병희산갑지( MMA)위주요단체(핵층단체BA여MMA적질량비위9：1；각층단체BA여MMA적질량비위1：9)합성료불동핵층교련정도적취병희산지미구( ACR),장기간조후대취유산( PLA)개성。연구료핵각형ACR적첨가량급기핵층교련정도대PLA역학성능적영향。결과표명,PLA적항충격강도수착ACR첨가량적증가이증대,첨가량위10%시증인효과최호,항충격강도시순적PLA적1.5배,단렬신장솔유2%제고도11%,랍신강도하강불대；수착핵층교련제용량적증가,PLA/ACR공혼물적랍신강도교순적PLA하강흔소,항충격강도명현승고,당핵층교련제첨가량위4%시증인효과최호,공혼물적항충격강도시순적PLA적3배,랍신강도부하강료7%。
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.