CAJ | 학술논문

采用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)为主要单体合成了不同玻璃化转变温度(Tg)的核壳型聚丙烯酸酯抗冲击改性剂(ACR)，将其干燥后增韧聚乳酸(PLA)，研究了ACR的核、壳两层Tg对PLA/ACR力学性能的影响。结果表明，ACR壳层Tg不变的情况下，随着核层Tg的降低，PLA/ACR共混物的缺口冲击强度先升高后降低，当核层Tg为-46℃时增韧效果最好，PLA/ACR共混物的冲击强度较纯PLA提高了3倍，拉伸性能较纯PLA下降幅度不大；ACR核层Tg不变的情况下，壳层Tg的变化对PLA/ACR共混物的力学性能影响不大。
채용반련속충자유액취합법，이병희산정지(BA)화갑기병희산갑지(MMA)위주요단체합성료불동파리화전변온도(Tg)적핵각형취병희산지항충격개성제(ACR)，장기간조후증인취유산(PLA)，연구료ACR적핵、각량층Tg대PLA/ACR역학성능적영향。결과표명，ACR각층Tg불변적정황하，수착핵층Tg적강저，PLA/ACR공혼물적결구충격강도선승고후강저，당핵층Tg위-46℃시증인효과최호，PLA/ACR공혼물적충격강도교순PLA제고료3배，랍신성능교순PLA하강폭도불대；ACR핵층Tg불변적정황하，각층Tg적변화대PLA/ACR공혼물적역학성능영향불대。
Impact modifier of polyacrylate impact modifier (ACR) with different glass transition temperature (Tg) were prepared by semi-continuous seed emulsion copolymerization using butyl acrylate (BA) and methyl methacrylate (MMA) as main monomers, which were used to toughen polylactic acid (PLA) after drying. The effect of Tg of core and shell layer of ACR on mechanical properties of PLA/ACR were studied. The results show that keeping Tg of ACR shell unchanged,the impact strength of PLA/ACR is first increased and then decreased as decreasing of Tg of core. When Tg of ACR core is-46℃,the impact strength of PLA/ACR is increased about 3 times than that of neat PLA,while tensile properties of PLA is little changed,which is the optimal one for toughening PLA. The change of Tg of shell has no influence on mechanical properties of PLA/ACR when Tg of ACR core unchanged.