CAJ | 학술논문

研究了不同含量的丁二醇-己二酸-对苯二甲酸共聚酯(PBAT)与聚丁二酸丁二醇酯(PBS)增韧聚乳酸(PLA)的二元共混体系以及添加 LAK 粒子(硫酸盐)的三元共混体系拉伸性能、微观结构以及结晶行为,并利用 Avrami 方程对结晶过程进行了模拟。结果表明,PBAT 与 PBS 的添加都不同程度地改善了PLA 的断裂伸长率,在拉伸强度下降较小的前提下大幅度提高了其韧性；LAK 粒子能进一步提高 PLA-10％PBS 二元体系的断裂伸长率；拉伸破坏试样断面的 SEM 照片表明,两种聚合物界面处以及 PLA 和粒子之间在外力作用下形成的空洞化是共混体系韧性提高的主要原因；PBAT 与 PBS 的添加均促进了 PLA的结晶,PBS 还引起了 PLA 晶型的转变；LAK 粒子能够起到成核剂的作用,进一步缩短了两种增韧剂体系的半结晶时间；添加 LAK 粒子的增韧体系的 Avrami方程拟合曲线平行,其成核方式及生长过程相似。
연구료불동함량적정이순-기이산-대분이갑산공취지(PBAT)여취정이산정이순지(PBS)증인취유산(PLA)적이원공혼체계이급첨가 LAK 입자(류산염)적삼원공혼체계랍신성능、미관결구이급결정행위,병이용 Avrami 방정대결정과정진행료모의。결과표명,PBAT 여 PBS 적첨가도불동정도지개선료PLA 적단렬신장솔,재랍신강도하강교소적전제하대폭도제고료기인성；LAK 입자능진일보제고 PLA-10％PBS 이원체계적단렬신장솔；랍신파배시양단면적 SEM 조편표명,량충취합물계면처이급 PLA 화입자지간재외력작용하형성적공동화시공혼체계인성제고적주요원인；PBAT 여 PBS 적첨가균촉진료 PLA적결정,PBS 환인기료 PLA 정형적전변；LAK 입자능구기도성핵제적작용,진일보축단료량충증인제체계적반결정시간；첨가 LAK 입자적증인체계적 Avrami방정의합곡선평행,기성핵방식급생장과정상사。
The tensile properties,micro-structure and crystallization behavior of polylactide binary composites with butylene glycol - adipic acid - ternary terephthalate polyester (PBAT)or polybutylene succinate (PBS)and their ternary composites with further addition of rigid filler LAK (sulfate ingredient)were investigated in this work.The mechanical study indicated that the addition of PBAT or PBS resulted in great improvement of the elongation at break and enhanced the poor toughness of PLA.The addition of LAK particles into 10wt% PLA-PBS system also resulted in the improvement of its elongation at break.The morphology study of PLA tensile fracture surface by SEM indicated the dominated deformation mechanism of toughened PLA blends was attribu-ted to the cavitation formation from the interface between PLA and the second polymer or the rigid particles. Both the addition of PBAT and PBS promoted the crystallization behavior of PLA,and the addition of PBS also resulted in the different type of PLA crystalline.LAK particles acted as nucleating agents in the PLA ternary composites and further decreased the half-crystallization time.Based on the parameters calculated by Avrami equation,the addition of LAK particles into both PLA-PBAT and PLA-PBS system have the similar crystal nu-cleating and growth process.