Wang Shuo, Liu Baodong, Qin Yingying, Guo Hongge
School of Light Industry Science and Engineering, Qilu University of Technology, Jinan 250353, China.
Membranes (Basel). 2021 Aug 20;11(8):640. doi: 10.3390/membranes11080640.
The polylactic acid (PLA) resin Ingeo 4032D was selected as the research object. Epoxy soybean oil (ESO) and zeolite (3A molecular sieve) were used as plasticizer and reinforcing filler, respectively, for PLA blend modification. The mixture was granulated in an extruder and then blown to obtain films under different conditions to determine the optimum processing temperatures and screw rotation. Then, the thermal behaviour, crystallinity, optical transparency, micro phase structure and physical properties of the film were investigated. The results showed that with increasing zeolite content, the crystallization behaviour of PLA changed, and the haze of the film increased from 5% to 40% compared to the pure PLA film. Zeolite and ESO dispersed in the PLA matrix played a role in toughening and strengthening. The PLA/8 wt% zeolite/3 wt% ESO film had the highest longitudinal tensile strength at 77 MPa. The PLA/2 wt% zeolite/3 wt% ESO film had the highest longitudinal elongation at 13%. The physical properties depended heavily on the dispersion of zeolite and ESO in the matrix.
选择聚乳酸（PLA）树脂Ingeo 4032D作为研究对象。分别使用环氧大豆油（ESO）和沸石（3A分子筛）作为增塑剂和增强填料对PLA进行共混改性。将混合物在挤出机中造粒，然后在不同条件下吹塑成膜，以确定最佳加工温度和螺杆转速。随后，对薄膜的热行为、结晶度、光学透明度、微观相结构和物理性能进行了研究。结果表明，随着沸石含量的增加，PLA的结晶行为发生变化，与纯PLA薄膜相比，薄膜的雾度从5%增加到40%。分散在PLA基体中的沸石和ESO起到了增韧和增强的作用。PLA/8 wt%沸石/3 wt% ESO薄膜的纵向拉伸强度最高，为77 MPa。PLA/2 wt%沸石/3 wt% ESO薄膜的纵向伸长率最高，为13%。物理性能在很大程度上取决于沸石和ESO在基体中的分散情况。
