Poly (lactic acid) (PLA) and Linear low‐density polyethylene (LLDPE) were compounded in a corotating twin screw extruder. PE‐g‐glycidyl methacrylate was also added as a reactive compatibilizer in PLA/LLDPE blend system, which lowered interfacial tension between PLA and LLDPE. Blown films were prepared by using a single‐screw extruder for all compounded blends. The investigation of the rheological properties of a polymeric system is very important to study the processability and understand structure‐property relationship in blown films. In the present research work, the rheological properties have been investigated to assess the processability of blown films of PLA/LLDPE blends. Oscillatory shear rheology viscoelastic spectra showed an increase in the storage and loss moduli with the increase in LLDPE and compatibilizer content, which indicated pronounced viscoelastic behavior of PLA with the addition of LLDPE and compatibilizer. A steady increase in the value of extensional viscosity as a function of time was observed with the addition of LLDPE and compatibilizer in PLA. The blends with higher LLDPE content exhibited much more prominent strain hardening characteristics than those with lower LLDPE content.

中文翻译：

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聚乳酸/线性低密度聚乙烯共混物的流变特性和薄膜加工性能

将聚乳酸（PLA）和线性低密度聚乙烯（LLDPE）在同向旋转双螺杆挤出机中混合。在PLA / LLDPE共混体系中还添加了PE-g-甲基丙烯酸缩水甘油酯作为反应性增容剂，从而降低了PLA和LLDPE之间的界面张力。使用单螺杆挤出机将所有复合混合物制成吹膜。聚合物体系流变性能的研究对于研究可吹膜的可加工性和了解结构-性能关系非常重要。在当前的研究工作中，已经研究了流变性质以评估PLA / LLDPE共混物吹塑薄膜的可加工性。振荡剪切流变粘弹性谱显示，随着LLDPE和相容剂含量的增加，储能和损耗模量增加，表明在添加LLDPE和增容剂的情况下，PLA具有明显的粘弹性。通过在PLA中添加LLDPE和增容剂，可以观察到随着时间变化的拉伸粘度值稳定增加。LLDPE含量较高的共混物比LLDPE含量较低的共混物表现出更显着的应变硬化特性。