Coalescence in PLA-PBAT blends under shear flow: Effects of blend preparation and PLA molecular weight

材料科学 聚结(物理) 流变学 粘弹性 复合材料 剪切(物理) 剪切速率 挤压 聚合物混合物 扫描电子显微镜 化学工程 聚合物 共聚物 天体生物学 物理 工程类
作者
Mohammadreza Nofar,Marie-Claude Heuzey,Pierre J. Carreau,Musa R. Kamal,Jed Randall
出处
期刊:Journal of Rheology [American Institute of Physics]
卷期号:60 (4): 637-648 被引量:68
标识
DOI:10.1122/1.4953446
摘要

Blends containing 75 wt. % of an amorphous polylactide (PLA) with two different molecular weights and 25 wt. % of a poly[(butylene adipate)-co-terephthalate] (PBAT) were prepared using either a Brabender batch mixer or a twin-screw extruder. These compounds were selected because blending PLA with PBAT can overcome various drawbacks of PLA such as its brittleness and processability limitations. In this study, we investigated the effects of varying the molecular weight of the PLA matrix and of two different mixing processes on the blend morphology and, further, on droplet coalescence during shearing. The rheological properties of these blends were investigated and the interfacial properties were analyzed using the Palierne emulsion model. Droplet coalescence was investigated by applying shear flows of 0.05 and 0.20 s−1 at a fixed strain of 60. Subsequently, small amplitude oscillatory shear tests were conducted to investigate changes in the viscoelastic properties. The morphology of the blends was also examined using scanning electron microscope (SEM) micrographs. It was observed that the PBAT droplets were much smaller when twin-screw extrusion was used for the blend preparation. Shearing at 0.05 s−1 induced significant droplet coalescence in all blends, but coalescence and changes in the viscoelastic properties were much more pronounced for the PLA-PBAT blend based on a lower molecular weight PLA. The viscoelastic responses were also somehow affected by the thermal degradation of the PLA matrix during the experiments.

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