Microcellular Foaming Behavior of PLA/PBS Blends Based on Phase Structure
YU Peng1, XIANG Pei1, GAO Jinling2, LI Yuan2
1 Hubei Provincial Key Laboratory of Green Materials for Light Industry, School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068 2 School of Automotive Engineering, Wuhan Huaxia University of Technology, Wuhan 430223
Abstract: Poly(butylenes succinate)(PBS) with various contents were added to polylactic acid(PLA) matrix to form immiscible polymer blend. Supercritical carbon dioxide microcellular foaming method was used to fabricate microcellular materials with highly interconnected cells. The visco-sity of PLA/PBS blends decreased because of the addition of PBS content, meanwhile, owing to heterogeneous nucleation effect, the cell density was increased while the cell size and cell wall thickness was decreased, which benefits to improve probability of cell wall connected. The cell structure data reveals that the smallest cell size of 9.51 μm, the largest cell density of 18.6×108 cells/cm3 and the maximum opening rate of 98.2% was obtained when foamed at 100 ℃ in blend with 20wt% PBS content. Cell opening mechanism of blend foaming samples was proposed based on PLA/PBS phase structure. Dispersion PBS phase with lower melt viscosity is stretched until it ruptured during the cell growing process, while PLA matrix with higher melt viscosity could be used as supporting skeleton to prevent cell collapse.
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2019, Vol. 33 
