Manipulating Crystallization for Simultaneous Improvement of Impact Strength and Heat Resistance of Plasticized Poly(l-lactic acid) and Poly(butylene succinate) Blends

被引:11
作者
Kajornprai, Todsapol [1 ]
Suttiruengwong, Supakij [2 ]
Sirisinha, Kalyanee [1 ]
机构
[1] Mahidol Univ, Fac Sci, Dept Chem, Bangkok 10400, Thailand
[2] Silpakorn Univ, Fac Engn & Ind Technol, Dept Mat Sci & Engn, Sanamchandra Palace Campus, Amphoe Muang 73000, Nakhon Pathom, Thailand
关键词
poly(lactic acid); poly(butylene succinate); impact strength; annealing; crystallization; heat resistance; TOUGHENING MODIFICATION; MECHANICAL-PROPERTIES; PLLA/PBS BLENDS; TOUGHNESS; BEHAVIOR; MORPHOLOGY; PLA; CRYSTALLINITY; COPOLYMERS; POLYMERS;
D O I
10.3390/polym13183066
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Crystalline morphology and phase structure play a decisive role in determining the properties of polymer blends. In this research, biodegradable blends of poly(l-lactic acid) (PLLA) and poly(butylene succinate) (PBS) have been prepared by melt-extrusion and molded into specimens with rapid cooling. The crystalline morphology (e.g., crystallinity, crystal type and perfection) is manipulated by annealing the molded products from solid-state within a short time. This work emphasizes on the effects of annealing conditions on crystallization and properties of the blends, especially impact toughness and thermal stability. Phase-separation morphology with PBS dispersed particles smaller than 1 mu m is created in the blends. The blend properties are successfully dictated by controlling the crystalline morphology. Increasing crystallinity alone does not ensure the enhancement of impact toughness. A great improvement of impact strength and heat resistance is achieved when the PLLA/PBS (80/20) blends are plasticized with 5% medium molecular-weight poly(ethylene glycol), and simultaneously heat-treated at a temperature close to the cold-crystallization of PLLA. The plasticized blend annealed at 92 degrees C for only 10 min exhibits ten-fold impact strength over the starting PLLA and slightly higher heat distortion temperature. The microscopic study demonstrates the fracture mechanism changes from crazing to shear yielding in this annealed sample.
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页数:14
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