Effect of polycaprolactone-co-polylactide copolyesters' arms in enhancing optical transparent PLA toughness

被引：17
作者：
Choochottiros, Chantiga [1 ]
机构：
[1] Kasetsart Univ, Dept Mat Sci, Fac Sci, Bangkok 10900, Thailand
来源：
MACROMOLECULAR RESEARCH | 2016年 / 24卷 / 09期
关键词：
polycaprolactone; polylactide; star-shaped polyester; toughness; optical transparency; POLY(LACTIC ACID); IMPACT MODIFIERS; COPOLYMERS; POLY(L-LACTIDE);
D O I：
10.1007/s13233-016-4118-1
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Considering enhanced toughness of polylactic acid (PLA) including retaining its optical transparency, star-shaped copolyester was investigated. The star-shaped polycaprolactone-co-polylactide (stPCL-co-PLA) with a different number of arms was synthesized using star-shaped initiators. The thermal properties and crystallinity of stPCL-co-PLA were independent to the number of arms of the polymer. However, number of arms of stPCL-co-PLA affected to crystallinity of PLA in the blend of PLA/stPCL-co-PLA. The glass transition temperature of the blend was decreased with the addition of stPCL-co-PLA plasticizers. The stPCL-co-PLA with 2-arms and 4-arms provided increasing of crystallinity of PLA in the blends but 3-arms resulted in decreasing of crystallinity due to their steric hindrance. Moreover, the toughness of PLA was enhanced with mixed stPCL-co-PLA up to 3 phr; for example, 4-arms of stPCL-co-PLA provided increasing of toughness as 61% compared to neat PLA. The results revealed that an improvement in toughness might be obtained from shear-yielding deformation which was provided from rubbertoughened amorphous plastics accompanied with extensive orientation of the semicrystalline portion. Moreover, it was found that at 3 phr of stPCL-co-PLA, the compound retained its optical transparency comparable to neat PLA.
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收藏
页码：838 / 846
页数：9
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