Mechanical properties, morphology, and crystallization behavior of blends of poly(L-lactide) with poly(butylene succinate-co-L-lactate) and poly(butylene succinate)
Mechanical properties, morphology, and crystallization behavior of blends of poly(L-lactide) with poly(butylene succinate-co-L-lactate) and poly(butylene succinate)
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DOI：
10.1016/j.polymer.2006.03.065
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发表时间：
2006-05-03
期刊：
影响因子：
4.6
通讯作者：
Miyoshi, M
中科院分区：
文献类型：
--
作者：
Shibata, M;Inoue, Y;Miyoshi, M
研究了聚L-乳酸（PLLA）与聚丁二酸丁二醇酯（PBS）和含乳酸酯单元的聚丁二酸丁二醇酯-L-乳酸共聚物（PBSL）的共混物。通过熔融混合和随后的注射成型制备了3mol%的共混物，并对它们的力学性能、形态和结晶行为进行了比较。共混物的动态粘弹性和SEM测量表明，PBSL和PBS与PLLA的相容性程度几乎相同，并且在具有低含量的PBSL或PBS（5- 20wt%）的共混物中，PBSL和PBS组分均匀分散为0.1-0.4 μ m颗粒。共混物的拉伸强度和模量在整个组成范围内基本遵循混合物的规律，但PLLA/PBS 99/1共混物的拉伸强度和模量高于纯PLLA。所有共混物显示出比纯PLLA、PBSL和PBS显著更高的断裂伸长率。共混物的差示扫描量热分析表明，PLLA组分的等温和非等温结晶的促进通过添加少量的PBSL，而添加PBS是有效得多。(c)2006爱思唯尔有限公司版权所有。
The blends of poly(L-lactide) (PLLA) with poly(butylene succinate) (PBS) and poly(butylene succinate-CO-L-lactate) (PBSL) containing the lactate unit of ca. 3 mol% were prepared by melt-mixing and subsequent injection molding, and their mechanical properties, morphology, and crystallization behavior have been compared. Dynamic viscoelasticity and SEM measurements of the blends revealed that the extent of the compatibility of PBSL and PBS with PLLA is almost the same, and that the PBSL and PBS components in the blends with a low content of PBSL or PBS (5-20 wt%) are homogenously dispersed as 0.1-0.4 mu m particles. The tensile strength and modulus of the blends approximately followed the rule of mixtures over the whole composition range except that those of PLLA/PBS 99/1 blend were exceptionally higher than those of pure PLLA. All the blends showed considerably higher elongation at break than pure PLLA, PBSL, and PBS. Differential scanning calorimetric analysis of the blends revealed that the isothermal and non-isothermal crystallization of the PLLA component is promoted by the addition of a small amount of PBSL, while the addition of PBS was much less effective. (c) 2006 Elsevier Ltd. All rights reserved.