Miscibility, mechanical and thermal properties of poly(lactic acid)/polyester-diol blends
Miscibility, mechanical and thermal properties of poly(lactic acid)/polyester-diol blends
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DOI：
10.1016/j.eurpolymj.2009.05.011
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发表时间：
2009-08-01
影响因子：
6
通讯作者：
Yamaguchi, Masayuki
中科院分区：
文献类型：
--
作者：
Okamoto, Kenzo;Ichikawa, Tomokazu;Yamaguchi, Masayuki
我们发现了聚乳酸 (PLA) 具有高分子量和低流动性的新型增塑剂。新型增塑剂是标称分子量为 2000 的聚酯二醇 (PED)。测量了固态 PLA/PED 共混物的振荡拉伸模量的温度依赖性，并发现了共混物的可混溶对。可混溶的对是 PLA/聚己二酸乙二醇酯和 PLA/聚己二酸二乙二醇酯。扫描电镜观察和差示扫描量热法结果也表明，这些共混物与PLA在PED重量比小于或等于20%时可互溶。在这些共混物中，玻璃化转变温度显着低于PLA。另一方面，聚己二酸丁二醇酯和聚己二酸己二酸六亚甲基酯在PED 20%的重量比下与PLA部分混溶。从溶解度参数的角度讨论了混溶性的差异，溶解度参数是用小熵和构型熵的方法计算的。 (C) 2009 Elsevier Ltd. 保留所有权利。
We found new plasticizers with high molecular weight and low mobility for poly(lactic acid) (PLA). The new plasticizers are polyester-diols (PED) with nominal molecular weight 2000. Temperature dependence of oscillatory tensile moduli of PLA/PED blends in solid states was measured and miscible pairs of the blends were found. The miscible pairs are PLA/poly(ethylene adipate) and PLA/poly(diethylene adipate). Observation by scanning electron microscope and results of differential scanning calorimetry also indicate that these blends are miscible with PLA at weight ratio of PED less than or equal to 20%. In these blends, glass transition temperature is significantly lower than that of PLA On the other hand, poly(butylene adipate) and poly(hexamethylene adipate) are partially miscible with PLA at weight ratio of PED 20%. The difference of the miscibility is discussed in terms of solubility parameter, which is calculated using the method by Small and configurational entropy. (C) 2009 Elsevier Ltd. All rights reserved.