Thermal, mechanical and morphological characterization of plasticized PLA-PHB blends
Thermal, mechanical and morphological characterization of plasticized PLA-PHB blends
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DOI：
10.1016/j.polymdegradstab.2012.05.036
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发表时间：
2012-09-01
影响因子：
5.9
通讯作者：
Chiellini, Emo
中科院分区：
文献类型：
--
作者：
Abdelwahab, Mohamed A.;Flynn, Allison;Chiellini, Emo
通过 TGA、DSC、XRD、SEM、机械测试和生物降解研究对聚乳酸 (PLA)（按重量计 75%）和聚（3-羟基丁酸酯）（PHB）（按重量计 25%）与两种不同浓度（每 100 份共混物中按重量计 5% 和 7%）的聚酯增塑剂 (Lapol 108) 的共混物进行了研究。 PLA/PHB 共混物显示出主要成分的良好分布并且不存在相分离。 XRD表明PLA75/PHB25共混物中PHB的原始晶体结构被扰乱。 PLA 或 PHB 与增塑剂的 DSC 曲线显示出同一个 T-g 值，表明两种主要共混物组分是可混溶的。 T-g值也随着增塑剂用量的增加而降低，并且与Fox方程表现出良好的相关性，PLA和PHB共混物的熔融温度大多不随增塑剂含量的增加而变化，并且PLA和PHB的热稳定性没有受到影响。此外，PLA/PHB 共混物的断裂伸长率随着增塑剂的添加而大大提高。此外，在天然堆肥中进行的初步生物降解研究中，纯PHB显示出一定的生物降解性，而含有PLA的样品则没有经历实质性的生物降解。最后一个方面值得以更全面、更详细的方法进一步研究。 (C) 2012 Elsevier Ltd. 保留所有权利。
A blend of poly(lactic acid) (PLA) (75% by weight) and poly(3-hydroxybutyrate) (PHB) (25% by weight) with a polyester plasticizer (Lapol 108) at two different concentrations (5 and 7% by weight per 100 parts of the blends) were investigated by TGA, DSC, XRD, SEM, mechanical testing and biodegradation studies. PLA/PHB blends showed a good distribution of the major components and absence of phase separation. XRD showed that the original crystal structure of PHB in the PLA75/PHB25 blend had been disturbed. DSC curves of PLA or PHB with plasticizer exhibited one T-g value, indicating that both major blend components are miscible. The T-g values also decreased with increased amount of plasticizer and showed good correlation to the Fox Equation, The melting temperature of PLA and PHB blends mostly did not change with an increase in plasticizer content, and the thermal stability of PLA and PHB was not affected. Also, the elongation at break of the PLA/PHB blend was greatly improved with the addition of plasticizer. In addition, in preliminary biodegradation studies carried in natural compost neat PHB showed some biodegradation, whereas the samples containing PLA did not experience a substantial biodegradation. This last aspect is worthy of further investigation in a more comprehensive and detailed approach. (C) 2012 Elsevier Ltd. All rights reserved.