Bio-based triblock copolymers from natural rubber and poly(lactic acid): Synthesis and application in polymer blending

被引：51
作者：
Chumeka, Wannapa [1 ,2 ]
Pasetto, Pamela [2 ]
Pilard, Jean-Francois [2 ]
Tanrattanakul, Varaporn [1 ]
机构：
[1] Prince Songkla Univ, Fac Sci, Dept Mat Sci & Technol, Bioplast Res Unit, Hat Yai 90112, Thailand
[2] Univ Maine, Inst Mol & Mat Mans, UMR CNRS 6283, F-72085 Le Mans, France
来源：
POLYMER | 2014年 / 55卷 / 17期
关键词：
Bio-based triblock copolymer; Natural rubber; Poly(lactic acid); BLOCK-COPOLYMERS; LACTIC-ACID; DEGRADATION; POLYURETHANE; COMPATIBILIZER;
D O I：
10.1016/j.polymer.2014.06.091
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
This work involved the development of a synthetic method to produce a novel bio-based triblock copolymer (PLA-NR-PLA) that consisted of poly(lactic acid) and natural rubber. The H-1 NMR analysis showed the presence of new ester linkages that resulted from a reaction between the carboxyl endgroups of the PLA prepolymer and the hydroxyl end-groups of the HTNR, together with the characteristics of the PLA endblock and the HTNR midblock. The M-n of PLA-NR-PLA as determined from the GPC agreed with that from the calculation. The DSC and TGA results also substantiated the formation of a block copolymer. PLA-NR-PLA acted as a toughening agent for PLA and as a compatibilizer in the PLA/NR blend. The PLA-NR-PLA was as good as a toughening agent as NR although the PLA-NR-PLA had a much lower molecular weight than the NR. The compatibilization effect was more dominant in the blend containing 10% rubber than in the blend that contained >10% rubber. The compatibilization effect was also observed in the morphology of the blend as a reduction in the rubber particle diameter. PLA-NR-PLA not only increased the impact strength of the blends, but also increased the elongation at break. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：4478 / 4487
页数：10
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