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首页> 外文期刊>Journal of Applied Polymer Science >Bio-Based Diblock Copolymers Prepared from Poly(lactic acid) and Natural Rubber
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Bio-Based Diblock Copolymers Prepared from Poly(lactic acid) and Natural Rubber

机译：由聚乳酸和天然橡胶制备的生物基二嵌段共聚物

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New bio-based diblock copolymers were synthesized from poly(lactic acid) (PLA) and natural rubber (NR). NR polymer chains were modified to obtain hydroxyl telechelic natural rubber oligomers (HTNR). Condensation polymerization between PLA and HTNR was performed at 110 degrees C during 24 or 48 h. The molecular weight of PLA and HTNR and the molar ratio PLA : HTNR were varied. The new ester linkage in the diblock copolymers was determined by H-1-NMR. The molecular weight of the diblock copolymers determined from SEC agreed with that expected from calculation. The thermal behavior and degradation temperature were determined by DSC and TGA, respectively. The diblock copolymers were used as a toughening agent of PLA and as a compatibilizer of the PLA/NR blend. PLA blended with the diblock copolymer showed higher impact strength, which was comparable to the one of a PLA/NR blend. The former blend showed smaller dispersed particles as showed by SEM images, indicating the increase in miscibility in the blend due to the PLA block. The compatibilization was effective in the blends containing similar to 10 wt % of rubber. At a higher rubber content (>10 wt %), coalescence of the NR and diblock copolymer was responsible of the larger rubber diameter in the blends, which causes a decrease of the impact strength. (C) 2014 Wiley Periodicals, Inc.
机译：由聚乳酸（PLA）和天然橡胶（NR）合成了新的生物基二嵌段共聚物。 NR聚合物链进行了改性，以获得羟基远螯天然橡胶低聚物（HTNR）。 PLA和HTNR之间的缩聚反应是在110摄氏度下进行24或48小时。 PLA和HTNR的分子量以及PLA∶HTNR的摩尔比是变化的。通过H-1-NMR确定二嵌段共聚物中的新酯键。由SEC确定的二嵌段共聚物的分子量与计算预期的一致。热行为和降解温度分别通过DSC和TGA确定。二嵌段共聚物用作PLA的增韧剂和PLA / NR共混物的增容剂。与二嵌段共聚物共混的PLA显示出更高的冲击强度，与PLA / NR共混物中的一种相当。如SEM图像所示，前一种共混物显示出较小的分散颗粒，表明由于PLA嵌段，共混物中混溶性增加。相容性在包含约10重量％的橡胶的共混物中是有效的。在较高的橡胶含量（> 10 wt％）下，NR和二嵌段共聚物的聚结是共混物中较大的橡胶直径的原因，这导致冲击强度降低。 （C）2014威利期刊公司

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