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首页> 外文期刊>Journal of Applied Polymer Science >Effects of Polymer-Grafted Natural Nanocrystals on the Structure and Mechanical Properties of Poly(lactic acid): A Case of Cellulose Whisker-graft-Polycaprolactone
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Effects of Polymer-Grafted Natural Nanocrystals on the Structure and Mechanical Properties of Poly(lactic acid): A Case of Cellulose Whisker-graft-Polycaprolactone

机译：聚合物接枝的天然纳米晶体对聚乳酸结构和力学性能的影响：以纤维素晶须接枝聚己内酯为例

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摘要

In this work, polysaccharide nanocrystals-rodlike cellulose whiskers (CWs)-were surface-grafted with polycaprolactone (PCL) via microwave-assisted ring-opening polymerization, and filaceous cellulose whisker-graft-polycaprolactone (CW-g-PCL) nanoparticles were produced. Moreover, the resultant nanoparticles were incorporated into poly(lactic acid) (PLA) as a matrix, and they showed superior function for enhancing the mechanical performance of PLA-based materials in comparison with platelet-like nanoparticles of starch nanocrystal-graft-PCL. The optimal loading level of CW-g-PCL was 8 wt %, and this resulted in simultaneous enhancements of the strength and elongation of approximately 1.9- and 10.7-fold, respectively, over those of the neat PLA material. In this case, the rigid CW nanoparticles contributed to the endurance of higher stress, whereas the grafted PCL chains improved the association between the PLA matrix and the CW-g-PCL filler and hence facilitated the transfer of stress to the rigid CW nanoparticles. Furthermore, such a fully biodegradable PLA-based nano-composite shows great potential for environmentally friendly materials because of its high mechanical performance.
机译：在这项工作中，通过微波辅助的开环聚合，将聚己内酯（PCL）表面接枝了多糖纳米晶状棒状纤维素晶须（CWs），并制备了纤维状晶须接枝聚己内酯（CW-g-PCL）纳米颗粒。此外，将所得纳米颗粒作为基质掺入聚乳酸（PLA）中，与淀粉纳米晶体接枝-PCL的片状纳米颗粒相比，它们在增强PLA基材料的机械性能方面显示出优异的功能。 CW-g-PCL的最佳负载量为8 wt％，这导致强度和伸长率分别比纯PLA材料高出约1.9倍和10.7倍。在这种情况下，刚性的CW纳米粒子有助于承受更高的应力，而接枝的PCL链则改善了PLA基质与CW-g-PCL填料之间的结合，从而促进了应力向刚性CW纳米粒子的转移。此外，这种完全可生物降解的PLA基纳米复合材料由于其较高的机械性能，显示出对环保材料的巨大潜力。

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