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首页> 外文期刊>European Polymer Journal >Mechanical and morphological properties of injection molded linear and branched-polylactide (PLA) nanocomposite foams
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Mechanical and morphological properties of injection molded linear and branched-polylactide (PLA) nanocomposite foams

机译：注塑线性和支化聚乳酸（PLA）纳米复合泡沫的力学和形态学性能

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摘要

Linear and long chain branched (LCB) polylactide (PLA) clay nanocomposites were prepared via melt compounding using a twin-screw extruder. An organo-modified clay, Cloisite 30B, and a chain extender, Joncryl, were employed in this study. The resulting systems were also foamed in a conventional injection molding machine using a chemical blowing agent, namely activated azodicarbonamide. The PLA crystallinity, clay dispersion, and foam cellular morphology were characterized. Unlike the linear PLA, the addition of nanoclay markedly reduced the crystallinity of the LCB-PLA The clay inclusion as well as the LCB structure generally decreased the cell size and foam density, while increasing the cell density. The mechanical properties of the unfoamed and foamed linear and LCB-PLA samples and their corresponding nanocomposites were also characterized by tensile and Izod impact testing. The corresponding results revealed that the LCB-PLA nanocomposite with 0.5 wt% clay loading exhibited a significantly improved cellular structure in comparison with other foamed samples, leading to increased values of the specific modulus, tensile and impact strength. (C) 2015 Elsevier Ltd. All rights reserved.
机译：线性和长链支化（LCB）聚丙交酯（PLA）粘土纳米复合材料是通过使用双螺杆挤出机进行熔融混合制备的。在这项研究中使用了有机改性的粘土Cloisite 30B和增链剂Joncryl。所得的体系也使用化学发泡剂，即活化的偶氮二甲酰胺，在常规注塑机中发泡。表征了PLA的结晶度，粘土的分散性和泡沫的细胞形态。与线性PLA不同，纳米粘土的添加显着降低了LCB-PLA的结晶度。粘土包裹体以及LCB结构通常会减小孔尺寸和泡沫密度，同时增加孔密度。还通过拉伸和艾佐德冲击试验表征了未发泡和发泡的线性和LCB-PLA样品及其相应的纳米复合材料的机械性能。相应的结果表明，与其他泡沫样品相比，粘土含量为0.5 wt％的LCB-PLA纳米复合材料表现出明显改善的孔结构，从而导致比模量，拉伸强度和冲击强度的值增加。 （C）2015 Elsevier Ltd.保留所有权利。

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