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首页> 外文期刊>Journal of Applied Polymer Science >Porous poly(lactic acid) and PLA-nanocomposite structures
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Porous poly(lactic acid) and PLA-nanocomposite structures

机译：多孔聚乳酸和PLA纳米复合结构

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摘要

This article presents foaming behaviors and cellular structures of poly(lactic acid) (PLA)-clay nanocomposite and respective neat PLA foams using CO _2 as a foaming agent. The effects of nanoclay and foaming conditions on the foam morphology and mechanical properties of neat (PLA) and PLA-clay nanocomposites have been investigated by temperature modulated differential scanning calorimeter (TMDSC), X-ray diffraction, scanning electron microscopy, and tensile properties. CO _2-induced crystallization in PLA and PLA-clay nanocomposites and the crystallinity increased with an increase in saturation time. The present of clay acted as nucleation site to facilitate the crystallization process of PLA thus resulted in smaller crystallites and lower crystallinity. Unique skin-core foam morphologies in PLA and PLA-clay nanocomposites were obtained by controlling the crystallinity. Clay nanoparticles served as nucleation sites to generate foam morphology in PLA-clay sample with high crystallinity. The introduction of the cellular structure improved the mechanical strength of the material and the specific strength of PLA foams were increased in the presence of a small amount of MMT.
机译：本文介绍了使用CO _2作为发泡剂的聚乳酸（PLA）-粘土纳米复合材料和各自的纯PLA泡沫的发泡行为和孔结构。通过温度调制差示扫描量热仪（TMDSC），X射线衍射，扫描电子显微镜和拉伸性能研究了纳米粘土和发泡条件对纯净（PLA）和PLA粘土纳米复合材料的泡沫形态和力学性能的影响。 CO _2在PLA和PLA粘土纳米复合材料中诱导结晶，且结晶度随饱和时间的增加而增加。粘土的存在充当成核位置，以促进PLA的结晶过程，因此导致较小的微晶和较低的结晶度。通过控制结晶度，可得到PLA和PLA粘土纳米复合材料中独特的皮芯泡沫形态。粘土纳米颗粒充当成核位点，可在具有高结晶度的PLA粘土样品中产生泡沫形态。多孔结构的引入改善了材料的机械强度，并且在少量MMT的存在下增加了PLA泡沫的比强度。

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