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首页> 外文期刊>Coatings >Study on Aging and Recover of Poly (Lactic) Acid Composite Films with Graphene and Carbon Nanotubes Produced by Solution Blending and Extrusion
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Study on Aging and Recover of Poly (Lactic) Acid Composite Films with Graphene and Carbon Nanotubes Produced by Solution Blending and Extrusion

机译：溶液共混挤出制备石墨烯和碳纳米管的聚乳酸复合薄膜的时效与回收率研究

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The aging, annealing, and reprocessing of the biodegradable poly (lactic) acid (PLA) based composite films incorporating graphene and carbon nanotubes were investigated in this work. Various monofiller and bifiller nanocomposite films with 6 wt.% filler content were produced by a solution-phase technique followed by extrusion. The freshly produced films were compared with the aged films after 18 months of shelf life in a room environment. The effects of aging, annealing, and melt reprocessing on the crystalline structure, the thermal stability, the hardness, and Young’s modulus were analyzed by differential scanning calorimetry (DSC), TGA, and nanoindentation methods. The fresh and the aged samples were found to have semi-crystalline materials with 3%–7% crystallinity, while the crystallinity was significantly enhanced to 34%–38% by annealing at 80 °C and subsequent slow cooling. A good dispersion was observed in the bifiller films with filler ratios of 4.5:1.5 and 1.5:4.5 [graphene nanoplatelets (GNP) to carbon nanotubes (CNT)], which affected the crystallization processes. The reprocessing at 200 °C followed by fast cooling resulted in amorphous films, which significantly reduced the hardness and Young’s modulus. The nanoindentation properties were dependent on the dispersion of nanofillers at the surfaces. The efficiency of annealing and reprocessing for the recovery and the reuse of aged nanocomposite films is discussed herein. The paper underlines that properties of the nanocomposites under investigation were influenced not only by the composition, the chemical nature of the added filler, and the processing condition, but also by the aging processes, which in turn depended on the type of nanopartcles added to PLA and the compositions. The paper provides valuable information for selection of material and processing conditions.
机译：在这项工作中，研究了掺入石墨烯和碳纳米管的可生物降解的聚乳酸（PLA）基复合膜的老化，退火和后处理。通过溶液相技术随后挤出，制备了具有6重量％的填料含量的各种单填料和双填料纳米复合膜。在室内环境下保存18个月后，将新鲜生产的胶片与老化的胶片进行比较。通过差示扫描量热法（DSC），TGA和纳米压痕方法分析了时效，退火和熔体再加工对晶体结构，热稳定性，硬度和杨氏模量的影响。发现新鲜样品和陈化样品均具有3％–7％结晶度的半结晶材料，而在80°C退火并随后缓慢冷却后，结晶度显着提高至34％–38％。在填充比为4.5：1.5和1.5：4.5的双填料薄膜中观察到良好的分散性[石墨烯纳米片（GNP）与碳纳米管（CNT）]，这影响了结晶过程。在200°C的温度下进行再处理，然后进行快速冷却，形成了非晶态膜，这大大降低了硬度和杨氏模量。纳米压痕性能取决于纳米填料在表面的分散性。本文讨论了用于老化的纳米复合膜的回收和再利用的退火和再加工的效率。该论文强调，所研究的纳米复合材料的性能不仅受组成，添加的填料的化学性质和加工条件的影响，还受老化过程的影响，而老化过程又取决于添加到PLA中的纳米颗粒的类型。和组成。本文为选择材料和加工条件提供了有价值的信息。

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