Hybrid Biocomposites Based on Poly(Lactic Acid) and Silica Aerogel for Food Packaging Applications

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ID: 267757
2020
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Abstract
Bionanocomposites based on poly (lactic acid) (PLA) and silica aerogel (SiA) were developed by means of melt extrusion process. PLA-SiA composite films were plasticized with 15 wt.% of acetyl (tributyl citrate) (ATBC) to facilitate the PLA processability as well as to attain flexible polymeric formulations for films for food packaging purposes. Meanwhile, SiA was added in four different proportions (0.5, 1, 3 and 5 wt.%) to evaluate the ability of SiA to improve the thermal, mechanical, and barrier performance of the bionanocomposites. The mechanical performance, thermal stability as well as the barrier properties against different gases (carbon dioxide, nitrogen, and oxygen) of the bionanocomposites were evaluated. It was observed that the addition of 3 wt.% of SiA to the plasticized PLA-ATBC matrix showed simultaneously an improvement on the thermal stability as well as the mechanical and barrier performance of films. Finally, PLA-SiA film formulations were disintegrated in compost at the lab-scale level. The combination of ATBC and SiA sped up the disintegration of PLA matrix. Thus, the bionanocomposites produced here show great potential as sustainable polymeric formulations with interest in the food packaging sector.
Bionanokomposit berbasis poli(asam laktat) (PLA) dan aerogel silika (SiA) dikembangkan melalui proses ekstrusi leleh. Film komposit PLA-SiA diplastisasi dengan 15% berat asetil (tributil sitrat) (ATBC) guna memfasilitasi kemudahan pemrosesan PLA serta memperoleh formulasi polimer yang fleksibel untuk film berkeperluan pengemasan makanan. Sementara itu, SiA ditambahkan dalam empat proporsi berbeda (0,5, 1, 3, dan 5% berat) untuk mengevaluasi kemampuan SiA dalam meningkatkan kinerja termal, mekanis, dan sawar dari bionanokomposit tersebut. Kinerja mekanis, stabilitas termal, serta sifat sawar terhadap berbagai gas (karbon dioksida, nitrogen, dan oksigen) dari bionanokomposit tersebut dievaluasi. Teramati bahwa penambahan 3% berat SiA ke dalam matriks PLA-ATBC yang terplastisasi menunjukkan peningkatan secara simultan pada stabilitas termal serta kinerja mekanis dan sawar film. Terakhir, formulasi film PLA-SiA didisintegrasi dalam kompos pada skala laboratorium. Kombinasi ATBC dan SiA mempercepat disintegrasi matriks PLA. Dengan demikian, bionanokomposit yang dihasilkan dalam penelitian ini menunjukkan potensi besar sebagai formulasi polimer berkelanjutan yang menjanjikan dalam sektor pengemasan makanan.
本研究通过熔融挤出工艺制备了基于聚乳酸（PLA）和二氧化硅气凝胶（SiA）的生物纳米复合材料。为改善PLA的加工性能并获得适用于食品包装薄膜的柔性聚合物配方，采用15 wt.%的乙酰柠檬酸三丁酯（ATBC）对PLA-SiA复合薄膜进行了增塑。同时，按四种不同比例（0.5、1、3和5 wt.%）添加SiA，以评估SiA改善生物纳米复合材料热学、力学及阻隔性能的能力。本研究系统评估了该生物纳米复合材料的力学性能、热稳定性以及对不同气体（二氧化碳、氮气和氧气）的阻隔性能。结果表明，在增塑的PLA-ATBC基体中添加3 wt.%的SiA，可同时提高薄膜的热稳定性、力学性能和阻隔性能。最后，在实验室规模下对PLA-SiA薄膜配方进行了堆肥崩解测试。ATBC与SiA的结合加速了PLA基体的崩解。因此，本研究所制备的生物纳米复合材料作为极具前景的可持续聚合物配方，在食品包装领域展现出巨大的应用潜力。
Reference Key
aragón-gutierrez2020materialshybrid Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Alejandro Aragón-Gutierrez;Marina P. Arrieta;Mar López-González;Marta Fernández-García;Daniel López;Aragón-Gutierrez, Alejandro;Arrieta, Marina P.;López-González, Mar;Fernández-García, Marta;López, Daniel;
Journal Materials (Basel, Switzerland)
Year 2020
DOI
10.3390/ma13214910
URL
https://www.mdpi.com/1996-1944/13/21/4910
Keywords
biodegradable polymers food packaging biocomposites plasticizers poly (lactic acid) citrate esters silica aerogel

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