Water-soluble and environmentally friendly polyvinyl alcohol/straw aerogel for sustainable packaging

IF 5.6 1区 农林科学 Q1 AGRICULTURAL ENGINEERING Industrial Crops and Products Pub Date : 2024-10-29 DOI:10.1016/j.indcrop.2024.119895
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Abstract

The packaging industry is transitioning towards sustainability in response to growing environmental concerns and evolving consumer expectations. While biodegradable packaging offers promise, issues such as potential microplastics and uncontrolled degradation hinder its widespread adoption as a perfect solution. Leveraging the water solubility of polyvinyl alcohol (PVA) and agricultural and forestry waste, i.e. straw, we demonstrated a PVA/gelatin/straw aerogel using ice-templating freeze-drying and solid state shear milling (S3M) technologies for packaging. The increased porosity of the aerogel enhances specific surface area of PVA, facilitating better interaction with the environment. Furthermore, the inclusion of biomass fillers reduces the phase domain size of PVA, improving water solubility. Gelatin further refines the pore structure, enhancing mechanical properties by providing physical crosslinking points. With an optimized composition, the aerogel achieves a compressive modulus of 0.96 MPa, meeting the strength criteria for polystyrene foam packaging according to QB/T 1649–1992 standards. Importantly, both the aerogel and its aqueous solution demonstrate non-toxicity and environmental friendliness. This study not only presents a series of eco-friendly aerogels but also explores novel applications for PVA in environmentally sustainable packaging.
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用于可持续包装的水溶性环保型聚乙烯醇/秸秆气凝胶
为了应对日益增长的环境问题和不断变化的消费者期望,包装行业正在向可持续发展方向转型。虽然生物降解包装前景广阔,但潜在的微塑料和不受控制的降解等问题阻碍了其作为完美解决方案的广泛应用。利用聚乙烯醇(PVA)和农林废弃物(即秸秆)的水溶性,我们利用冰--模板冷冻干燥和固态剪切研磨(S3M)技术展示了一种用于包装的 PVA/明胶/秸秆气凝胶。气凝胶孔隙率的增加提高了 PVA 的比表面积,有利于更好地与环境互动。此外,生物质填料的加入降低了 PVA 的相域尺寸,提高了水溶性。明胶进一步细化了孔隙结构,通过提供物理交联点增强了机械性能。经过优化组合后,气凝胶的压缩模量达到 0.96 兆帕,符合 QB/T 1649-1992 聚苯乙烯泡沫包装的强度标准。重要的是,气凝胶及其水溶液都表现出无毒性和环保性。这项研究不仅展示了一系列环保型气凝胶,还探索了 PVA 在环境可持续包装中的新应用。
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来源期刊
Industrial Crops and Products
Industrial Crops and Products 农林科学-农业工程
CiteScore
9.50
自引率
8.50%
发文量
1518
审稿时长
43 days
期刊介绍: Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.
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