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首页> 外文期刊>Journal of Polymers and the Environment >A Composting Study of Membrane-Like Polyvinyl Alcohol Based Resins and Nanocomposites
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A Composting Study of Membrane-Like Polyvinyl Alcohol Based Resins and Nanocomposites

机译：膜状聚乙烯醇基树脂和纳米复合材料的堆肥研究

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摘要

This study presents the effect of biodegradation, in a composting medium, on properties of membrane-like crosslinked and noncrosslinked polyvinyl alcohol (PVA) and nanocomposites. The composting was carried out for 120 days and the biodegradation of these materials was characterized using various techniques. The changes in the PVA resin and nanocomposite surface topography and microstructure during composting were also characterized. The results from the analyses suggest biodegradation of PVA based materials in compost medium was mainly by enzymes secreted by fungi. The results also indicate that the enzymes degraded the amorphous regions of the specimens first and that the PVA crystallinity played an important role in its biodegradation. The surface roughness of the specimens was seen to increase with composting time as the microbial colonies grew which in turn facilitated further microorganism growth. All specimens broke into small pieces between 90 and 120 days of composting as a result of deep biodegradation. Glyoxal and malonic acid crosslinking decreased the PVA biodegradation rate slightly. Addition of highly crystalline microfibrillated cellulose and naturally occurring halloysite nanotubes in PVA based nanocomposites also decreased the biodegradation rate. The three factors: PVA crystallinity, crosslinking and additives, may be utilized effectively to extend the life of these materials in real life applications.
机译：这项研究提出了堆肥培养基中生物降解对膜状交联和非交联聚乙烯醇（PVA）和纳米复合材料性能的影响。堆肥进行了120天，并使用各种技术对这些材料的生物降解进行了表征。还表征了堆肥过程中PVA树脂和纳米复合材料表面形貌及微观结构的变化。分析的结果表明，堆肥培养基中基于PVA的材料的生物降解主要是由真菌分泌的酶引起的。结果还表明，酶首先降解了样品的非晶区，并且PVA结晶度对其生物降解起了重要作用。随着微生物菌落的生长，标本的表面粗糙度随堆肥时间的增加而增加，这反过来又促进了微生物的进一步生长。由于深度生物降解，所有标本在堆肥90至120天之间会破碎成小块。乙二醛和丙二酸的交联会稍微降低PVA的生物降解率。在基于PVA的纳米复合物中添加高度结晶的微纤化纤维素和天然存在的埃洛石纳米管也降低了生物降解率。 PVA结晶度，交联性和添加剂这三个因素可以有效地延长这些材料在实际应用中的寿命。

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