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首页> 外文期刊>Environmental engineering and management journal >BIODEGRADATION BEHAVIOR OF POLY(VINYL ALCOHOL) - WOOD COMPOSITES
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BIODEGRADATION BEHAVIOR OF POLY(VINYL ALCOHOL) - WOOD COMPOSITES

机译：聚乙烯醇-木材复合材料的生物降解行为

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摘要

A study on the biodegradability of several formulations based on poly[vinyl alcohol] (PVA) and wood flour has been carried out. Basically, all formulations are based on PVA and wood flour, and the influence of starch, glycerol and/or polyvinyl chloride (PVC) incorporated in some of them was investigated. Biodegradation was performed by incubation of the composites with a selected Aspergillus niger strain able to act as an polymer biodegrading agent. The composites biodegradation was evaluated by using SEM observations, FTIR and TGA analysis before and after incubation with microorganism. The surface morphology obtained from SEM showed that fungal strain colonizes the polymer surface of samples VACW (supplemented with glycerol and PVC), and especially of samples VAA (supplemented with glycerol and starch), developing dense hyphae networks and conidia accumulations. The microbial attack on composites with more than two components has led to the increase of the peak around 1740 cm"1, due to oxidation of PVA hydroxyl groups to carbonyl groups, proving in this way the beginning of the biodegradation process. TGA analysis demonstrated that the number of thermal decomposition steps depends on composition, from three steps for VA samples (only with the two basic components, PVA and wood flour), up to four steps for VAW samples (supplemented with glycerol) and VAA samples, and even five steps for VACW. The experiments confirmed the biodegradation process of the VAA and VACW samples that are more accessible to the fungal activity.
机译：对几种基于聚乙烯醇和木粉的配方的生物降解性进行了研究。基本上，所有配方均基于PVA和木粉，并研究了其中掺入的淀粉，甘油和/或聚氯乙烯（PVC）的影响。通过将复合物与能够充当聚合物生物降解剂的选定的黑曲霉菌株一起孵育来进行生物降解。在与微生物孵育之前和之后，通过使用SEM观察，FTIR和TGA分析来评估复合材料的生物降解。从SEM得到的表面形态表明，真菌菌株在样品VACW（补充有甘油和PVC），尤其是样品VAA（补充有甘油和淀粉）的聚合物表面上定居，形成密集的菌丝网络和分生孢子积累。由于PVA羟基被氧化为羰基，微生物对具有两种以上成分的复合材料的攻击导致峰值在1740 cm-1处增加，从而证明了生物降解过程的开始。热分解步骤的数量取决于组成，从VA样品的三个步骤（仅包含两种基本成分，PVA和木粉）到VAW样品的三个步骤（补充甘油）和VAA样品，甚至五个实验证实了VAA和VACW样品的生物降解过程更易于真菌活性。

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    Luiza Jecu; Iuliana Raut; Elena Grosu; Mariana Calin; Violeta Purcar; Marius Ghiurea; Mihaela Badea-Doni; Florin Oancea; Cristian-Andi Nicolae;

  • 作者单位

    National Research and Development Institute for Chemistry and Petrochemistry - ICECHIM, Spl. Independentei 202, Bucharest, Romania;

    National Research and Development Institute for Chemistry and Petrochemistry - ICECHIM, Spl. Independentei 202, Bucharest, Romania;

    SC ICPE Bistrita SA, 7 Parcului Street, Bistrita, Romania;

    National Research and Development Institute for Chemistry and Petrochemistry - ICECHIM, Spl. Independentei 202, Bucharest, Romania;

    National Research and Development Institute for Chemistry and Petrochemistry - ICECHIM, Spl. Independentei 202, Bucharest, Romania;

    National Research and Development Institute for Chemistry and Petrochemistry - ICECHIM, Spl. Independentei 202, Bucharest, Romania;

    National Research and Development Institute for Chemistry and Petrochemistry - ICECHIM, Spl. Independentei 202, Bucharest, Romania;

    National Research and Development Institute for Chemistry and Petrochemistry - ICECHIM, Spl. Independentei 202, Bucharest, Romania;

    National Research and Development Institute for Chemistry and Petrochemistry - ICECHIM, Spl. Independentei 202, Bucharest, Romania;

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  • 正文语种 eng
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  • 关键词

    Aspergillus niger; polymer biodegradation; polyvinyl alcohol)-wood composites;

    机译：黑曲霉;聚合物生物降解;聚乙烯醇）-木材复合材料;

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