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首页> 外文期刊>Journal of Applied Polymer Science >Effects of Crosslinking on the Mechanical Properties and Biodegradability of Soybean Protein-Based Composites
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Effects of Crosslinking on the Mechanical Properties and Biodegradability of Soybean Protein-Based Composites

机译：交联对大豆蛋白基复合材料力学性能和生物降解性的影响

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摘要

A green composite with good mechanical properties and acceptable biodegradability was developed using wood flour and soybean protein that was modified by thermal-caustic degradation and chemical crosslinking with glyoxal and polyisocyanate (PMDI). Fourier transform infrared (FTIR) spectroscopy and scanning electron microscope (SEM) in combination with the traditional evaluations were employed to investigate the structure, morphology, and properties of the crosslinked soybean protein and the crosslinking-modified wood/soybean protein composites to understand the effects of the crosslinker species on the mechanical properties, water resistance, and microbial biodegradation of soybean protein-wood flour composites. The results indicated that the chemical crosslinking modification could improve the mechanical properties and water resistance but decrease the biodegradability of the wood/protein composite to a certain extent. Both glyoxal and PMDI alone as crosslinkers could not perfectly modify the soybean protein because of the high reactivity of PMDI and low crosslinking reactivity of glyoxal. The incorporation of glyoxal with PMDI could result in the desired crosslinking efficiency and good interfacial adhesion by compromising the advantages and disadvantages of glyoxal or PMDI alone as crosslinkers, which balanced the performances of the wood flour/soybean protein composite. The preferable combination crosslinker was composed of 50 wt % glyoxal and 50 wt % PMDI. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41387.
机译：使用木粉和大豆蛋白开发了一种具有良好机械性能和可接受的生物降解性的绿色复合材料，该蛋白经过热碱降解以及与乙二醛和多异氰酸酯（PMDI）的化学交联改性。傅立叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）结合传统评估方法，研究了交联大豆蛋白和交联改性木材/大豆蛋白复合材料的结构，形态和性能，以了解其效果。交联剂种类对大豆蛋白-木粉复合材料的机械性能，耐水性和微生物降解的影响。结果表明，化学交联改性可以提高木材的力学性能和耐水性，但在一定程度上降低木材/蛋白质复合材料的生物降解性。乙二醛和PMDI单独作为交联剂都不能完美地修饰大豆蛋白，因为PMDI的反应活性很高，而乙二醛的交联反应活性很低。乙二醛与PMDI的结合可以通过牺牲乙二醛或PMDI作为交联剂的优缺点来达到所需的交联效率和良好的界面粘合性，从而平衡了木粉/大豆蛋白复合材料的性能。优选的组合交联剂由50重量％乙二醛和50重量％PMDI组成。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41387。

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