胶粘剂
化学
凝胶渗透色谱法
傅里叶变换红外光谱
蒙脱石
材料科学
氢键
化学工程
有机化学
聚合物
分子
工程类
图层(电子)
作者
Binghan Zhang,Wei Zhu,Ying Lu,Zhenhua Gao,Jiyou Gu
标识
DOI:10.1016/j.indcrop.2014.03.027
摘要
A novel soybean protein-based wood adhesive with improved water resistance was developed using thermal-caustic degraded soybean proteins with modifications by polyisocyanate and nano-scale montmorillonite (MMT). A gel permeation chromatography (GPC) analysis, X-ray diffraction (XRD) measurement, Fourier transform infrared spectroscopy (FTIR) analysis, traditional chemical analysis and plywood evaluation indicated that the thermal-caustic degradation process effectively reduced the viscosity of the high-concentration soybean protein solution due to the sharp decrease in the molecular weight of the soybean proteins. Crosslinking by polyisocyanate increased the molecular weight and produced soybean protein with a crosslinked structure, which improved the water resistance but clearly shortened the work life of the polyisocyanate-modified soybean protein adhesive. The addition of 3% MMT effectively prolonged the work life of the modified soybean protein adhesive and reduced the bond strength to some extent. A nano-scale blocking mechanism of MMT that retards the effects on some properties of soybean protein adhesive was presented because the exfoliated nano-scale MMT platelets not only reduced the number but also increased the steric hindrance of some active groups of soybean proteins via hydrogen and electrostatic bonds.
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