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首页> 外文期刊>Journal of Applied Polymer Science >IR spectroscopy: Suitable method for determination of curing degree and crosslinking type in melamine-formaldehyde resins
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IR spectroscopy: Suitable method for determination of curing degree and crosslinking type in melamine-formaldehyde resins

机译：IR光谱：三聚氰胺 - 甲醛树脂中的固化度和交联型的合适方法

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摘要

Melamine-formaldehyde (MF) resins are widely used as adhesives and finishing materials in the wood industry. During resin cure, either methylene ether or methylene bridges are formed, leading to the formation of a three-dimensional resin network. Not only the curing degree, but also the chemical species present in the cured resin determine the quality of the final product. Analytical methods allowing a detailed investigation of network formation are of great benefit to manufacturers. In the present work, resin cure of an MF precondensate is studied at different temperatures (100-200 degrees C) without considering the initial pH as a factor. Isoconversional kinetic analysis based on exothermal curing enthalpies enables calculation of the crosslinking degree at a given time/temperature regime. A semiquantitative determination of the chemical groups present is performed based on solid-state nuclear magnetic resonance data. Fourier transform infrared spectroscopy has shown to be a fast and reliable analytical tool with high sensitivity toward functional groups and with great potential for at-line process control. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47691.
机译：三聚氰胺 - 甲醛（MF）树脂广泛用作木材工业中的粘合剂和整理材料。在树脂固化期间，形成亚甲基醚或亚甲基桥，导致形成三维树脂网络。不仅固化程度，而且固化树脂中存在的化学物质也决定了最终产品的质量。分析方法允许详细调查网络形成对制造商具有很大的好处。在本作工作中，在不同温度（100-200℃）的情况下，在不同温度下研究了MF预晶体的树脂固化，而不考虑初始pH作为一个因素。基于放热固化焓的异组值动力学分析使得能够计算给定时间/温度制度的交联度。基于固态核磁共振数据进行存在的化学基团的半定量测定。傅里叶变换红外光谱表明是一种快速且可靠的分析工具，对官能团具有高灵敏度，并且具有巨大潜力的轨道过程控制。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019,136,47691。

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