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首页> 外文期刊>Journal of Applied Polymer Science >Evaluation of isomeric composition of resol-type phenol formaldehyde matrix resins for silica-phenolic composites and its effect on cure characteristics of the resin
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Evaluation of isomeric composition of resol-type phenol formaldehyde matrix resins for silica-phenolic composites and its effect on cure characteristics of the resin

机译：硅酚类复合酚醛型酚醛基树脂的异构体组成评价及其对树脂固化性能的影响

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摘要

The isomeric composition of several samples of resol-type phenol formaldehyde resins used for silica-phenolic composites was evaluated by H-1- and C-13-NMR spectroscopy and reverse-phase HPLC techniques. The variations in the isomeric compositions were attributed to inadvertent variations in the process parameters. A mathematical relation was determined for calculation of free phenol from H-1-NMR measurements. The samples were cured at 160degreesC for 8 h in an inert atmosphere of N-2. The extent of cure in the hardened samples was measured by FTIR analysis. The effect of isomeric composition on the extent of cure was studied. Free phenol and p-hydroxymethyl phenol, exhibiting a linear correlation, were found to have a pronounced effect on the extent of cure. The cure kinetics were derived by dynamic DSC measurements. Activation energy (E) for curing exhibited a near linear correlation independently with free phenol content and the extent of cure. (C) 2003 Wiley Periodicals, Inc. [References: 17]
机译：通过H-1和C-13-NMR光谱法以及反相HPLC技术评估了用于二氧化硅-酚醛复合材料的几种酚醛型酚醛树脂样品的异构体组成。异构体组成的变化归因于工艺参数的无意变化。确定了用于从H-1-NMR测量计算游离酚的数学关系式。样品在N-2惰性气氛下于160°C固化8小时。通过FTIR分析测量硬化样品中的固化程度。研究了异构体组成对固化程度的影响。发现具有线性相关性的游离苯酚和对羟甲基苯酚对固化程度有显着影响。固化动力学是通过动态DSC测量得出的。用于固化的活化能（E）与游离酚含量和固化程度无关，具有接近线性的相关性。 （C）2003 Wiley Periodicals，Inc. [参考：17]

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