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首页> 外文期刊>Journal of industrial and engineering chemistry >Cure kinetics of melamine-formaldehyde resin/clay/cellulose nanocomposites
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Cure kinetics of melamine-formaldehyde resin/clay/cellulose nanocomposites

机译:三聚氰胺-甲醛树脂/粘土/纤维素纳米复合材料的固化动力学

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摘要

As a part of improving the properties of surface laminates for wood-based panel products, this study attempted to investigate cure kinetics of the melamine-formaldehyde (MF) resin/clay/cellulose nanocomposites. Three different methods (Ozawa, Kissinger, and isoconversion) of differential scanning calorimetry (DSC) were employed to study cure kinetics of the nanocomposites, using three different heating rates (5, 10 and 20°C/min). Both Ozawa and Kissinger methods showed that the overall activation energy (E_a) of the nanocomposite at the 0.5 wt% nanoclay level reached a maximum and then decreased thereafter. But, the Ozawa method provided greater E_a values than those of the Kissinger method. The isoconversional method provided the change of activation energy (E_a) values as a function of the degree of conversion (a). The E_a values increased as the degree of conversion increased, while the influence of nanoclay levels followed a similar trend to the overall E_a values from the both Ozawa and Kissinger methods. These results indicated that the exfoliation of layered nanoclay particles into MF resin delayed the cure of MF resinanoclay/cellulose nanocomposites.
机译:作为改善人造板表面层压板性能的一部分,本研究试图研究三聚氰胺-甲醛(MF)树脂/粘土/纤维素纳米复合材料的固化动力学。使用三种不同的加热速率(5、10和20°C / min),采用差示扫描量热法(DSC)的三种不同方法(小泽,基辛格和同质转化)来研究纳米复合材料的固化动力学。 Ozawa和Kissinger方法均显示,纳米复合材料在0.5 wt%纳米粘土含量下的总活化能(E_a)达到最大值,然后降低。但是,与基辛格方法相比,小泽方法提供的E_a值更大。等转化方法提供了活化能(E_a)值随转化度(a)的变化。 E_a值随转化率的增加而增加,而纳米粘土含量的影响与小泽和基辛格方法得出的总E_a值趋势相似。这些结果表明,层状纳米粘土颗粒剥落到MF树脂中延迟了MF树脂/纳米粘土/纤维素纳米复合材料的固化。

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