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首页> 外文期刊>Journal of Applied Polymer Science >A study on the curing kinetics of epoxycyclohexyl polyhedral oligomeric silsesquioxanes and hydrogenated carboxylated nitrile rubber by dynamic differential scanning calorimetry
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A study on the curing kinetics of epoxycyclohexyl polyhedral oligomeric silsesquioxanes and hydrogenated carboxylated nitrile rubber by dynamic differential scanning calorimetry

机译：动态差示扫描量热法研究环氧环己基多面体低聚倍半硅氧烷与氢化羧化丁腈橡胶的固化动力学

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摘要

A new organic-inorganic hybrid material was prepared through reactive blending of hydrogenated carboxylated nitrile rubber (HXNBR) with epoxycyclohexyl polyhedral oligomeric silsesquioxanes (epoxycyclohexyl POSS). The structure of the composite was characterized by Fourier transform infrared spectroscopy (FTIR) and solid-state ~(13)C Nuclear Magnetic Resonance spectra (solid-state ~(13)C-NMR). The differential scanning calorimetry (DSC) at different heating rates was conducted to investigate the curing kinetics. A single overall curing process by an nth-order function (1 - α)~n was considered, and multiple-heating-rate models (Kissinger, Flynn-Wall-Ozawa, and Crane methods) and the single-heating-rate model were employed. The apparent activation energy (E_a) obtained showed dependence on the POSS content and the heating rate (β). The overall reaction order n was practically constant and close to 1. The isoconversion Flynn-Wall-Ozawa method was also performed and fit well in the study. With the single-heating-rate model, the average E_a for the compound with a certain POSS content, 66.90-104.13 kJ/mol was greater than that obtained with Kissinger and Flynn-Wall-Ozawa methods. Furthermore, the calculated reaction rate (dα/dt) versus temperature curves fit with the experimental data.
机译：通过将氢化羧化丁腈橡胶（HXNBR）与环氧环己基多面体低聚倍半硅氧烷（环氧环己基POSS）反应共混制备了一种新型的有机-无机杂化材料。通过傅里叶变换红外光谱（FTIR）和固态〜（13）C核磁共振谱（固态〜（13）C-NMR）对复合材料的结构进行了表征。进行了不同加热速率的差示扫描量热法（DSC），以研究固化动力学。考虑通过n阶函数（1-α）〜n进行的单一整体固化过程，并采用了多种加热速率模型（Kissinger，Flynn-Wall-Ozawa和Crane方法）和单一加热速率模型。受雇。获得的表观活化能（E_a）显示出与POSS含量和加热速率（β）有关。总体反应级数n实际上是恒定的，接近1。还进行了等转化Flynn-Wall-Ozawa方法，该方法非常适合本研究。在单加热速率模型中，具有一定POSS含量（66.90-104.13 kJ / mol）的化合物的平均E_a大于用Kissinger和Flynn-Wall-Ozawa方法获得的平均E_a。此外，计算的反应速率（dα/ dt）对温度的曲线与实验数据吻合。

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