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Kinetic study of titanium-modified phenolic resin curing process by DSC analysis

机译：DSC分析的钛改性酚醛树脂固化过程的动力学研究

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A Titanium-modified phenol-formaldehyde resin (Ti-PF) was prepared. FT-IR was adopted to characterize the molecular structure of the modified resin. And the curing behavior and curing kinetic characteristics were studied by differential scanning calorimetry (DSC). The initial curing temperature Ti, the exothermic peak temperature T_p and the end curing temperature Td of Ti-PF are 153.1°C, 172.5°C and 193.9°C, respectively, all about 10°C higher than that of the unmodified phenolic resin. The Kissinger and Crane equations were applied to establish the curing kinetic parameters of Ti-PF. The kinetic analysis indicates the activation energy for the Ti-PF is 79.9kJ·mol~(-1), lower than that of the unmodified phenolic resin(87.6kJ·mol~(-1)). In addition, the thermal degradation behavior of the cured Ti-PF was studied by thermal gravimetric (TG) method. TG results show that the char yield of Ti-PF is 73.3% at 850°C, while that of the unmodified phenolic resin is only 62.3%. It demonstrated that titanium-modified phenolic resin has much better thermal stability compared with the unmodified one.
机译：制备钛改性酚醛树脂（TI-PF）。采用FT-IR来表征改性树脂的分子结构。通过差示扫描量热法（DSC）研究了固化行为和固化动力学特性。初始固化温度Ti，放热峰值温度T_P和Ti-PF的最终固化温度Td为153.1℃，172.5℃和193.9℃，全约10℃高于未改性酚醛树脂。吻手柄和起重机方程被应用于建立Ti-PF的固化动力学参数。动力学分析表明Ti-PF的活化能量为79.9kJ·mol〜（-1），低于未改性酚醛树脂（87.6kj·mol〜（-1））。另外，通过热重量（Tg）方法研究了固化的Ti-PF的热降解行为。 TG结果表明，850℃的Ti-PF的炭产量为73.3％，而未经修改的酚醛树脂的炭产率仅为62.3％。它表明，与未修饰的一个相比，钛改性酚醛树脂具有更好的热稳定性。

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