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研究了松香与甲基丙烯酸-β-羟乙酯(HEMA)的酯化反应和加成反应,探讨了阻聚剂、催化剂种类和用量、反应温度和原料配比等对酯化反应和加成反应的影响,并采用红外光谱(FT-IR)法和热重分析(TGA)法分别表征了产物的分子结构和酯化物的热稳定性。结果表明:松香分子中的羧基和双键分别与HEMA分子中的羟基和双键发生了酯化反应和加成反应;氧化锌是酯化反应较好的催化剂,当w(氧化锌)=1.0%(相对于松香而言)、反应温度为220℃时,有利于酯化反应的进行;HEMA用量越多,越有利于加成反应的进行;FT-IR表明已成功制取了松香与HEMA的反应产物,TGA表明该产物的热稳定性明显提高。
The esterification reaction and addition reaction of rosin with β-hydroxyethyl methacrylate (HEMA) were studied. The effects of polymerization inhibitor, type and amount of catalyst, reaction temperature and the ratio of raw materials on the esterification and addition The FT-IR and TGA methods were used to characterize the molecular structure of the product and the thermal stability of the esterified product, respectively. The results showed that the carboxyl groups and double bonds in the rosin molecules were respectively esterified and added with the hydroxyl and double bonds in the HEMA molecule. Zinc oxide was a good catalyst for esterification. When w (zinc oxide) = 1.0 % (Relative to rosin), the reaction temperature is 220 ℃, is conducive to the esterification reaction; HEMA dosage is more conducive to the addition reaction; FT-IR shows that the system has been successfully prepared rosin and HEMA Of the reaction product, TGA showed that the thermal stability of the product was significantly improved.