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以聚乙烯-乙烯醇(EVOH)为基体,通过化学修饰,在EVOH主链上引入磺酸基来控制产物的离子交换当量(IEC),利用缩醛反应进行交联改性来控制产物水溶性,进而合成出具有高IEC值和低水溶性的交联离子聚合物。反应后经滴定测定出产物的磺化度和IEC值,由红外光谱(FT-IR)表征产物的化学结构。结果表明,1260 cm-1附近磺酸的S=O伸缩振动吸收峰的存在说明了磺化产物的存在;热重分析(TGA)表明,经交联改性后的离子聚合物,其热分解温度由397℃上升到439℃,耐热性明显提高。
Polyethylene-vinyl alcohol (EVOH) was used as a matrix to control the ion exchange equivalent (IEC) of the product through the chemical modification and introduction of sulfonic acid groups on the main chain of EVOH. The acetal reaction was used to modify the water-soluble , And then synthesized with high IEC value and low water-soluble cross-linked ionic polymer. After the reaction, the degree of sulfonation and the IEC value of the product were determined by titration. The chemical structure of the product was characterized by infrared spectroscopy (FT-IR). The results show that the presence of sulfonated products at the S = O stretching vibration of sulfonic acid at 1260 cm-1 indicates the presence of sulfonated products. TGA shows that the thermal decomposition of ionic polymers modified by crosslinking Temperature rose from 397 ℃ to 439 ℃, heat resistance improved significantly.