Crosslinking of poly(vinyl alcohol) via bis(β-hydroxyethyl) sulfone
Crosslinking of poly(vinyl alcohol) via bis(β-hydroxyethyl) sulfone
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DOI：
10.1295/polymj.36.472
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发表时间：
2004-01-01
期刊：
影响因子：
2.8
通讯作者：
Mizoguchi, K
中科院分区：
文献类型：
--
作者：
Kumeta, K;Nagashima, I;Mizoguchi, K
采用双（β-羟乙基）砜（BHES）对聚乙烯醇（PVA）进行高温交联，以提高PVA的耐水性。筛选出交联反应的最佳条件，如温度、热处理时间、BHES或催化剂的用量等。交联聚乙烯醇的耐水性的特征在于在水中的溶胀和重量损失。将BHES加入到PVA中，然后在高温下加热，导致交联结构的成功形成。交联发生在160 ℃以上，并且在高温下比在低温下需要更短的时间。交联催化剂碳酸钠在160 ℃时比在200 ℃时更有效。使用差示扫描量热法的热分析的结果表明，催化剂对BHES起作用，以降低交联反应的温度，并且即使交联的膜也具有PVA结晶。用BHES和碳酸钠交联的方法可制备高耐水性的PVA基离子交换纤维。
Poly(vinyl alcohol) (PVA) was crosslinked via bis(beta-hydroxyethyl) sulfone (BHES) at elevated temperatures to improve the water resistance. The best conditions for the crosslinking such as temperature, heat-treatment period, and amount of BHES or catalyst were screened out. Water resistance of the crosslinked PVA was characterized in terms of swelling and weight loss in water. The addition of BHES into PVA followed by heating at elevated temperature resulted in successful formation of crosslinking structure. The crosslinking occurs above 160degreesC and takes shorter period at high temperature than low temperature. The crosslinking catalyst, sodium carbonate, acts more effectively at 160degreesC than at 200degreesC. The results from thermal analysis using a differential scanning calorimetry revealed that the catalyst functions against BHES to lower the temperature for the crosslinking reaction and that even the crosslinked films have the PVA crystalline. The crosslinking procedure using BHES and sodium carbonate is applicable to form ion-exchange fibers based on PVA with high water resistance.