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次氯酸钠处理多孔PAN纤维的结构与吸附性能研究
Authors
俞成丙
张永刚
+3 more
王燕菲
王雪飞
钱鑫
Publication date
1 January 2017
Publisher
Abstract
以聚丙烯腈/聚乙烯吡咯烷酮/二甲基亚砜(PAN/PVP/DMSO)三元体系为纺丝液,以DMSO/H_2O为凝固浴,在凝固浴温度为60℃下,通过湿法纺丝制备了具有介孔结构的多孔PAN/PVP纤维;用次氯酸钠(NaClO)对多孔PAN/PVP纤维进行处理,制得了NaClO@PAN/PVP纤维,采用场发射扫描电镜、元素分析仪和氮气气体吸附仪对处理前后纤维的表面形貌、元素组成、比表面积和孔径进行了表征,研究了凝固浴浓度和温度对PAN/PVP纤维和NaClO@PAN/PVP纤维的PVP含量及比表面积和孔径的影响。结果表明:经NaClO处理后,NaClO@PAN/PVP纤维中氧含量减少,氮含量增多,PVP含量减少,纤维表面变得光滑,平均孔径减小,孔数增多,比表面积增大;随着凝固浴DMSO浓度增大或温度升高,PAN/PVP纤维,NaClO@PAN/PVP纤维中的PVP含量降低,但其比表面积随凝固浴浓度的增大而减小,随凝固浴温度的升高而先升高后减小;在凝固浴DMSO质量分数为0,温度为60℃的条件下制得的PAN纤维、PAN/PVP纤维、NaClO@PAN/PVP纤维的比表面积分别为38,96,108 m~2/g,平均孔径分别为22.7,20.4,19.0 nm;PAN/PVP纤维、NaClO@PAN/PVP纤维的最可几孔径分布在40 nm左右,属于介孔结构
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Last time updated on 22/01/2018