文献类型：期刊文献

英文题名：Utilization of hollow kapok fiber for the fabrication of a pH-sensitive superabsorbent composite with improved gel strength and swelling properties

作者：Shi, Xiaoning[1,2];Wang, Wenbo[1];Zheng, Yian[1];Wang, Aiqin[1]

第一作者：施小宁;Shi, Xiaoning

通信作者：Shi, XN[1]

机构：[1]Chinese Acad Sci, Lanzhou Inst Chem Phys, Ctr Ecomat & Green Chem, Lanzhou 730000, Peoples R China;[2]Gansu Univ Tradit Chinese Med, Lanzhou 730000, Peoples R China

第一机构：Chinese Acad Sci, Lanzhou Inst Chem Phys, Ctr Ecomat & Green Chem, Lanzhou 730000, Peoples R China

通信机构：[1]corresponding author), Chinese Acad Sci, Lanzhou Inst Chem Phys, Ctr Ecomat & Green Chem, Lanzhou 730000, Peoples R China.

年份：2014

卷号：4

期号：92

起止页码：50478

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20144400137718);Scopus(收录号：2-s2.0-84908147019);WOS:【SCI-EXPANDED(收录号:WOS:000344325400024)】；

基金：The authors gratefully acknowledge joint support of this research by the National Natural Science Foundation of China (no. 21107116 and 21377135).

语种：英文

外文关键词：Free radicals - Rate constants - Fourier transform infrared spectroscopy - Scanning electron microscopy - Fabrication - Grafting (chemical) - Water absorption - Crosslinking - Sodium

摘要：A pretreated kapok fiber (PKF) with a hollow tube structure was introduced into a poly(sodium acrylate) network by a simultaneous free-radical graft copolymerization and crosslinking reaction to fabricate a novel kapok fiber-g-poly(sodium acrylate) (PNaA/PKF) superabsorbent composite. The network characteristics and surface morphologies of the PNaA/PKF superabsorbent composite were investigated by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), as well as by determination of mechanical properties, swelling and stimuli responses to salts, and pH. The results showed that the incorporation of a specific amount of PKF not only improved the water absorption, but also the gel content and gel strength. The composite with 10 wt% PKF showed the best water absorption, gel content and gel strength. The swelling kinetics of the composite followed Schott's pseudo-second-order kinetics model, and the swelling rate constant was enhanced 2.63 fold after adding 10 wt% PKF. The swelling and deswelling behaviors in various saline and pH solutions revealed the stimuli-sensitivity of the PNaA/PKF composite to salt concentration, ionic charge and external pH, and a remarkable time-dependent swelling process with an overshooting characteristic was observed in pH 2 solutions.