文献类型：期刊文献

英文题名：Preparation of PVA–CS/SA–Ca2+ Hydrogel with Core–Shell Structure

作者：Zhang, Shuai[1,2] Wan, Yu[1,3] Yuan, Weijie[1,2] Zhang, Yaoxiang[1,2] Zhou, Ziyuan[1,2] Zhang, Min[1,3] Wang, Luzhen[4] Wang, Ran[1,2]

第一作者：张帅;Zhang, Shuai

机构：[1] Experimental Center of Forestry in North China, Chinese Academy of Forestry, Beijing, 102300, China; [2] National Permanent Scientific Research Base for Warm Temperate Zone Forestry of Jiulong Mountain in Beijing, Beijing, 102300, China; [3] School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi’an, 710021, China; [4] Qinghai Provincial Investigation, Design &Research Institute of Water Conservancy & Hydropower Co., Ltd., Xining, 810000, China

年份：2022

卷号：14

期号：1

外文期刊名：Polymers

收录：EI(收录号：20220211439876);Scopus(收录号：2-s2.0-85122289360)

语种：英文

外文关键词：Fourier transform infrared spectroscopy - Scanning electron microscopy - Shells (structures) - Morphology

摘要：Hydrogels are highly hydrophilic polymers that have been used in a wide range of appli-cations. In this study, we prepared PVA–CS/SA–Ca2+ core–shell hydrogels with bilayer space by cross-linking PVA and CS to form a core structure and chelating SA and Ca2+ to form a shell structure to achieve multiple substance loading and multifunctional expression. The morphology and structure of core–shell hydrogels were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The factors affecting the swelling properties of the hydrogel were studied. The results show that the PVA–CS/SA–Ca2+ hydrogel has obvious core and shell structures. The SA concentration and SA/Ca2+ cross-linking time show a positive correlation with the thickness of the shell structure; the PVA/CS mass ratio affects the structural characteristics of the core structure; and a higher CS content indicates the more obvious three-dimensional network structure of the hydrogel. The optimal experimental conditions for the swelling degree of the core–shell hydrogel were an SA concentration of 5%; an SA/Ca2+ cross-linking time of 90 min; a PVA/CS mass ratio of 1:0.7; and a maximum swelling degree of 50 g/g. ? 2022 by the authors. Licensee MDPI, Basel, Switzerland.