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利用冻融循环法制备了羧基化多壁碳纳米管(MWCNTs)/聚乙二醇(PEG)-聚乙烯醇(PVA)复合水凝胶。考察了不同质量配比下复合水凝胶的微观形貌变化,并对复合凝胶的溶胀性能,拉伸强度、热稳定及导电性能进行了研究。结果表明,加入MWCNTs后MWCNTs/PEG-PVA复合凝胶仍具有多孔的三维网状结构但孔径尺寸变小。当MWCNTs与PVA的质量比大于1.0:100时,MWCNTs/PEG-PVA复合凝胶的孔洞的均匀性降低。随着MWCNTs量的增加,MWCNTs/PEG-PVA复合凝胶的溶胀度及拉伸强度均呈先升高后降低的趋势。当MWCNTs与PVA的质量比为1.0:100时,MWCNTs/PEG-PVA复合凝胶的溶胀度达到最大(1450%),孔隙率最高(75.8%),拉伸强度及断裂伸长率达到最大值,分别为0.97 MPa和384.0%。MWCNTs的加入提高了MWCNTs/PEG-PVA复合凝胶的热稳定性,MWCNTs/PEG-PVA复合凝胶的初始热分解温度从235℃上升至260℃;随着MWCNTs量的增加,MWCNTs/PEG-PVA复合凝胶的电导率从1.10×10-6 S/cm升高至6.96×10-4 S/cm。
Carboxylated multiwalled carbon nanotubes (MWCNTs) / polyethylene glycol (PEG) - polyvinyl alcohol (PVA) composite hydrogels were prepared by freeze - thaw cycles. The morphological changes of the composite hydrogels under different mass ratios were investigated. The swelling properties, tensile strength, thermal stability and electrical conductivity of the composite hydrogels were investigated. The results show that the MWCNTs / PEG-PVA composite gel still has a porous three-dimensional network structure but the pore size becomes smaller after adding MWCNTs. When the mass ratio of MWCNTs to PVA is greater than 1.0: 100, the uniformity of the pores of the MWCNTs / PEG-PVA composite gel decreases. With the increase of the amount of MWCNTs, the swelling degree and tensile strength of MWCNTs / PEG-PVA composite gel first and then decreased. When the mass ratio of MWCNTs to PVA is 1.0: 100, the swelling degree of MWCNTs / PEG-PVA composite gel reaches the maximum (1450%), the porosity is the highest (75.8%), the tensile strength and elongation at break reach the maximum , Respectively, 0.97 MPa and 384.0%. The initial thermal decomposition temperature of MWCNTs / PEG-PVA composite gel increased from 235 ℃ to 260 ℃ with the addition of MWCNTs. With the increase of MWCNTs, the MWCNTs / PEG- The conductivity of PVA composite gel increased from 1.10 × 10-6 S / cm to 6.96 × 10-4 S / cm.