Preparation and properties of MWCNTs reinforced polyethylene glycol-polyvinyl alcohol composite hydrogel
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摘要: 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MWCNTs/PEG-PVA复合水凝胶的微观形貌变化，并研究了复合凝胶的溶胀性能、拉伸强度、热稳定及导电性能。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先升高后降低。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。Abstract: Carboxy-functionalized multi-walled carbon nanotubes(MWCNTs)/polyethylene glycol (PEG)-poly-vinyl alcohol (PVA) composite hydrogels were prepared by the freezing/thawing method. The microstructure, swelling property, tensile strength, thermal stability and conductivity of MWCNTs/PEG-PVA composite hydrogels with different mass ratios were studied. The results show that the MWCNTs/PEG-PVA hydrogel still has a porous 3D structure, but the pore size becomes smaller after the addition of MWCNTs. When the mass ratio of MWCNTs to PVA is larger than 1.0:100, the uniformity of the porous structure of the MWCNTs/PEG-PVA hydrogel decreases. With the increment of MWCNTs content, the swelling degree and tensile strength of the MWCNTs/PEG-PVA composite hydrogel increase first and then decrease. When the mass ratio of MWCNTs to PVA is 1.0:100, the swelling degree and porosity of the MWCNTs/PEG-PVA hydrogel reach the maximum (1450% and 75.8%, respectively). The tensile strength and elongation reach a maximum value of 0.97 MPa and 384.0%, respectively. The addition of MWCNTs improves the thermal stability of the composite hydrogel, and the initial thermal decomposition temperature of MWCNTs/PEG-PVA composite hydrogel increases from 235℃ to 260℃. With the increment of the amount of MWCNTs, the conductivity of the composite hydrogel increases from 1.10×10-6 S/cm to 6.96×10-4 S/cm.
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Keywords:
- carbon nanotubes /
- polyethylene glycol /
- polyvinyl alcohol /
- hydrogel /
- microstructure /
- tensile strength /
- conductivity
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