聚乙烯醇
材料科学
气凝胶
自愈水凝胶
纳米复合材料
水溶液中的金属离子
多孔性
微观结构
傅里叶变换红外光谱
热重分析
聚合物
化学工程
重量分析
复合材料
乙烯醇
水银孔隙仪
扫描电子显微镜
金属
动态力学分析
高分子化学
多孔介质
化学
冶金
有机化学
工程类
作者
Zahra Mohsenian,Mehrdad Kokabi,Ghazaleh Alamdarnejad
标识
DOI:10.1088/1361-665x/acdf9c
摘要
Abstract The utter purpose of this study was to embed metal ions in polymer chains to improve the shape memory behaviour of polyvinyl alcohol (PVA) aerogels in which metal ions were used as cross-linking agents for PVA. PVA–Cu and PVA–Fe hydrogels were first prepared by adding different amounts of Cu (NO 3 ) 2 .3H 2 O and Fe (NO 3 ) 3 .9H 2 O salts, respectively, then aerogel samples were prepared by the freeze-drying of hydrogels. Fourier transform infrared test was employed to evaluate the chemical structure. Gravimetric and mercury porosimetry methods were performed to characterize the porosity of aerogels. Field emission scanning electron microscopy examined the microstructure of the network and the porosity of the aerogels. The shape memory behaviour of the nanocomposite aerogels was evaluated by dynamic-mechanical analysis. The test results showed that by adding 25 wt% copper salt and 40 wt% iron salt to the PVA, the maximum gel fractions were achieved. Compared to pure PVA, the recovery ratios of nanocomposite aerogels increased by about 80% and 140% and their moduli increased by more than 370% and 300%, respectively.
科研通智能强力驱动
Strongly Powered by AbleSci AI