乙烯醇
自愈水凝胶
结晶度
肿胀 的
化学工程
聚合物
高分子化学
材料科学
扩散
阳离子聚合
复合材料
热力学
物理
工程类
作者
Cătălin Croitoru,Mihai Alin Pop,Tibor Bedő,Mihaela Coșniță,Ionuţ Claudiu Roată,Iosif Hulka
出处
期刊:Polymers
[MDPI AG]
日期:2020-03-03
卷期号:12 (3): 560-560
被引量:29
标识
DOI:10.3390/polym12030560
摘要
This paper discusses the structure morphology and the thermal and swelling behavior of physically crosslinked hydrogels, obtained from applying four successive freezing–thawing cycles to poly (vinyl alcohol) blended with various amounts of κ-carrageenan. The addition of carrageenan in a weight ratio of 0.5 determines a twofold increase in the swelling degree and the early diffusion coefficients of the hydrogels when immersed in distilled water, due to a decrease in the crystallinity of the polymer matrix. The diffusion of water into the polymer matrix could be considered as a relaxation-controlled transport (anomalous diffusion). The presence of the sulfate groups determines an increased affinity of the hydrogels towards crystal violet cationic dye. A maximum physisorption capacity of up to 121.4 mg/g for this dye was attained at equilibrium.
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