分离
自愈水凝胶
化学工程
聚合物
单体
化学
二价
动态力学分析
结晶
离子键合
高分子化学
生物高聚物
材料科学
离子
有机化学
工程类
作者
Ying Zhao,Wei Shen,Zhigang Chen,Tao Wu
标识
DOI:10.1016/j.carbpol.2016.04.047
摘要
Adding divalent ions or lowering pH below the pKa values of alginate monomers are common ways in preparing alginate gels. Herein a new way of preparing alginate gels using freeze-thaw technique is described. Solvent crystallization during freezing drove the polymers to associate into certain structures that became the junction zones of hydrogels after thawing. It enabled the preparation of alginate gels at pH 4.0 and 3.5, two pH at which the gel could not be formed previously. At pH 3.0 where alginate gel could be formed initially, applying freeze-thaw treatment increased the gel storage modulus almost 100 times. The formation of hydrogels and the resulting gel properties, such as dynamic moduli and gel syneresis were influenced by the pH values, number of freeze-thaw cycles, alginate concentrations, and ionic strengths. The obtained hydrogels were soft and demonstrated a melting behavior upon storage, which may find novel applications in the biomedical industry.
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