多重非共价相互作用协同构筑κ-卡拉胶基纳米复合水凝胶及其性能  

Synergistic construction ofκ-carrageenan-based nanocomposite hydrogels by multiple noncovalent interactions and their properties

作　　者：匡倩 徐馨怡 丁思彦 景占鑫 KUANG Qian;XU Xinyi;DING Siyan;JING Zhanxin(College of Chemistry and Environment,Guangdong Ocean University,Zhanjiang 524088,China)

机构地区：[1]广东海洋大学化学与环境学院,广东湛江524088

出　　处：《工程塑料应用》2024年第8期13-21,共9页Engineering Plastics Application

基　　金：广东海洋大学本科生创新团队项目(CXTD2023018);省级大学生创新创业项目(S202310566061)。

摘　　要：为提高κ-卡拉胶基水凝胶的性能,提出了一种多重非共价相互作用协同构筑κ-卡拉胶基纳米复合水凝胶的方法。在κ-卡拉胶、铝离子和氧化石墨烯(GO)存在下,通过丙烯酰胺(AM)和丙烯酸(AA)之间的共聚反应以及KCl溶液浸泡过程制备了κ-卡拉胶/聚(丙烯酰胺-共聚-丙烯酸)-Al^(3+)/GO(CA/PAMAA-Al^(3+)/GO)纳米复合水凝胶。分析了制备的CA/PAMAA-Al^(3+)/GO双网状纳米复合水凝胶的化学结构,并评价了其溶胀性能、力学性能、流变性能和自愈性能。结果表明,水凝胶的形成主要依赖于非共价键,如聚合物链与GO之间的氢键、羧基阴离子与Al^(3+)之间的金属配位以及KCl诱导的聚合物链缠结。水凝胶的组成,如GO含量、Al^(3+)含量和AM/AA比例等影响了其溶胀性能、表面形貌和力学性能。AM/AA比例为5/5,Al^(3+)含量为0.20 mmol,GO质量分数为4%(CA/PAMAA_(5/5)-Al^(3+)-_(0.20)/GO-4%)的水凝胶的拉伸强度和断裂伸长率分别可以达到348.7 kPa和1423%。与纯水凝胶相比,GO的引入显著改善了水凝胶的韧性和自恢复能力。此外,CA/PAMAA/GO水凝胶也具有一定的自愈合能力。因此,该研究为制备性能良好的κ-卡拉胶基水凝胶提供了一种新的策略。In order to improve the properties ofκ-carrageenan-based hydrogel,a method of constructingκ-carrageenan-based nanocomposite hydrogel with multiple non-covalent interactions was proposed.κ-carrageenan/poly(acrylamide-co-acrylic acid)-Al^(3+)/graphene oxide(CA/PAMAA-Al^(3+)/GO)nanocomposite hydrogels were prepared by copolymerization between acrylamide and acrylic acid,and immersion in KCl solution in the presence ofκ-carrageenan,aluminum ion and graphene oxide.The chemical structure of the prepared CA/PAMAA-Al^(3+)/GO nanocomposite hydrogel was analyzed,and its swelling,mechanical,rheological and selfhealing properties were evaluated.The results show that the formation of hydrogels is mainly dependent on non-covalent bonds,such as hydrogen bonds between polymer chains and graphene oxide,metal coordination between carboxyl anions and Al^(3+),and KClinduced entanglement of polymer chains.The composition of the hydrogel,such as graphene oxide content,Al^(3+)content and AM/AA ratio,affects its swelling properties,surface morphology and mechanical properties.The tensile strength and elongation at break of CA/PAMAA_(5/5)-Al^(3+)-_(0.20)/GO-4%hydrogel can reach 348.7 kPa and 1423%,respectively.Compared with the neat hydrogel,the introduction of graphene oxide significantly improve the toughness and self-recovery ability of hydrogels.In addition,CA/PAMAA/GO hydrogels also have certain self-healing ability.Therefore,this study provides a new strategy for the preparation ofκ-carrageenan-based hydrogels with excellent properties.

关 键 词：Κ-卡拉胶 水凝胶 纳米复合 性能 

分 类 号：TQ322[化学工程—合成树脂塑料工业]