摘要
水凝胶作为一种特殊的材料形式在自愈合应用方面具有广阔的前景,研发功能更全面、自愈合能力更强的水凝胶很有必要。本工作以AlCl_(3)化学交联聚乙烯醇与角蛋白,构建由氢键网络、Al^(3+)络合网络互穿的双网络结构,制备自愈合性能良好的PVA/KE复合水凝胶。通过红外光谱、扫描电镜、热重分析仪、万能材料拉伸仪对水凝胶的结构和性能进行表征。结果表明:交联剂的增加使水凝胶表面由粗糙变细滑,内部形成孔径范围由大变小、孔型结构由开孔变为紧密的三维多孔结构;双网络结构造成水凝胶特征峰吸收强化和位置偏移,增加水凝胶热降解所需能量,影响热降解行为,使残留物增加,热稳定性改善;氯化铝浓度增大使水凝胶的韧性提高,浓度为2%时断裂强度和断裂伸长率最大,分别为8.28 MPa和163.2%;水凝胶的自愈合和抗疲劳性具有变化的一致性,自愈合效能随着交联剂浓度的增加、愈合时间的延长而增加,愈合时间为12 h且交联剂浓度为2%时愈合效能最好,能够达到89.4%,表现出明显的自修复功能。本研究结果为深入探索水凝胶的自愈合性能奠定了实践基础。
As a special material form,hydrogel has broad prospects in self-healing application.It is necessary to develop hydrogels with more comprehensive function and stronger self-healing ability.In this work,AlCl_(3)for chemically crosslinking poly(vinyl alcohol)(PVA)and wool keratin(KE)was used to construct a dual network structure with hydrogen bonding network and Al^(3+)ion complexation network interpenetrating,and the PVA/KE composite hydrogels with good self-healing properties were prepared.The structure and properties of the hydrogels were characterized by FTIR,SEM,TG and universal tensile tester.The results showed that the hydrogel surface became rough and slippery,a three-dimensional porous structure inside hydrogel vary their pore sizes from big to small,alter their pore shape from open to tight,with the increase of crosslinking agent.The dual-network structure resulted in absorption enhancement and migration of hydrogel peaks in FTIR,which increased the energy requirement for thermal degradation of hydrogels,and affected the thermal degradation behavior with increasing the weight loss rate of residues.When the concentration of aluminum chloride increased,the strength and elongation at break of hydrogel increased,the sample at the concentration 2%reach the best strength and elongation at break with 8.28 MPa and 163.2%respectively.The self-healing and fatigue resistance of hydrogels were consistent,which was closely related to the concentration of aluminum chloride and healing time,and the healing efficiency of hydrogel increased with the increase of crosslinking agent concentration and healing time.When the healing time was 12 h and the concentration of crosslinking agent was 2%,the best healing efficiency occurred and reach up 89.4%.The results of this study lay a practical foundation for further exploring self-healing properties of hydrogels.
作者
许梦媛
刘让同
李亮
刘淑萍
李淑静
XU Mengyuan;LIU Rangtong(LI Liang,LIU Shuping,LI Shujing College of Fashion Technology,Zhongyuan University of Technology,Zhengzhou 450007,China)
出处
《材料导报》
CSCD
北大核心
2023年第15期247-252,共6页
Materials Reports
基金
国家重点基础研究计划(2017YFB0309100)。
关键词
聚乙烯醇
羊毛角蛋白
氯化铝
水凝胶
自愈合
polyvinyl alcohol
wool keratin
aluminum chloride
hydrogel
self-healing