摘要
将水性聚氨酯(WPU)引入聚乙烯醇(PVA)凝胶体系,通过冷冻-解冻循环交联制备了具有高强度高韧性的WPU/PVA复合凝胶。利用FTIR,XRD,SEM等方法对复合凝胶的化学结构和微观形貌进行了表征,同时考察了力学性能、耐疲劳性能和摩擦磨损性能。实验结果表明,WPU分子链与PVA分子链相互缠结,形成牢固密集的双网络结构。WPU的氨基甲酸酯和羧基与PVA的羟基之间形成了强氢键相互作用。当WPU含量为10%(w)时,WPU/PVA复合凝胶的抗拉强度、断裂伸长率、压缩强度分别可达2.88 MPa、388.87%、2.21 MPa。WPU/PVA复合凝胶在液体环境下还具备优异的疲劳抗性和耐摩擦磨损性能。有望作为组织工程支架材料、人工关节替代材料用于生物体内。
Waterborne polyurethane(WPU) was introduced into polyvinyl alcohol(PVA) gel system,and cyclically freeze-thaw cross-linked to prepare the WPU/PVA composite hydrogel with high strength and toughness.The chemical structure and micromorphology of the composite hydrogels were characterized by FTIR,XRD and SEM.Subsequently,the mechanical performance,fatigue resistance and friction and wear properties of the composite hydrogels were investigated.The results show that,the molecular chains of WPU and PVA are intertwined,forming a strong and dense double network structure.The carbamate and carboxyl groups of WPU form strong interactions of hydrogen bonding with the hydroxyl groups of PVA.When the mass fraction of WPU in the composite is 10%,the tensile strength,elongation at break and compressive strength can reach 2.88 MPa,388.87% and 2.21 MPa,respectively.The WPU/PVA composite hydrogel also exhibits excellent fatigue resistance and friction and wear properties in a liquid environment.This composite hydrogel is expected to be used as in vivo tissue engineering scaffolds and artificial joint substitute material.
作者
王岩森
侯丹丹
祁丽亚
王春堯
郭敏
郭子芳
WANG Yansen;HOU Dandan;QI Liya;WANG Chunyao;GUO Min;GUO Zifang(Sinopec Beijing Research Institute of Chemical Industry,Beijing 100013,China)
出处
《石油化工》
CAS
CSCD
北大核心
2023年第4期498-506,共9页
Petrochemical Technology
基金
中国石油化工集团公司资助项目(16-22ZS0488)。
关键词
水性聚氨酯
聚乙烯醇
水凝胶
机械强度
waterborne polyurethane
polyvinyl alcohol
hydrogel
mechanical strength
