Abstract:

A novel type of propenyloxy cucurbituril [7]/polyacrylic hydrogel ((C₃H₅O)₁CB [7]/PAA gel) with high elasticity and self-healing properties was fabricated by making use of propenyloxy cucurbituril [7] to replace N,N-methylene-bis-acrylamide (BIS), which is a traditional cross-linking agent. The structure of the hydrogel was characterized by IR and¹H NMR. The swelling and mechanical properties of the hydrogel were studied, and the self-healing properties were observed macroscopically. The results show that multiple hydrogen bonds was considered as the mainly force in the formation of (C₃H₅O)₁CB [7]/PAA gel's network. The hydrogel has excellent self-healing and mechanical properties in acrylic acid(AA 17.2%, water 82.1%, propenyloxy cucurbituril [7] ((C₃H₅O)₁CB [7]) 0.33%, potassium persulfate(KPS) 0.33%. The maximum elongation of (C₃H₅O)₁CB[7]/PAA gel is 105.6 cm (86 times the original length) and the elastic modulus is 0.39 kPa, and the equilibrium swelling ratio is 600%. (C₃H₅O)₁CB[7]/PAA gel would be a potential bio-tissue engineering material.

Key words: acrylic acid, self-healing hydrogel, gel, polymers, preparation

摘要：

用丙烯氧基七元瓜环（（C₃H₅O）₁CB[7]）替代传统的交联剂N，N-亚甲基双丙烯酰胺（BIS）制备了新型丙烯氧基七元瓜环/聚丙烯酸凝胶（（C₃H₅O）₁CB[7]/PAA gel），该凝胶具有高弹性和自愈性。采用IR和¹H NMR技术对其结构进行表征，研究了该水凝胶的溶胀、力学性能，宏观观察了其自愈性能。结果表明：（C₃H₅O）₁CB[7]/PAA gel的网络形成作用力主要是多重氢键；在丙烯酸（AA）17.2%，水82.1%，（C₃H₅O）₁CB[7]0.33%，过硫酸钾（KPS）0.33%时该水凝胶具有良好的自愈性及力学性能，其最大伸长量为105.6 cm，为原长的86倍，弹性模量0.39 kPa，平衡溶胀率是600%。该水凝胶有望成为一种潜在的生物组织工程材料。

关键词: 丙烯酸, 自愈水凝胶, 凝胶, 聚合物, 制备