离子双交联海藻酸钠/聚(丙烯酰胺-co-丙烯酸)高强度水凝胶的研究  

Study on Dual Ionically Crosslinked Sodium Alginate/Poly(acrylamide-co-acrylic acid)High Strength Hydrogel

作　　者：李学锋[1,2] 王慧 龙世军 黄以万[1,2] 李海燕 LI Xuefeng;WANG Hui;LONG Shijun;HUANG Yiwan;LI Haiyan(Hubei Provincial Key Laboratory of Green Materials for Light Industry,Hubei University of Technology,Wuhan 430068,China;School of Materials Science and Engineering,Hubei University of Technology,Wuhan 430068,China;School of Biomedical Engineering,Shanghai Jiao Tong University,Shanghai 200030,China)

机构地区：[1]湖北工业大学绿色轻工材料湖北省重点实验室,武汉430068 [2]湖北工业大学材料与化学工程学院,武汉430068 [3]上海交通大学生物医学工程学院,上海200030

出　　处：《材料导报》2020年第16期16149-16154,共6页Materials Reports

基　　金：国家自然科学基金(51273059);武汉市科学技术局应用基础前沿项目(2019010701011397)。

摘　　要：利用海藻酸盐分子和共聚物链上丰富的羧基与多价金属离子的高配位能力,采用“一步法”离子双交联制备了高强度、高韧性的海藻酸钠/聚(丙烯酰胺-co-丙烯酸)-Fe^3+(S/P-Fe^3+)双网络水凝胶。对浸泡多种金属离子(Na^+、Ca^2+、Cu^2+、Al^3+、Fe^3+)溶液得到的金属离子双交联水凝胶的力学性能展开研究,结果表明,随着金属离子价态的升高,水凝胶的力学强度逐渐增大,其中铁离子的增强效果最好。通过优化SA含量、AAc与AAm的比例以及Fe^3+浓度,获得最佳配比的S/P-Fe^3+(SA 2%(质量分数,下同),AAc 5%(摩尔分数,下同)和Fe^3+0.06 mol/L)高强度水凝胶,其力学性能优越(拉伸强度3.24 MPa,断裂伸长率1228%),同时该离子双交联高强度水凝胶还具有高的含水量(76%)。此外,S/P-Fe^3+水凝胶的交联强度受环境影响,通过pH值变化可调节其力学性能,使其具备形状记忆性。High strength and toughness dual ionically crosslinked sodium alginate/poly(acrylamide-co-acrylic acid)(S/P-Fe 3+)double network hydrogels were prepared by“one-step”dual ionically crosslinking.We take advantage of the abundant carboxyl groups on alginate molecules and the copolymer chains and their high coordination capacity with multivalent cations to obtain high strength and toughness.The mechanical properties of hydrogels with different cations dual crosslinked were obtained by soaking different cations(Na+,Ca 2+,Cu 2+,Al 3+,Fe 3+),the results show that the mechanical strength of hydrogels increases with the increase of the valence state of cations,among which the mechanical properties of Fe 3+dual crosslinked hydrogels are much higher than the other cations.By adjusting the content of SA,the ratio of AAc to AAm,and the concentration of Fe 3+,the optimal S/P-Fe 3+(SA 2wt%and AAc 5mol%)hydrogels showed a remarkable mechanical performance with 3.24 MPa tensile strength and 1228%strain,both of which remained stable with 76%water content.In addition,the crosslinked strength of S/P-Fe 3+hydrogel is affected by the environment of pH,and the hydrogels with different mechanical properties and shape memory can be obtained by pH adjustment.

关 键 词：金属离子 离子双交联 水凝胶 高强度 形状记忆性 

分 类 号：TB332[一般工业技术—材料科学与工程]