文献类型：期刊文献

英文题名：High-performance poly(acrylic acid) hydrogels formed with a block copolymer crosslinker containing amino-acid derivatives

作者：Zhang, Rui[1];Ruan, Hengzhi[1];Zhou, Tianxu[1];Fu, Qionglong[1];Peng, Hongwei[1];Zhu, Xuedong[1];Yao, Yuan[2]

机构：[1]East China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, Minist Educ, Sch Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2019

卷号：15

期号：37

起止页码：7381

外文期刊名：SOFT MATTER

收录：;EI(收录号：20193907480691);WOS:【SCI-EXPANDED(收录号:WOS:000487804800002)】；

基金：This work was supported by the National Natural Science Foundation of China (21374029, 51573088, 21776076). The Projects of Shanghai Municipality (18JC1410802) and International Joint Laboratory of the Chinese Education Ministry on Resource Chemistry are also appreciated.

语种：英文

外文关键词：Carboxylic acids - Amino acids - Adhesives - Hydrogen bonds - Potassium compounds - Atom transfer radical polymerization - Fracture toughness - Ions - Self-healing materials - Block copolymers

摘要：Two block copolymers containing two amino-acid derivatives, PEO-b-PLAA and PEO-b-PAAC, were fabricated through atom transfer radical polymerization (ATRP) or reversible addition-fragmentation chain transfer polymerization (RAFT). Then, they were employed as a macro-crosslinker to prepare high-performance poly(acrylic acid) (PAA) hydrogels named "P(x)A(y)" or "T(y)A(z)". There were numerous synergistic noncovalent interactions with hydrogen bonds between the macro-crosslinker and PAA chains, as well as entanglement of polymer chains. Hence, the hydrogels exhibited desirable mechanical properties and self-healing abilities. For P(x)A(y) hydrogels, the maximum fracture elongation and fracture strength were 9800% and 120.01 kPa, respectively. Moreover, the enhanced physical interaction enabled the hydrogels to have rapid self-healing abilities without stimulation. The hydrogels showed >80% self-healing efficiency and exhibited similar to 10(-3) S cm(-1) electrical conductivity upon the introduction of KCl. Meanwhile, benefitting from doubling the number of carboxyl groups in the macro-crosslinker of the T(y)A(z) hydrogels compared with the P(x)A(y) hydrogels, the mechanical properties of T(y)A(z) hydrogels could be promoted further and notch-insensitivity could be observed. Tough, adhesive, self-healable, and conductive PAA hydrogels with different structures of amino-acid derivatives could aid the development of macro-crosslinkers.