Dual dynamic network system constructed by waterborne polyurethane for improved and recoverable performances

被引：76

作者：

Liang, Rihui ^{[1
,2
]}

Zhang, Haotian ^{[1
,2
]}

Wang, Yuhang ^{[1
,2
]}

Ye, Jun ^{[1
,2
]}

Guo, Longhai ^{[1
,2
]}

He, Lifan ^{[1
,2
]}

Li, Xiaoyu ^{[1
,2
]}

Qiu, Teng ^{[1
,2
]}

Tuo, Xinlin ^{[3
]}

机构：

[1] Beijing Univ Chem Technol, Key Lab Carbon Fiber & Funct Polymers, Minist Educ, Beijing 100029, Peoples R China

[2] Beijing Univ Chem Technol, Beijing Engn Res Ctr Synth & Applicat Waterborne, Beijing 100029, Peoples R China

[3] Tsinghua Univ, Dept Chem Engn, Key Lab Adv Mat MOE, Beijing 100084, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2022年 / 442卷

基金：

中国国家自然科学基金;

关键词：

Dynamic network; Waterborne polyurethane; H-bonding; Self-healing; MECHANICAL-PROPERTIES; COVALENT POLYMERS; EXCHANGE; REORGANIZATION; ALKOXYAMINES; ELASTOMER;

D O I：

10.1016/j.cej.2022.136204

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The implementation of the dynamic crosslinking network toward the commodity polymers such as polyurethane has been much highlighted for resource conservation and environmental protection. This work demonstrates a feasible dual dynamic network (DDN) construction of waterborne polyurethane (WPU) by using a biobased trifunctional ketose, 1,3-dihydroxyacetone (DHA) serving as the chain extender. The WPU dispersion was compatible well with the post-added adipic acid hydrazide (ADH) as the water soluble crosslinking agent. When the one-pot system of WPU-ADH was cast into films, covalent adaptive network (CAN) was formed through the condensation of ketohydrazine and carbonyl groups driven by the evaporation of water. The produced acylhydrazone groups would also contribute to the strengthen on the H-bonding crosslinking network. The synergism of the two sets of the networks provided not only the improved mechanical performances, but their > 95% recovery efficiencies on the 28 MPa of strength and 750% fracture elongation in the self-healing, reprocessing and welding tests under moderate heating. In addition, the WPU exhibited as an effective adhesive to metal with the adhesive strength sustained after four times of deconstruction-rebonding circles. The all commercially available components, feasible preparation together with the excellent and recoverable performances suggest an industrializable resolution for the sustainability of environmental friendly WPU materials.

引用

页数：12

共 62 条

[31] Optimizing the reversibility of hydrazone formation for dynamic combinatorial chemistry [J].