期刊
MACROMOLECULES
卷 52, 期 11, 页码 4329-4340出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.9b00483
关键词
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资金
- National Natural Science Foundation of China [21875047]
- [61409220414/JZX7Y2019026206860]
The fabrication of SBS-g-COOH/ZnO composites cross-linked by Zn2+ salt-bondings was reported. First, SBS-g-COOH with different grafting ratio was synthesized through the thermally induced thiol ene click reaction, which was corroborated by FT-IR and H-1 NMR. Next, zinc oxide (ZnO) was added to coordinate with the carboxyl groups of SBS-g-COOH to obtain the Zn2+ salt-bondings. TEM images, demonstrating the ion-rich domains with size of 30-50 nm, substantiated the formation of Zn2+ salt-bondings and also exhibited that the size and density of ion domains increased with the increasing content of ZnO. The salt-bondings effectively enhanced the mechanical properties of SBS-g-COOH/ZnO composites, achieving a maximum tensile stress of 14.24 MPa at 100% strain and a Young's modulus of 14.19 MPa, which were almost 4.49 times and 4.35 times larger than that without ZnO, respectively. Simultaneously, the ionic networks cross-linked by salt-bondings endowed the composites with feasible shape memory behaviors that the best shape recovery ratio could be up to 97%.
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