Yan, Mengwen Cao, Liming Xu, Chuanhui Chen, Yukun Fabrication of “Zn<sup>2+</sup> Salt-Bondings” Cross-Linked SBS‑<i>g</i>‑COOH/ZnO Composites: Thiol–Ene Reaction Modification of SBS, Structure, High Modulus, and Shape Memory Properties The fabrication of SBS-<i>g</i>-COOH/ZnO composites cross-linked by Zn<sup>2+</sup> salt-bondings was reported. First, SBS-<i>g</i>-COOH with different grafting ratio was synthesized through the thermally induced thiol–ene click reaction, which was corroborated by FT-IR and <sup>1</sup>H NMR. Next, zinc oxide (ZnO) was added to coordinate with the carboxyl groups of SBS-<i>g</i>-COOH to obtain the Zn<sup>2+</sup> salt-bondings. TEM images, demonstrating the ion-rich domains with size of 30–50 nm, substantiated the formation of Zn<sup>2+</sup> 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-<i>g</i>-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%. FT-IR;shape memory behaviors;shape recovery ratio;1 H NMR;14.19 MPa;14.24 MPa;COOH;Zn;ZnO;High Modulus;ion domains;composite;TEM images;SBS;Shape Memory Properties;salt-bonding;ion-rich domains;4.35 times;4.49 times;zinc oxide;carboxyl groups;networks cross-linked 2019-05-20
    https://acs.figshare.com/articles/journal_contribution/Fabrication_of_Zn_sup_2_sup_Salt-Bondings_Cross-Linked_SBS_i_g_i_COOH_ZnO_Composites_Thiol_Ene_Reaction_Modification_of_SBS_Structure_High_Modulus_and_Shape_Memory_Properties/8153297
10.1021/acs.macromol.9b00483.s001