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SBS Thermoplastic Elastomer Based on Dynamic Metal‐Ligand Bond: Structure, Mechanical Properties, and Shape Memory Behavior
Author(s) -
Wang Qiang,
He Yu,
Li Qiuying,
Wu Chifei
Publication year - 2021
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.202000737
Subject(s) - materials science , elastomer , x ray photoelectron spectroscopy , composite material , fourier transform infrared spectroscopy , thermoplastic elastomer , scanning electron microscope , composite number , polymer chemistry , chemical engineering , polymer , copolymer , engineering
A Cooper(II) (Cu 2+ )‐nitrogen coordination‐crosslinked network is designed in poly(styrene‐co‐butadiene‐co‐styrene) (SBS) to change commercial elastomers into advanced soft materials. Herein, ligand groups into SBS molecular chains by the 3,6‐di(2‐pyridyl)‐1,2,4,5‐tetrazine (DPT) click reaction are first introduced. The results from fourier transform infrared (FT‐IR), 1H‐nuclear magnetic resonance, and X‐ray photoelectron spectroscopy (XPS) are verified the successful modification of SBS. The DPT‐grafted SBS could then coordinate with copper sulfate (CuSO 4 ) to form a Cu 2+ ‐nitrogen bond, which is further characterized using FT‐IR, XPS, atomic force microscope, scanning electron microscope, and geometric structure calculations. After modifying SBS to form an SBS‐DPT/CuSO 4 composite (SBS‐DPT2‐Cu10), the tensile stress is improved from 11.43 to 23.25 MPa, while the elongation at break is remained almost unchanged, and the corresponding toughness is increased from 33.21 to 63.26 MJ m –3 . Moreover, the dynamic nature of the Cu 2+ ‐nitrogen coordination bonds enables the SBS‐DPT/CuSO 4 composite to exhibit sustained thermoplastic performance and excellent shape memory behavior under an external thermal stimulus.