Synthesis and healing properties of poly(arylether sulfone)-poly(alkylthioether) multiblock copolymers containing disulfide bonds
| Autor: | Mitsutoshi Jikei, Yoshitaka Itoh, Akiyama Takayoshi, Akira Ushio, Kazuya Matsumoto, Yuya Kawaguchi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Organic Chemistry 02 engineering and technology Polymer Dynamic mechanical analysis 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Differential scanning calorimetry chemistry Polymerization Covalent bond Polymer chemistry Materials Chemistry Irradiation Thermoplastic elastomer 0210 nano-technology Glass transition |
| Zdroj: | Journal of Polymer Science Part A: Polymer Chemistry. 55:3545-3553 |
| ISSN: | 0887-624X |
| Popis: | Thermoplastic elastomers composed of soft and hard segments are important elastic and processable synthetic polymers. The microphase-separated soft domains show low glass transition temperature and possess sufficient chain mobility at room temperature. In this study, we report the synthesis and healing properties of multiblock copolymers containing disulfide bonds as dynamic covalent bonds. The multiblock copolymers composed of poly(arylether sulfone) and poly(alkylthioether) segments were synthesized by oxidative coupling polymerization of the corresponding thiol-terminated oligomers. Atomic force microscopy phase images, differential scanning calorimetry, and dynamic mechanical analysis curves indicated the microphase-separated morphology of the multiblock copolymer. Self-healing properties of the polymer were evaluated by changes in the elongation at break of the cut/adhered samples. The elongation recovery increased with UV irradiation time, and the multiblock copolymer showed a 93% recovery after UV irradiation for 5 h. The healing efficiency induced by UV irradiation, determined by subtracting the recovery without UV irradiation, was calculated to be 51%. According to the UV spectra and solubility changes after UV irradiation, the main healing factor in this study was the crosslinking reactions caused by thiyl radicals generated from UV irradiation instead of disulfide exchange reactions. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 3545–3553 |
| Databáze: | OpenAIRE |
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