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Effect of molecular weight of PEG soft segments on photo-stimulated self-healing performance of coumarin functionalized polyurethanes

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Abstract

Polyurethanes consisting of tri-functional homopolymer of hexamethylene diisocyanate (tri-HDI) and polyethylene glycol (PEG) are synthesized, in which photo-reversible coumarin moieties act as pendant groups. Accordingly, the polyurethanes can be repeatedly self-healed under UV lights at room temperature by taking advantages of the photodimerization and photocleavage habits of coumarin. Molecular weight of the soft segment, PEG, is found to be closely related to the healing performance of the polyurethanes. Lower molecular weight PEG that corresponds to higher initial coumarin concentration in the polymer is critical for obtaining higher healing efficiency in the case of the first healing action. Nevertheless, it does not guarantee high reversibility of the photo-remendability during the repeated healing events. In contrast, the polyurethane with moderate molecular weight PEG has achieved balanced performance. Reaction kinetics is less important for the healing effect.

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Authors and Affiliations

  1. Technology Centre, China Tobacco Yunnan Industrial Co., Ltd, Kunming, 650231, China

    Jun Ling

  2. Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, GD HPPC Lab, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, China

    Jun Ling, Min-zhi Rong & Ming-qiu Zhang  (章明秋)

Authors
  1. Jun Ling
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  2. Min-zhi Rong
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  3. Ming-qiu Zhang  (章明秋)
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Corresponding author

Correspondence to Ming-qiu Zhang  (章明秋).

Additional information

This work was financially supported by the National Natural Science Foundation of China (Nos. 51333008, 51273214 and 51073176), the project of key technological breakthrough for emerging industries of strategic importance (Nos. 2011A091102001, and 2011A091102003), the Science and Technology Program of Guangdong Province (Nos. 2010B010800021 and 2010A011300004) and the Basic Scientific Research Foundation in Colleges and Universities of Ministry of Education of China (No. 12lgjc08), and the ST project of Hongyun Honghe Tobacco Group (No. HYHH2013YL06).

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Ling, J., Rong, Mz. & Zhang, Mq. Effect of molecular weight of PEG soft segments on photo-stimulated self-healing performance of coumarin functionalized polyurethanes. Chin J Polym Sci 32, 1286–1297 (2014). https://doi.org/10.1007/s10118-014-1522-x

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  • DOI: https://doi.org/10.1007/s10118-014-1522-x

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