Effect of Molecular Weight of PEG Soft Segments on Photo-stimulated Self-healing Performance of Coumarin Functionalized Polyurethanes

Jun Ling; Min-zhi Rong; Ming-qiu Zhang

doi:10.1007/s10118-014-1522-x

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Effect of Molecular Weight of PEG Soft Segments on Photo-stimulated Self-healing Performance of Coumarin Functionalized Polyurethanes

PAPER | Updated：2021-06-21

- Effect of Molecular Weight of PEG Soft Segments on Photo-stimulated Self-healing Performance of Coumarin Functionalized Polyurethanes
- Chinese Journal of Polymer Science Vol. 32, Issue 10, Pages: 1286-1297(2014)
- Affiliations：
  
  a.Technology Centre, China Tobacco Yunnan Industrial Co., Ltd, Kunming 650231, China
  b.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
- Author bio：
  
  **Ming-qiu Zhang (章明秋), E-mail: ceszmq@mail.sysu.edu.cn
- Funds：
- DOI：10.1007/s10118-014-1522-x
  CLC：
- Received：07 May 2014，
  
  Revised：2014-06-10，
  
  Accepted：24 June 2014，
  
  Published：2014-10
- Accepted：
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Jun Ling, Min-zhi Rong, Ming-qiu Zhang. Effect of Molecular Weight of PEG Soft Segments on Photo-stimulated Self-healing Performance of Coumarin Functionalized Polyurethanes[J]. Chinese Journal of Polymer Science, 2014, 32(10): 1286-1297.
DOI：

Jun Ling, Min-zhi Rong, Ming-qiu Zhang. Effect of Molecular Weight of PEG Soft Segments on Photo-stimulated Self-healing Performance of Coumarin Functionalized Polyurethanes[J]. Chinese Journal of Polymer Science, 2014, 32(10): 1286-1297. DOI： 10.1007/s10118-014-1522-x.

摘要

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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