4.8 Article

Crystallization-induced mechanofluorescence for visualization of polymer crystallization

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NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -

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NATURE RESEARCH
DOI: 10.1038/s41467-020-20366-y

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  1. KAKENHI from the Japan Society for the Promotion of Science (JSPS) [17H01205]
  2. JST CREST [JPMJCR1991]
  3. JST ERATO [JPMJER1602]
  4. JSPS Research Fellowships for Young Scientists [19J23009]
  5. Grants-in-Aid for Scientific Research [19J23009] Funding Source: KAKEN

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By introducing tetraarylsuccinonitrile (TASN) into crystalline polymers, researchers were able to visualize and evaluate the stress caused by micro-mechanical forces during polymer crystallization using fluorescence microscopy and electron paramagnetic resonance. This study provides a new method for studying residual stress in polymeric materials.
The growth of lamellar crystals has been studied in particular for spherulites in polymeric materials. Even though such spherulitic structures and their growth are of crucial importance for the mechanical and optical properties of the resulting polymeric materials, several issues regarding the residual stress remain unresolved in the wider context of crystal growth. To gain further insight into micro-mechanical forces during the crystallization process of lamellar crystals in polymeric materials, herein, we introduce tetraarylsuccinonitrile (TASN), which generates relatively stable radicals with yellow fluorescence upon homolytic cleavage at the central C-C bond in response to mechanical stress, into crystalline polymers. The obtained crystalline polymers with TASN at the center of the polymer chain allow not only to visualize the stress arising from micro-mechanical forces during polymer crystallization via fluorescence microscopy but also to evaluate the micro-mechanical forces upon growing polymer lamellar crystals by electron paramagnetic resonance, which is able to detect the radicals generated during polymer crystallization. Residual stress in crystalline polymers can lead to material failure, but currently methods which can quantify residual stress in such materials are lacking. Here, by using fluorescent-type mechanochromophores, the authors develop a method to visualize and quantify low degrees of stress that arises from micro-mechanical forces during polymer crystallization.

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