論文

査読有り
2019年2月

Direct Evaluation of Local Dynamic Viscoelastic Properties of Isotactic Polypropylene Films Based on a Dynamic μ-Beam X-ray Diffraction Method

ACS Macro Letters
  • Shuhei Nozaki
  • ,
  • Shiori Masuda
  • ,
  • Chao Hung Cheng
  • ,
  • Chigusa Nagano
  • ,
  • Kazutoshi Yokomachi
  • ,
  • Kazutaka Kamitani
  • ,
  • Kohki Aoyama
  • ,
  • Hiroyasu Masunaga
  • ,
  • Ken Kojio
  • ,
  • Atsushi Takahara

8
2
開始ページ
218
終了ページ
222
記述言語
英語
掲載種別
DOI
10.1021/acsmacrolett.8b00994

The local mechanical properties of crystalline polymer were evaluated using synchrotron radiation X-ray diffraction with 10 μm lateral resolution. A nonoriented isotactic polypropylene (iPP) film with isolated spherulites in a crystallized matrix was used as a model sample. In situ wide-angle X-ray diffraction (WAXD) measurement was performed on the iPP film using a microbeam synchrotron radiation X-ray under sinusoidal strain. The lattice spacing of the crystal planes increased and decreased in response to the applied sinusoidal strain. Local dynamic viscoelastic functions (dynamic storage and loss moduli (E′ and E″)) were calculated at room temperature from the relationship between the calculated applied stress and the response strain obtained by dynamic μ-beam WAXD measurement inside and outside of the spherulites. The E′ values inside and outside of spherulite obtained from the change in spacing of the (110) plane were 1.8 and 1.1 GPa, respectively. Furthermore, the E′ value inside of spherulite obtained from the change in spacing of the (113) plane was 6.0 GPa. These values can be explained by the deformation of crystallite, which depends on the direction of crystal planes. The results obtained here revealed that synchrotron radiation X-ray diffraction measurement gives not only structural information but also the local mechanical properties of the materials E′.

リンク情報
DOI
https://doi.org/10.1021/acsmacrolett.8b00994
ID情報
  • DOI : 10.1021/acsmacrolett.8b00994

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