Direct visualization of the molecular orientation and microstructure of glassy transparent polymers after the scratch test based on optical microscopy and X-ray scattering

Ken Kojio, Tomoko Kajiwara, Saburo Yamamoto, Aya Fujimoto, Kento Fukada, Chigusa Nagano, Shiori Masuda, Chao Hung Cheng, Shuhei Nozaki, Kazutaka Kamitani, Atsushi Takahara

研究成果: ジャーナルへの寄稿記事

抜粋

The scratch test was conducted for polycarbonate (PC) and poly(methyl methacrylate) (PMMA) with a load-progressive mode. Changes in the molecular aggregation structure of PC and PMMA induced by the scratch test were investigated based on polarized optical microscopic observation and small-angle X-ray scattering (SAXS) measurement. The scratching coefficient of friction (SCOF), the ratio of tangential load to normal load, of PC was much larger than that of PMMA. The width and depth of the damage on the scratch path was increased monotonically with the increase in the normal load. Hardness obtained by nanoindentation and microindentation tests were similar to those with SCOF, indicating that compression resistance mainly governs the scratch properties. The polarized optical microscopic images revealed that molecules were oriented from the edge to the center of the scratch path at a certain acute angle for both PC and PMMA. SAXS measurement revealed that microfibrils were formed along the direction of stress for PC.

元の言語英語
記事番号121773
ジャーナルpolymer
181
DOI
出版物ステータス出版済み - 10 24 2019

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All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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