Advantages of bulge testing and rupture mechanism of glassy polymer films

Ken Kojio, Aya Fujimoto, Tomoko Kajiwara, Chigusa Nagano, Shiori Masuda, Chao Hung Cheng, Shuhei Nozaki, Kazutaka Kamitani, Hirohmi Watanabe, Atsushi Takahara

研究成果: ジャーナルへの寄稿記事

1 引用 (Scopus)

抄録

The advantages of bulge testing as a method of mechanical property analysis for polymer films was described. Deformation and rupture mechanisms of glassy polymer films during bulge testing were investigated by in situ molecular aggregation structure analyses. Heat-pressed polycarbonate (PC, weight-average molecular weight (Mw) = 38k) and poly(methyl methacrylate) (PMMA, Mw = 70k and 1.2 M (PMMA-70k and PMMA-1.2 M)) films were employed as transparent glassy polymers. Evaluations of molecular aggregation structures during bulge testing were conducted by polarized high-speed camera observation and wide-angle X-ray diffraction (WAXD) measurements. PC and PMMA-1.2 M films showed a yield point in their stress-strain curves, indicating ductility, while PMMA-70k film showed brittleness. WAXD measurements revealed that the distances between the main chains slightly increased with increasing strain. With increasing film strain above the yield point, a craze-like morphology with thinning of the film was seen for the PC film, likely due to the flexible PC molecules. Although it is difficult for PMMA molecules to orient along applied stress, a transition to the thinner state with the formation of wrinkled structures occurred for the PMMA-1.2 M film above the yield point. The transition to the thinner state, which corresponds to a discontinuous decrement of the cross-section area by deformation, might be categorized as two-dimensional crazing and/or shear deformation. PMMA-70k did not show such behavior because of the small number of entanglements. The use of a small amount of films in terms of thickness and size and the capability of observation of the entire film were given as advantages of the bulge test.

元の言語英語
記事番号121632
ジャーナルpolymer
179
DOI
出版物ステータス出版済み - 9 28 2019

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Polymethyl Methacrylate
Polymer films
Testing
polycarbonate
Agglomeration
Molecular weight
Crazing
X ray diffraction
Molecules
High speed cameras
Stress-strain curves
Brittleness
Polycarbonates
Polymethyl methacrylates
Shear deformation
Ductility
Polymers
Mechanical properties

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

これを引用

Advantages of bulge testing and rupture mechanism of glassy polymer films. / Kojio, Ken; Fujimoto, Aya; Kajiwara, Tomoko; Nagano, Chigusa; Masuda, Shiori; Cheng, Chao Hung; Nozaki, Shuhei; Kamitani, Kazutaka; Watanabe, Hirohmi; Takahara, Atsushi.

:: polymer, 巻 179, 121632, 28.09.2019.

研究成果: ジャーナルへの寄稿記事

Kojio, K, Fujimoto, A, Kajiwara, T, Nagano, C, Masuda, S, Cheng, CH, Nozaki, S, Kamitani, K, Watanabe, H & Takahara, A 2019, 'Advantages of bulge testing and rupture mechanism of glassy polymer films', polymer, 巻. 179, 121632. https://doi.org/10.1016/j.polymer.2019.121632
Kojio K, Fujimoto A, Kajiwara T, Nagano C, Masuda S, Cheng CH その他. Advantages of bulge testing and rupture mechanism of glassy polymer films. polymer. 2019 9 28;179. 121632. https://doi.org/10.1016/j.polymer.2019.121632
Kojio, Ken ; Fujimoto, Aya ; Kajiwara, Tomoko ; Nagano, Chigusa ; Masuda, Shiori ; Cheng, Chao Hung ; Nozaki, Shuhei ; Kamitani, Kazutaka ; Watanabe, Hirohmi ; Takahara, Atsushi. / Advantages of bulge testing and rupture mechanism of glassy polymer films. :: polymer. 2019 ; 巻 179.
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abstract = "The advantages of bulge testing as a method of mechanical property analysis for polymer films was described. Deformation and rupture mechanisms of glassy polymer films during bulge testing were investigated by in situ molecular aggregation structure analyses. Heat-pressed polycarbonate (PC, weight-average molecular weight (Mw) = 38k) and poly(methyl methacrylate) (PMMA, Mw = 70k and 1.2 M (PMMA-70k and PMMA-1.2 M)) films were employed as transparent glassy polymers. Evaluations of molecular aggregation structures during bulge testing were conducted by polarized high-speed camera observation and wide-angle X-ray diffraction (WAXD) measurements. PC and PMMA-1.2 M films showed a yield point in their stress-strain curves, indicating ductility, while PMMA-70k film showed brittleness. WAXD measurements revealed that the distances between the main chains slightly increased with increasing strain. With increasing film strain above the yield point, a craze-like morphology with thinning of the film was seen for the PC film, likely due to the flexible PC molecules. Although it is difficult for PMMA molecules to orient along applied stress, a transition to the thinner state with the formation of wrinkled structures occurred for the PMMA-1.2 M film above the yield point. The transition to the thinner state, which corresponds to a discontinuous decrement of the cross-section area by deformation, might be categorized as two-dimensional crazing and/or shear deformation. PMMA-70k did not show such behavior because of the small number of entanglements. The use of a small amount of films in terms of thickness and size and the capability of observation of the entire film were given as advantages of the bulge test.",
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AU - Masuda, Shiori

AU - Cheng, Chao Hung

AU - Nozaki, Shuhei

AU - Kamitani, Kazutaka

AU - Watanabe, Hirohmi

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