Changes in Microphase-Separated Structures and Properties of an Elastomeric Block Copolymer Film upon Uniaxial Stretching as Analyzed by Conducting Simultaneous Measurements of Two-Dimensional Small-Angle X-Ray Scattering with Stress-Strain Tests
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- Uozumi Madoka
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology
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- Matsushita Tadashi
- Asahi Kasei Corporation
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- Sakamoto Naoki
- Asahi Kasei Corporation
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- Yamazaki Terumasa
- Asahi Kasei Corporation
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- Imaizumi Kimio
- Asahi Kasei Corporation
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- Li Lai
- Asahi Kasei Corporation
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- Urushihara Yoshimasa
- Hyogo-Prefectural Synchrotron Radiation Nanotechnology Laboratory, University of Hyogo
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- Kuwamoto Shigeo
- Hyogo-Prefectural Synchrotron Radiation Nanotechnology Laboratory, University of Hyogo
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- Masunaga Hiroyasu
- JASRI/SPring-8
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- Sasaki Sono
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology
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- Sakurai Shinichi
- Department of Biobased Materials Science, Graduate School of Science and Technology, Kyoto Institute of Technology
Bibliographic Information
- Other Title
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- 2次元小角X線散乱と応力-ひずみ同時測定によるエラストマー特性を有するブロックコポリマーフィルムの一軸延伸にともなう構造と物性の変化の研究
- 2ジゲン ショウカク Xセン サンラン ト オウリョク-ヒズミ ドウジ ソクテイ ニ ヨル エラストマー トクセイ オ ユウスル ブロックコポリマーフィルム ノ イチジク エンシン ニ トモナウ コウゾウ ト ブッセイ ノ ヘンカ ノ ケンキュウ
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Abstract
Simultaneous measurements of small-angle X-ray scattering with stress-strain tests were conducted to reveal changes in microphase-separated structures being correlated with changes in the mechanical properties upon the uniaxial stretching of an elastomeric block copolymer film containing glassy spherical microdomains embedded in the rubbery matrix. For this purpose, high brilliant synchrotron X-ray source was utilized at SPring-8, Japan, and cycled stretching-and-reversing process was conducted three times. While the tensile modulus decreased to be less than the half for the second cycle of the stretching, affine deformation for the changes in the microphase-separated structures was confirmed not only for the second but also for the third cycles. The Mullins effect (stress-induced softening) may be attributed to stress-induced disentangling of the soft-segment chains between two adjacent glassy spherical microdomains (as physical crosslinking points). It was found that the number density of the active network chain (νe ) is more than 22-times higher than that of the soft-segment chains between two adjacent glassy spherical microdomains (νe°) in the virgin sample. Such a big number of the active network chain suggests that the soft-segment chains between two adjacent glassy spherical microdomains are heavily entangled. Furthermore, it was found that the ratio νe /νe° is still around 10 for the second and third stretching cycles, suggesting that appreciable number of entanglements can be relaxed while comparable number of entanglements cannot be. The latter is so referred to as “trapped entanglement due to crosslinking”.
Journal
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- Nihon Reoroji Gakkaishi
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Nihon Reoroji Gakkaishi 43 (3_4), 77-83, 2015
The Society of Rheology, Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390001205094623616
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- NII Article ID
- 130005097262
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- NII Book ID
- AN00198812
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- ISSN
- 21864586
- 03871533
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- NDL BIB ID
- 026708780
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed