2007 Fiscal Year Final Research Report Summary
Energy absorption mechanism of the semi-crystalline polyolefin during the yield process
| Project/Area Number |
18550188
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Polymer/Textile materials
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| Research Institution | Kanazawa University |
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Principal Investigator |
NITTA Koh-hei Kanazawa University, Graduate School of Science, Technology, Professor (70260560)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Kenji Kanazawa University, Graduate School of Science, Technology, Associate Professor (00216714)
KAWAMURA Takanobu Kanazawa University, Graduate School of Science, Technology, Assistant Professor (20377401)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Rheo-optics / Polvole fin / Fluorescent / Yield process / 降伏挙動 |
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| Research Abstract |
In this study, we mix the fluorescent reagent which does not form the excimer into polyolefines and investigate the fluorescent behavior in the yield region in-situ during uniaxial tensile deformation. We prepare the samples with different crystallinity to reveal the effects of the structural transformation of the crystalline phases on the fluorescent behavior in the yield region.
The intensity of fluorescence takes almost constant value before the yield point. The peak intensity suddenly rises up from the yield point and takes the maximum values around the central point between the yield point and the starting point of the neck propagation, so-called secondary yield point at which the neck portion appeared in the center of sample specimen. The peak intensity takes a constant value again during neck propagation. The excess emission of the fluorescence also increases with the crystallinity.
The total fluorescent emission linearly increases with the resilience for the HDPE samples and the iPP samples with the crystallinity over 0.5. This result strongly suggests that the origin of the excess fluorescent emission is the release of the storage energy by the fracture of the lamellae at the yield point.
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Research Products
(4 results)
