2019 Fiscal Year Research-status Report
エピタキシャルな結晶成長を利用した分子鎖配向の高度な制御とその応用
| Project/Area Number |
18K14282
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| Research Institution | Japan Advanced Institute of Science and Technology |
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Principal Investigator |
ENTA Panitha 北陸先端科学技術大学院大学, 先端科学技術研究科, 助教 (10808653)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | Polypropylene / Nucleating agent / Molecular weight / Morphology / Mechanical anisotropy / Molecular orientation |
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| Outline of Annual Research Achievements |
Our research focused on the morphological development of an extruded polypropylene (PP) sheet containing the beta-nucleating agent, N,N’-dicyclohexyl-2,6-naphthalenedicarboxamide in the drawing process. We found that the plastic deformation mechanism is strongly dependent on the deformation direction. The molecular weight of polymer matrix influences the evolution of the void structure of an extruded sheet followed by stretching. Moreover, the needle-shaped nucleating agent, acting as defect points, is believed to have facilitated crazing with the formation of microvoids. These findings lead to further understanding of deformation behavior of crystalline polymers and provide the necessary information for the engineering of microporous films.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
We aim to widen the concept of orientation control of PP using the specific nucleating agent in both extrusion and injection-molding processes to obtain high-performance materials. The present research has focused on the effect of molecular weight of polymer matrix on microstructure and porosity that would be useful information in the field of microporous membranes for a battery separator. We suggest that the microporous film with uniform voids can be obtained using the appropriate molecular weight of PP under melt extrusion process followed by stretching. The anisotropy of both the crystalline phase and tie molecules between the crystallites is responsible for the anomalous morphologies during deformation. This research article is in the journal peer-review process.
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| Strategy for Future Research Activity |
Based on the impact of the concept of epitaxial crystallization on an anisotropic nucleating agent, we expect to expand this material design to not only PP but also any crystalline polymers such as polyester. The suitable technique should be improved and reviewed carefully to support to large scale industries with some effort in cost reduction and complicated product.
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