Details of a Researcher - Shibata Shinichi

Shibata Shinichi

写真a

Title	Professor
Researcher Number(JSPS Kakenhi)	70274884

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Current Affiliation Organization 【 display / non-display 】

Duty University of the Ryukyus Faculty of Engineering School of Engineering_Mechanical Engineering Program Professor
Concurrently University of the Ryukyus Graduate School of Engineering and Science Solid Mechanics and Materials Engineering Professor

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Academic degree 【 display / non-display 】

Niigata University - Doctor (Engineering)

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External Career 【 display / non-display 】

2006.08

　

　

University of the Ryukyus, Faculty of Engineering, Department of Mechanical Systems Engineering, Engineering Materials,Design and Processing, Associate Professor

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Research Interests 【 display / non-display 】

Injection Molding,Polymer Engineering,Composite Material

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Research Areas 【 display / non-display 】

Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Transport phenomena and unit operations
Nanotechnology/Materials / Material processing and microstructure control

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Research Theme 【 display / non-display 】

Polymerization of Poly Lactic Acid by Direct Polycondensation
Polymerization of poly lactic acid by ROP

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Published Papers 【 display / non-display 】

Effect of 9,9′-Bis(aryl)fluorene-modified Nanocellulose, Bamboo, and Bagasse Fibers on Mechanical Properties of Various Polymer Composites

Takumi Takeuchi, Panuwat Luengrojanakul, Hiroshi Ito, Sarawut Rimdusit, and Shinichi Shibata

Bioresources 20 ( 2 ) 4136 - 4151 2025.04 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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Impact-resistant automotive componentswere studiedby evaluating the effects of single-screw and twin-screw extrusion on the mechanical properties of composites made from fluorene-modified nanocellulose (FCF) or bamboo fibers (30 wt%) combined with various polymers. Natural fiber composites were injection molded, and their mechanical properties were evaluated.Results showed that fluorene-modified nanocellulose exhibited improved dispersion when kneaded with polycarbonateand polyamide 6 using twin-screw extrusion, resulting in increases of over 5000 MPa in flexural modulus and over 40 MPa in maximum flexural stress compared to the base polymer. However, composites made with polyamide 66and bamboo fibers required high injection molding temperatures exceeding 260°C, which led to thermal degradation and reduced the fiber reinforcement effect on mechanical properties.The polypropyleneshowed weak interfacial compatibility with bamboo fibers, resulting in limited reinforcement effectsin both single and twin-screw extrusion. The brittleness of the fibers didnot significantly influence the elongation of the PP composite.Nonetheless, it exhibited less reduction in elongation compared to composites where bamboo or FCF was added to other polymers. Building on these results, flexuraltests wereconducted on composites combining high-impact polypropylenewith naturalfibers, demonstrating the potential for high-impact-resistant composite materials suitable for automotive applications
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Effect of processing temperature and polymer types on mechanical properties of bamboo fiber composites

Takumi Takeuchi, Panuwat Luengroajnaku, Hiroshi Ito, Sarawut Rimdusit, Shinichi Shibata

Bioresources 19 ( 1 ) 41 - 52 2023.11 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
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Exploring the Prospects of Macadamia Nutshells for Bio-Synthetic Polymer Composites: A Review

Md Sefat Kahn, Md Mainul Islam, Jayantha Epaarachchi, Shinichi Shibata

Polymers 15 ( 19 ) 4007 - 4021 2023.10 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
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Investigating the Characteristics of a Natural Fiber Composite Fabrication from 9,9′-Bis(aryl)fluorene-modified Nanocellulose Bamboo Fiber

Khan Md Sefat, Takashi Kurose, Masahiro Yamada, Hiroshi Ito, Shinichi Shibata

Bioresources 17 ( 3 ) 4559 - 4567 2022.06 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)
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Fabrication of 9,9′-Bis(aryl)fluorene-modified Nanocellulose Bamboo Fiber Composite

Khan Md Sefat, Takashi Kurose, Masahiro Yamada, Hiroshi Ito, Shinichi Shibata

Bioresources 16 ( 2 ) 3907 - 3915 2021.04 [ Peer Review Accepted ]

Type of publication: Research paper (scientific journal)

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In this study, a green composite was fabricated using bamboo fiber and 9,9′-bis(aryl)fluorene-modified cellulose nanofiber (FCNF). Cellulose nanofiber (CNF) and finely crushed bamboo fiber (CBF) were also used as binders. The mechanical properties of the composites were compared. The results showed that the FCNF-bamboo fiber composite had the maximum flexural strength among these binders. This result was likely due to strong bonding by chemical reactions among fibers and the FCNF. The effect of fiber orientation accuracy on the mechanical properties of the composites was also investigated. When the bamboo fibers were carefully aligned, without fibers crossing each other, the mechanical properties increased by two times, compared to the composites with fibers crossing each other. In the accurately aligned bamboo composites, the cross sections of the fibers were largely deformed by compression stress during hot-press forming. Thus, the gaps among fibers decreased, and interfacial adherence was improved. The effect of fabrication temperature on the mechanical properties of the FCNF-bamboo composite was also examined. It was found that the maximum flexural modulus and strength of the composites were at approximately 250 °C, and the mechanical properties rapidly decreased above 270 °C due to thermal degradation of the bamboo fiber.