Change of entanglement and crystalline high-order structure of topological blend of cyclic and linear polymer during stretching process

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05186
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 35020:Polymer materials-related
• Research Institution: Okayama University
• Principal Investigator: YAMAZAKI Shinichi 岡山大学, 環境生命自然科学学域, 准教授 (40397873)
• Co-Investigator(Kenkyū-buntansha): 木村 邦生 岡山大学, 環境生命自然科学学域, 教授 (40274013) ; 新 史紀 岡山大学, 環境生命自然科学学域, 助教 (40723268)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 高分子構造・物性

Outline of Final Research Achievements

The purpose of this study is to understand the structural formation mechanisms during the stretching process by using a blend system where entanglement can be controlled through the mixing of cyclic and linear polymers. Cyclic and linear polymers were synthesized and evaluated, and the stress-strain behavior and changes in the crystalline structure during stretching were observed.
The stress-strain behavior of the samples was measured, and Raman scattering was analyzed before and after stretching. Changes in the Raman scattering peaks suggested that molecular chains were strongly oriented in the tensile direction after stretching. From the Raman scattering of deuterated cyclic polyethylene (PE) and hydrogenated linear PE blends, new insights were obtained into the relationship between molecular chain orientation and entanglement during the stretching process.

Free Research Field

高分子物理化学

Academic Significance and Societal Importance of the Research Achievements

本研究では、直鎖状高分子だけでは実現できない絡み合いトポロジーが結晶化に及ぼす影響を解明し、その成果を新規結晶性高分子材料の開発に展開していく点に高い学術的意義がある。本研究の成果は、従来ブロック化や共重合体化によって高性能化を指向してきたポリオレフィン類に対して発想の転換を迫るものであり、耐熱性や力学的強度、成形加工性などの諸物性がチューニング可能な高性能結晶性高分子材料を創製可能にするものである。用途展開としては、超高強度・高耐熱性繊維やナノコンポジット、配向制御高分子フィルム・膜への応用が考えられ、その波及効果は極めて大きい。