Structural analysis of cross-linking structures in rubbers by zero-field solid-state 33S NMR

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05129
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 34020:Analytical chemistry-related
• Research Institution: Kochi University
• Principal Investigator: Yamada Kazuhiko 高知大学, 教育研究部総合科学系複合領域科学部門, 准教授 (80373380)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 加硫ゴム / 硫黄 / 無磁場固体NMR

Outline of Final Research Achievements

Since the discovery of vulcanized rubber in the 1830s, the range of rubber applications has expanded dramatically, including automotive tires. However, the cross-linking structure of rubber by sulfur atoms, which determines the macro physical properties of rubber, has not yet been clarified. The reason for this is that there has been no suitable analysis method to observe and analyze sulfur atoms in amorphous samples. In this study, we have developed a new methodology based on zero-magnetic field sulfur-33 nuclear magnetic resonance that enables local structure analysis of sulfur atoms even in amorphous samples including vulcanized rubber.

Free Research Field

分析化学

Academic Significance and Societal Importance of the Research Achievements

加硫ゴムの硫黄原子による架橋構造は長年に渡り明らかになっていなかった。本研究で開発した無磁場固体硫黄NMR法を活用することで、アモルファス試料における硫黄原子の定性・定量解析が可能になる。エラストマー研究において、革新的な分析手法を提供することができる。