Technical Information Magazine 201908-01 Sulfur Crosslinking Decomposition Method for Vulcanized Rubber
The technical information magazine The TRC News provides the latest information on analytical techniques that are useful for research and development, solving production troubles, and quality control.
**Abstract** Vulcanized rubber (natural rubber: NR, styrene-butadiene rubber: SBR, etc.) has been difficult to analyze chemically due to its insolubility in solvents. Therefore, by introducing a technique to cleave the sulfur cross-links that cause this insolubility and solubilize the rubber components, it has become possible to apply solution NMR and GPC, which are essential for structural analysis and physical property measurement of high molecular weight substances that were previously unattainable. This allows for more detailed analytical evaluations when combined with conventional methods. This paper presents examples of structural analysis and degradation analysis of vulcanized natural rubber. **Table of Contents** 1. Introduction 2. Cleavage of Sulfur Cross-links 3. Analysis of Vulcanized Natural Rubber 4. Application to Degradation Analysis 5. Conclusion
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Technical Information Magazine The TRC News "Analysis of Vulcanized Rubber Using Sulfur Crosslink Decomposition Method" [Abstract] Vulcanized rubber (natural rubber: NR, styrene-butadiene rubber: SBR, etc.) is insoluble in solvents, making adequate chemical analysis difficult until now. Therefore, by introducing a technique to cleave the sulfur crosslink bonds that cause insolubility, the rubber components can be solubilized, allowing the application of solution NMR and GPC, which are essential for structural analysis and physical property measurement of high molecular weight substances that were previously impossible. Combined with conventional methods, more detailed analytical evaluations have become possible. This paper presents examples of structural analysis and degradation analysis of vulcanized natural rubber. [Table of Contents] 1. Introduction 2. Cleavage of Sulfur Crosslink Bonds 3. Analysis of Vulcanized Natural Rubber 4. Application to Degradation Analysis 5. Conclusion [Figures and Tables] Figure 1 to Figure 12 Chemical decomposition schematic Before and after decomposition Example of analysis procedure flowchart IR spectrum Solid 13C NMR spectrum TG curve IR spectrum of filler IR spectrum of rubber components Solution 13C NMR spectrum of rubber components Molecular weight distribution of new products Molecular weight distribution of brittle products Table 1 Molecular weight information
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At Toray Research Center, Inc., we provide technical support through analytical techniques and physical property analysis to address various challenges in research and development as well as production fields via contract analysis. Based on our long-standing achievements and extensive experience in analysis and physical property evaluation, we continue to strive to meet the advanced and diverse needs of our customers.
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