Technical Paper Archive


This site contains all papers presented at Rubber Division, ACS Technical Meetings from 2000-2018. Meetings prior to 2000 are incomplete and papers are added as they are digitized.


For older papers not listed here, please send your request, including Meeting Year, Title, Author, and Paper # to: cbrady@rubber.org


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Effect of Crosslinking Junctions as a Molecular Singularity Point on Mechanical Properties

Yamamoto  oraphin

Event: 185th Technical Meeting
Location: Louisville, KY
Date: March 24, 2014
Author: Oraphin Yamamoto
Paper Number:

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  • Presentation Slides.
    Molecular singularity of crosslinked natural rubber was proposed to be a significant crosslinking junction of the rubber, based on the assignment of NMR signals achieved in our previous work. It was found to play an important role in the most outstanding mechanical properties of the rubber, when the relationships between structure of the crosslinking junctions and mechanical properties for various crosslinked rubbers were investigated. The various crosslinked natural rubbers were prepared by conventional vulcanization (CV), efficient vulcanization (EV) and semi-efficient vulcanization (SemiEV) to be almost similar crosslink density. They were analyzed through solid-state NMR spectroscopy. The amount of tertiary carbons linking to sulfur of the CV rubber was the same as those of the EV and SemiEV rubbers, when the rubbers were analyzed by 1H-NMR spectroscopy. 13C-NMR spectroscopy revealed that the amount of quaternary carbons linking to sulfur of the CV rubber was largest among the rubbers. The mechanical properties of the CV rubber were the most excellent; hence, the quaternary carbons linking to sulfur as crosslinking junction was assigned to the molecular singularity.

    Papers from 185th Technical Meeting

    Items from 185th Technical Meeting