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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Ring Polymers: A Topology to Control Properties of Elastomeric Materials

B36 helfer paper

Event: 198th Technical Meeting - Fall 2020
Location: Virtual
Date: October 19, 2020
Author: Carin Helfer
Paper Number: B36

Price: $20.00

  • The ability to synthesize polymers with various architectures enables properties to be tailored for numerous product applications. Polymer macrocycles, also known as ring polymers or circular polymers, have been attracting attention due to their possible unique properties because of the lack of chain ends. This feature may ultimately benefit tire technology by reducing rolling resistance and wear, without sacrificing traction. Two important contributions to rolling resistance are the Payne effect (filler interaction) and energy dissipation due to thermal motion of chain ends, which do not exist in ring polymers. However, synthesizing pure rings in large sample sizes has been difficult, which has limited a thorough analysis of polymer properties. A green chemistry method developed by Puskas and Rosenthal-Kim, known as Reversible Radical Recombination Polymerization (R3P), has produced the following high molecular weight, highly pure ring polymers in multigram quantities: poly(3,6-dioxa-1,8-octanedithiol) (poly(DODT)) and polyisobutylene-disulfide (PIB-SS). In further research, dithiothreitol (DTT) degraded the PIB-SS to a mixture of pentamer-to-dimer PIB-dithiols, creating a biodegradable PIB. More recently, the Puskas Lab has developed a technique using Liquid Chromatography at Critical Conditions (LCCC) to determine if the poly(DODT) and PIB-SS samples contain linear polymer contaminants. Collaborators at Texas Tech University are evaluating the rheological properties of poly(DODT) and PIB-SS, and CalTech will evaluate these polymers further using X-ray Photoelectron Spectroscopy. Current results on these unique polymers will be presented.

    Papers from 198th Technical Meeting - Fall 2020

    Items from 198th Technical Meeting - Fall 2020