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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Online Monitoring of Styrene Butadiene Copolymerization, Including a Final Coupling Reaction

A06 crosley paper

Event: 198th Technical Meeting - Fall 2020
Location: Virtual
Date: October 19, 2020
Author: Matthew Crosley
Paper Number: A06

Price: $20.00

  • A new unique method, ACOMP, of directly monitoring and measuring polymerization processes in real time was tested with SBR. ACOMP yields continuous data on important characteristics of the reaction and resulting polymers. The polymer properties include conversion, molecular weight, reduced viscosity, and shear thinning viscosity. The system yields continuous average values, such as Mw, rather than the intermittent molecular weight distributions (MWD) provided by GPC. The work detailed in this presentation, conducted in conjunction with Bridgestone Research Americas, outlines results obtained from the application of ACOMP to SBR reactions. ACOMP was used to continuously measure the anionic polymerization of styrene butadiene rubber (SBR) at the 20 L scale. The system successfully demonstrated that it can track conversion, along with weight average molecular weight (Mw), and low and high shear reduced viscosities (RV). After the initial reaction, the effects of the coupling agent were directly monitored by ACOMP. This showed a doubling in Mw over time and increases in RV commensurate with what one expects for random coils in a good solvent. ACOMP proved the capability of directly monitoring and characterizing polymer conversion, Mw, and RV of the polymers produced during a living, anionic solution based SBR polymerization process. This information is directly important with respect to characterizing the macromolecular polymer properties of Mw and RV, and it is also useful in providing insights into production rates and efficiencies, such as improving cycle time and yields while achieving product consistency from batch to batch.

    Papers from 198th Technical Meeting - Fall 2020

    Items from 198th Technical Meeting - Fall 2020