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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Rheological Characterization of Mixing Effects on Natural Rubber Using an RPA

D16 latshaw rheological characterization of mixing effects on natural rubber

Event: 196th Technical Meeting - Fall 2019
Location: Cleveland, OH
Date: October 08, 2019
Author: Alina Latshaw, David Bohnsack
Paper Number: D16

Price: $20.00

  • Physical and structural properties of the raw polymer lots used for rubber compounds dictate bulk compound behavior. The most influential factors include molecular weight, molecular weight distribution, and the degree of long-chain branching. Rheological characterization utilizing the Rubber Process Analyzer (RPA) provides a quick and easy method to obtain these properties, delivering a means to understand and develop polymer structure and bulk property relationships. The manufacturing process and mixing history have also been shown to affect rubber compound behaviors, such as processability, viscoelastic characteristics, curing properties, and physical properties of the fully cured product. Many of these differences are likely due to changes in the polymer microstructure brought about by processing operations. In this talk we will demonstrate the capabilities of the RPA for characterizing the viscoelastic properties of natural rubber compounds and will correlate them to changes in the polymer microstructure brought about by mixing protocols. In particular, previously-established methods will be used to evaluate three different classes of peptizers. The influence of peptizers on polymer microstructure will be evaluated and correlated to subsequent compound processing characteristics. This valuable information can further be used to predict processing behavior, allowing operators to make adjustments in advance, thereby increasing productivity and reducing scrap.

    Papers from 196th Technical Meeting - Fall 2019

    Items from 196th Technical Meeting - Fall 2019