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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From Low-cis to High-cis, to High Vinyl Architecture: an Insight into Polybutadiene Rubber

B23 bacchelli

Event: 198th Technical Meeting - Fall 2020
Location: Virtual
Date: October 19, 2020
Author: Fabio Bacchelli
Paper Number: B23

Price: $20.00

  • Butadiene Rubber (BR) is commercially available in two main forms, one containing 1,4-cis repeating unit levels around 40%, which is called low-cis BR, and one with levels that range from 92 to 98%, called high-cis BR. Moreover, high-vinyl polybutadienes may be obtained, which contains pendent vinyl groups as a result of 1,2-polymerisation mechanisms. These rubbers had properties similar to those of SBR, different cure behaviour, and are used with a specific compounding strategy. In addition, besides traditional BR grades, using a proprietary technology, new Nd-based polybutadienes containing a specially designed branching architecture was produces, to optimize processing and performance at the same time. The molecular architecture able to conjugate those extremely different aspects was determined on the basis of polymer dynamics through linear viscoelastic relaxation time spectrum and nonlinear viscoelastic extensional rheology. By considering various recipes, advantages in terms of compound viscosity, filler incorporation and extrusion behavior are addressed together with usual testing parameters. The filler dispersion is commented on the basis of dynamic-mechanical approach.

    Papers from 198th Technical Meeting - Fall 2020

    Items from 198th Technical Meeting - Fall 2020