Chemical and Biomolecular Engineering Faculty Research

Title

Filler Dispersion in Hyperbranched Polyisobutylene

Document Type

Article

Publication Date

5-2004

Abstract

The microdispersion of carbon black filler in linear and hyperbranched polyisobutylene (PIB) was assessed from dynamic mechanical and volume resistivity measurements. While no significant differences were observed in the carbon black concentration necessary for formation of a filler network, in comparison to the linear polymer, the highly branched PIB was found to have substantially more carbon black agglomeration. This occurs despite its higher viscosity, due to the relative inaccessibility of large portions of the molecule, as a result of the profuse treelike branching. The consequence is more extensive interaggregate interaction, and thus a larger Payne effect and greater mechanical hysteresis.

Publication Title

Rubber Chemistry and Technology

Volume

77

Issue

2

First Page

372

Last Page

379