This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Scuracchio, C. H. Articles by Isayev, A. I. Search for Related Content Social Bookmarking                         What's this?

Blends of PS with SBR Devulcanized by Ultrasound: Rheology and Morphology

Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, SP, Brasil, aisayev{at}uakron.edu

R. E. S. Bretas

Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, SP, Brasil

A. I. Isayev

Department of Polymer Engineering, University of Akron, Akron, OH 44325-0301 USA

The rheological properties and the morphology of blends of styrene-butadiene rubber (SBR), devulcanizated by ultrasound (dSBR), with polystyrene (PS) were studied. A compatibilizer, a styrene-butadiene block copolymer (SBS) was also added to dSBR/PS blends. The shear viscosity at low and high shear rates, the complex dynamic viscosity and the creep behavior were measured. It was observed that the addition of the dSBR to the PS caused little change in the shear viscosity at high shear rates, decreased the die swell and increased the elastic recovery. The analysis of the dSBR particles in blends after capillary rheometry showed that their shapes were extremely irregular with their sizes decreased and distribution narrowed with increase in the amount of dSBR and the shear rate. The addition of SBS to the blends was found to be more efficient on decreasing the dSBR particle size at the lowest concentration of dSBR. Depending on the dSBR concentration, the dSBR particle sizes in the blends varied between 18 and 6 mm. Thus in order to achieve a toughening of PS by an addition of dSBR, their particle size should be further reduced by changing the devulcanization process conditions.

Key Words: blends • ultrasound devulcanization • SBR • PS • compatibilization

Journal of Elastomers and Plastics, Vol. 36, No. 1, 45-75 (2004)
DOI: 10.1177/0095244304039913


CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?

This article has been cited by other articles:

				O. Bianchi, R. Fiorio, J.N. Martins, A.J. Zattera, C.H. Scuracchio, and L.B. Canto Crosslinking Kinetics of Blends of Ethylene Vinyl Acetate and Ground Tire Rubber Journal of Elastomers and Plastics, March 1, 2009; 41(2): 175 - 189. [Abstract] [PDF]