Preparation and characterization of high-impact polystyrene using different types of polybutadiene

被引：0
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作者：
Coutinho, F.M.B. [1 ]
Costa, M.P.M. [1 ]
Guimarães, M.J.O.C. [2 ]
Soares, B.G. [3 ]
机构：
[1] Departamento de Processos Químicos, Instituto de Química, UERJ, RJ, Brazil
[2] Departamento de Processos Orgânicos, Escola de Química, UFRJ, RJ, Brazil
[3] Instituto de Macromoléculas Professora Eloisa Mano, UFRJ, RJ, Brazil
来源：
Journal of Applied Polymer Science | 2008年 / 108卷 / 01期
关键词：
The mechanical; morphological; and Theological properties of polymer blends based on polystyrene (PS) and three different types of polybutadiene (PB) were studied. The polymer blends containing 20% of PB were processed in a Haake mixer at 180°C and 60 rpm for 6 min. The materials exhibited impact strength superior to that of the PS. An increase was observed in the impact strength of 138; 208; and; 823%; when low-cis polybutadiene (PB1); high-cis polybutadiene (PBh); and styrene-butadiene block copolymer (PB co); were respectively used. The materials presented dispersed morphology with polybutadiene domains; with sizes inferior to 1 μm; randomly distributed in the PS matrix. The viscous and storage moduli increased as the applied frequency increased. The flow activation energy; calculated by Arrhenius equation; varied from 34 to 71 kJ/mol. In the rheological experiments all polymer blends presented pseudoplastic behavior; showing decreasing viscosities as the shear rate increased. © 2007 Wiley Periodicals; Inc;
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页码：406 / 413
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