Preparation and characterization of high‐impact polystyrene using different types of polybutadiene |
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| Authors: | F M B Coutinho M P M Costa M J O C Guimarães B G Soares |
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| Affiliation: | 1. Departamento de Processos Químicos, Instituto de Química/UERJ, RJ, Brazil;2. Departamento de Processos Organicos, Escola de Química/UFRJ, RJ, Brazil;3. Instituto de Macromoléculas Professora Eloisa Mano/UFRJ, RJ, Brazil |
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| Abstract: | The mechanical, morphological, and rheological 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 (PBl), high‐cis polybutadiene (PBh), and styrene–butadiene block copolymer (PBco), 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. J Appl Polym Sci, 2008 |
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| Keywords: | toughening polystyrene polybutadiene polymer blends rheology |
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