Resumo

COUTINHO, Fernanda M. B.; COSTA, Marcia P. M.; GUIMARAES, Maria José O. C.  e  SOARES, Bluma G.. Comparative study of different types of polybutadiene on the toughening of polystyrene. Polímeros [online]. 2007, vol.17, n.4, pp. 318-324. ISSN 0104-1428.  http://dx.doi.org/10.1590/S0104-14282007000400011.

In this work, an evaluation was made of the toughening of polystyrene (PS) with three types of polybutadiene (PB): low-cis polybutadiene (PB_l), high-cis polybutadiene (PB_h ) and styrene-butadiene block (SBS) copolymer (PB_co). The impact strength increased 138, 208 and 823% when low-cis polybutadiene, high-cis polybutadiene and styrene-butadiene block copolymer, were used, respectively. The materials presented dispersed morphology with domains smaller than 1 µm, randomly distributed in the polystyrene matrix. 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.

Palavras-chave : Toughening; polystyrene; polybutadiene; properties.