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Effect of Chemical Composition, Molecular Weight, Carbon Black Concentration and Temperature on the Flow Behavior of Styrene/Butyl Methacrylate Homo- and Co-polymer Particles  

Park, Moon-Soo (Department of Polymer Engineering, University of Suwon)
Moon, Ji-Yeon (Department of Polymer Engineering, University of Suwon)
Publication Information
Polymer(Korea) / v.35, no.1, 2011 , pp. 23-29 More about this Journal
Abstract
We measured shear viscosity of polymeric particles, prepared by suspension polymerization with hydrophobic silica as a stabilizer at $75^{\circ}C$, by a capillary rheometer. Shear viscosity displayed a non-Newtonian behavior with an increase in weight average molecular weight. Measurement of shear viscosity at 170 and $190^{\circ}C$ with copoly(styrene/butyl methacrylate) (co-PSB) particles by varying the ratio between styrene (St) and butyl methacrylate (BMA) showed that shear viscosity was a function of molecular weight, temperature and compositional ratio. When the ratio was 7/3, 5/5 and 3/7, shear viscosity slightly reduced with an increase in BMA concentration despite similar weight average molecular weights. We found that shear viscosity of copolymers with BMA concentrations exceeding 70% displayed a sharp reduction at high shear rates. It is speculated that increased PBMA chain length contributes to enhanced flowability of copolymers. When carbon black was incorporated into co-PSB, shear viscosity progressively increased with increasing carbon black concentration. The increase in shear viscosity, however, was less pronounced compared to the cases of molecular weight increase.
Keywords
shear viscosity; copoly(styrene/butyl methacrylate) particles; compositional ratio; carbon black; polymer composite particles;
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Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By Web Of Science : 0  (Related Records In Web of Science)
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