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A Study on Rheological Properties for Preparing Flow Mark Free PP Compounds  

Lee, Yong-Hee (Department of Applied Chemical Engineering, Korea University of Technology and Education)
Nam, Byeong-Uk (Department of Applied Chemical Engineering, Korea University of Technology and Education)
Lim, Jae-Gon (Samsung Total Petrochemical Co.)
Choi, Chi-Hoon (Hyundai-Kia Motor Co.)
Publication Information
Elastomers and Composites / v.44, no.2, 2009 , pp. 156-163 More about this Journal
Abstract
Our objective is to increase the flowability of Polypropylene(PP) compounds and achieve flow mark free surface in injection molded specimen. We have investigated flowabilities of PP compounds which were composed of PP, rubber, talc, and trace amount of additives. Flowability measurement was performed with four types PPs of which molecular weight distributions(MWD) and melt indexes(MI) were different. Rheological properties of the PP compounding materials, such as spiral flow(SF) length, MI, and shear viscosity, were evaluated. When PP with the broad MWD was used, there were remarkable cases where the spiral flow length of low MI PP compound was longer than that of higher MI PP compound. The PP compound having low MI but broad MWD PP has more flowability than the compound with only high MI.
Keywords
spiral flow; molecular weight distribution(MWD); melt index;
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Times Cited By KSCI : 2  (Citation Analysis)
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