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http://dx.doi.org/10.14478/ace.2011.22.6.679

A Study on the Rheological Properties of Branched Polypropylene/silicate Composites  

Dahal, Prashanta (Department of Environment Engineering, Kongju National University)
Yoon, Kyung Hwa (Department of Environment Engineering, Kongju National University)
Kim, Youn Cheol (Department of Environment Engineering, Kongju National University)
Publication Information
Applied Chemistry for Engineering / v.22, no.6, 2011 , pp. 679-684 More about this Journal
Abstract
Branched polypropylenes (LCB-PP) with a long chain branch were prepared by the solid-state and molt-state reaction. Divinylbenzene (DVB), 1,4-benzenediol (RES), and furfuryl sulphide (FS) were used as branching agents of fabricate LCB-PP/silicate composites. Chemical structures, thermal properties, and rheological properties of the LCB-PP were determined by FT-IR, DSC, TGA, and dynamic rheometer (ARES). The chemical structure of the LCB-PP was confirmed by the existence of =C-H stretching peak of the branching agent at $3100cm^{-1}$. From DSC and TGA results, the melting reaction was more effective than the solid state reaction in the manufacture of LCB-PP, which was additionally certified by rheological properties. Based on rheological properties, FS was the best for branching efficiency of PP. Compared to PP, LCB-PPs indicated an increase of complex viscosity in the low frequency and shear thinning tendency, and G'-G" plot represented an increase in elasticity and the heterogeneousness in a melt state. Rheological properties of LCB-PP/silicate composites were observed with the silicate content. When 5 wt% silicate was added in LCB-PP, distinct changes in the shear thinning and the slope of G'-G" plots were observed.
Keywords
polypropylene; long chain branch; silicate; rheological property;
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