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A Study on the Rheological Properties of Branched Polycarbonates by Melt Polymerization  

Choi, Su-Jung (Polymer Engineering, Kongju National University)
Yoon, Kyung-Hwa (Polymer Engineering, Kongju National University)
Kim, Hee-Seung (R&D Center, Biemt corporation)
Yoo, Seung-Yoon (R&D Center, Biemt corporation)
Kim, Youn-Cheol (Polymer Engineering, Kongju National University)
Publication Information
Polymer(Korea) / v.35, no.4, 2011 , pp. 356-362 More about this Journal
Abstract
The branched polycarbonates (B-PCs) with two different branching agents were synthesized from melt polymerization. The contents of branching agent were in the range of 0.001~0.005 mol%. The chemical structure of the synthesized PC was determined by FTIR, $^1H$ NMR, and $^{13}C$ NMR, spectroscopy. The molecular weight, glass transition and degradation temperatures were determined by GPC, DSC, and TGA. The molecular weight of the phloro type B-PC had a lower value than the other one, and the glass transition temperature increased with molecular weight. Compared with linear PC, the rheological properties of the B-PC indicated an increase of complex viscosity in the low frequency region and shear thinning tendency. Power law index(n) representing shear thinning was calculated by linear regression and the values were in the range of 0.483~0.996. The rheological properties of the B-PCs were measured by a dynamic rheometer.
Keywords
melt polymerization; polycarbonate; branched; rheological properties;
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Times Cited By Web Of Science : 2  (Related Records In Web of Science)
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