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http://dx.doi.org/10.5762/KAIS.2013.14.3.1512

Control of Molecular Weight Properties of Polycarbonate using End Capping Agents  

Lee, Bom Yi (Division of Advanced Material Science, Kongju National University)
Kim, Youn Cheol (Division of Advanced Material Science, Kongju National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.14, no.3, 2013 , pp. 1512-1518 More about this Journal
Abstract
Polycarbonates (PCs) with six different end capping agents were synthesized from melt polymerization. Chemical structure of the synthesized PC was determined by FT-IR spectroscopy. The average molecular weight and distribution, glass transition and thermal degradation temperatures were determined by GPC, DSC and TGA. Average molecular weight changed with the chemical structure of end capping agent, and 4-tert-butylphenol was estimated as the optimum end capping agent. The average molecular weights of PCs decreased with the concentration of the agent, the number average molecular weight was observed as 20,000 - 30,000 when 0.05-0.15 mol% of 4-tert-butylphenol added in PCs. The melt viscosities and glass transition temperature of the PCs decreased with molecular weight. The change for adding method of the agent affected on both the molecular weight distribution and decrease in power law index.
Keywords
End Capping Agent; Molecular Weight Properties; Polycarbonate; Shear Thinning;
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Times Cited By KSCI : 2  (Citation Analysis)
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