Browse > Article

A Study on the Molecular Weight Control and Rheological Properties of Branched Polycarbonate  

Lee, Bom Yi (Major in Polymer Engineering, Kongju National University)
Dahal, Prashanta (Major in Polymer Engineering, Kongju National University)
Kim, Hee Seung (R&D Center, Biemt corporation)
Yoo, Seung Yoon (R&D Center, Biemt corporation)
Kim, Youn Cheol (Major in Polymer Engineering, Kongju National University)
Publication Information
Applied Chemistry for Engineering / v.23, no.4, 2012 , pp. 388-393 More about this Journal
Abstract
Branched polycarbonates (B-PCs) were synthesized using melt polymerization method with four different end capping agents and vaying concentrations. The chemical structure of the synthesized PC was determined by FT-IR and $^{1}H-NMR$ spectroscopy, and the reaction of the end capping agent was confirmed by the existence of hydroxy group in FT-IR spectrum. The average molecular weight and distribution, glass transition and degradation temperatures were determined by GPC, DSC and TGA. The 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 B-PCs decreased with the increase of the concentration of the agent, the number average molecular weight represented 20000 when 0.05 mol% of 4-tert-butylphenol was added to B-PCs. The melt viscosities of the B-PCs decreased with the decrease of the molecular weight of B-PCs, and adding of the agent was not effected to shear thinning tendency.
Keywords
polycarbonate; end capping agent; molecular wight and distribution; rheological properties;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 J. M. Perez, J. L. Vilas, J. M. Laza, S. Arnaiz, F. Mijangos, E. Bilbao, M. Rodriguez, and L. M. Leos, J. Mat. Process Tech., 210, 727 (2010).   DOI   ScienceOn
2 H. I. Lee and J. S. Lee, Polym. Sci. Tech., 4, 423 (1993).
3 M. Diepens and P. Gijsman, Polym. Degrad. Stabil., 94, 1808 (2009).   DOI   ScienceOn
4 Y. J. Mergler, R. J. van Kampen, W. J. Nautaa, R. P. Schaake, B. Raas, J. G. H. van Griensven, and C. J. M. Meesters, Wear, 258, 915 (2005).   DOI   ScienceOn
5 Bayer, Korean Patent, 10-2011-0013394.
6 Cheilmosik, Korean Patent, 10-0888621.
7 LG chemical, Korean Patent, 10-2005-0101794.
8 S. J. Choi, K. H. Yoon, I. H. Hwang, C. Y. Lee, H. S. Kim, S. Y. Yoo, and Y. C. Kim, Appl. Chem. Eng., 21, 532 (2010).
9 S. J. Choi, K. H. Yoon, H. S. Kim, S. Y. Yoo, and Y. C. Kim, Polymer (Korea)., 35, 356 (2011).
10 K. C. Choi, E. K. Lee, S. Y. Choi, and S. J. Park, J. Korean Ind. Eng. Chem., 13, 1 (2002).
11 A. C. Hagenaars, J.-J. Pesce, C. Bailly, and B. A Wolf, Polymer, 42, 7653 (2001).   DOI   ScienceOn
12 M. Sugimoto, Y. Suzuki, K. Hyun, K. H, Ahn, T. Ushioda, A. Nishioka, T. Taniguchi, and K. Koyama, Rheol Acta, 46, 33 (2006).   DOI   ScienceOn