Manufacturing Technology 2019, 19(3):404-408 | DOI: 10.21062/ujep/304.2019/a/1213-2489/MT/19/3/404

Effect of the Pigment Concentration on the Dimensional Stability and the Melt Flow Index of Polycarbonate

Vaclav Janostik, Michal Stanek, Vojtech Senkerik, Petr Fluxa, Lenka Hylova
Faculty of Technology, Tomas Bata University in Zlin. Vavreckova 275, 760 01 Zlin. Czech Republic

This study is focused on the effect of pigments on polycarbonate (PC), especially the dimensional stability and flow properties of this material. This polymer is commonly used in the plastics industry and the most common processing of this polymer is injection molding technology. Three different pigments made by Lifocolor company were selected for PC staining. In addition, six different concentrations of aforementioned pigments were used. It is worthwhile to note that the pigments in the polymer matrix acted as a filler. Just like fillers, the pigments also influence the shrinkage of the polymer in both the main and secondary directions. The paper also deals with the effect of pigment concentration on the melt index (MFI). It was shown that the presence of pigments reduces the thermal mobility of the macromolecular chain. Melt flow index changes were also directly tied to the changes of the viscosity, which was also affected by the pigments. It can be expected that the viscosity might not remain the same even at varying shear rates.

Keywords: Injection moulding, shrinkage, dimensional stability, pigment concentration, melt flow index
Grants and funding:

Internal grant of TBU in Zlin No. IGA/FT/2019/002 funded from the resources of specific university research and by the Ministry of Education, Youth and Sports of the Czech Republic within the National Sustainability Programme project No. LO1303 (MSMT-7778/2014).
European Regional Development Fund under the project CEBIA-Tech No. CZ.1.05/2.1.00/19.0376.

Published: June 1, 2019  Show citation

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Janostik V, Stanek M, Senkerik V, Fluxa P, Hylova L. Effect of the Pigment Concentration on the Dimensional Stability and the Melt Flow Index of Polycarbonate. Manufacturing Technology. 2019;19(3):404-408. doi: 10.21062/ujep/304.2019/a/1213-2489/MT/19/3/404.
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