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Extensional Flow Properties of Externally Plasticized Cellulose Acetate: Influence of Plasticizer Content
Department Bio-based Plastics, Fraunhofer Institute for Environmental, Safety, and Energy Technology UMSICHT, Osterfelder Straße 3, 46047 Oberhausen, Germany
Center of Engineering Sciences, Polymer Technology, Martin Luther University Halle-Wittenberg, 06099 Halle, Germany
* Author to whom correspondence should be addressed.
Received: 7 June 2013; Accepted: 24 June 2013 / Published: 2 July 2013
Abstract: Elongational flow properties of polymer melts are very important for numerous polymer processing technologies such as blown film extrusion or foam extrusion. Rheotens tests were conducted to investigate the influence of plasticizer content on elongational flow properties of cellulose acetate (CA). Triethyl citrate (TEC) was used as plasticizer. Melt strength decreases whereas melt extensibility increases with increasing plasticizer content. Melt strength was further studied as a function of zero shear viscosity. The typical draw resonance of the Rheotens curve shifts to higher drawdown velocity and the amplitude of the draw resonance decreases with increasing TEC content. With respect to foam extrusion, not only are melt strength and melt extensibility important but the elongational behavior at low strain rates and the area under the Rheotens curve are also significant. Therefore, elongational viscosity as well as specific energy input were calculated and investigated with respect to plasticizer content. Preliminary foam extrusion tests of externally plasticized CA using chemical blowing agents confirm the results from rheological characterization.
Keywords: biopolymers; cellulose acetate; plasticizer; foaming; rheotens test; melt strength
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MDPI and ACS Style
Zepnik, S.; Kabasci, S.; Kopitzky, R.; Radusch, H.-J.; Wodke, T. Extensional Flow Properties of Externally Plasticized Cellulose Acetate: Influence of Plasticizer Content. Polymers 2013, 5, 873-889.
Zepnik S, Kabasci S, Kopitzky R, Radusch H-J, Wodke T. Extensional Flow Properties of Externally Plasticized Cellulose Acetate: Influence of Plasticizer Content. Polymers. 2013; 5(3):873-889.
Zepnik, Stefan; Kabasci, Stephan; Kopitzky, Rodion; Radusch, Hans-Joachim; Wodke, Thomas. 2013. "Extensional Flow Properties of Externally Plasticized Cellulose Acetate: Influence of Plasticizer Content." Polymers 5, no. 3: 873-889.