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Reduction of cycle times in injection molding of PLA through bio-based nucleating agents

An approach to reduce cycle times in injection molding of poly (lactic acid) through use of bio-based nucleating agents is presented. Talc is commonly used as nucleant and will be used as a reference in this study. The other investigated additives are kraft lignin, lignosulfonate, and carbon black. This is an in-depth study of certain bio-based nucleating agents for use with poly (lactic acid) under various processing conditions.

Bio-based compounds of poly (lactic acid) and different nucleating agents were produced via twin-screw extrusion. Subsequent injection molding yielded standard samples for tensile testing; cycle times were recorded during injection molding. Thermal and mechanical testing showed direct dependence upon degree of crystallinity in the matrix polymer. The ability of certain bio-based nucleating agents (e.g. kraft lignin) to reduce the cycle time in injection molding was proven.

» Author: Hendrik Schäfer, Claudia Pretschuh, Oliver Brüggemann

» Reference: 10.1016/j.eurpolymj.2019.03.011

» Publication Date: 07/03/2019

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This project has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° [605658].

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