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Difficulties in the Use of Ground Bacterial Cellulose (BC) as Reinforcement of Polylactid Acid (PLA) Using Melt-Mixing and Extrusion Technologies

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Author(s): Katrin Ganß | Axel Nechwatal | Katrin Frankenfeld | Kerstin Schlufter

Journal: Open Journal of Composite Materials
ISSN 2164-5612

Volume: 02;
Issue: 03;
Start page: 97;
Date: 2012;
Original page

Keywords: Polymer-Matrix Composite | Extrusion | Bacterial Cellulose

ABSTRACT
Bacterial cellulose (BC) was ground to make the material suitable for compounding with polylactid acid (PLA). The content of BC in PLA was changed between 5 and 20 wt%. By increasing the BC content of the composite DSC measurements showed an increase of crystallinity (χ c ). Annealing at 90?C resulted in a further increase of χ c . Analysis of the dynamic mechanical behavior showed a sharp decline of the storage module (G’) above the glass transition temperature (T g ) while such a sharp decline did not occur for annealed samples. This indicates that the stiffness of PLA even above T g can be improved by BC and annealing.
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