Neljapäeval, 16. mail 2019 kell 16.15 toimub Physicumis W.Ostwaldi 1 seminariruumis D312
Erakorraline Laserspektroskoopia seminar No 271
Tõnis Paara1, Sven Lange1, Kristjan Saal1, Andres Krumme2
1Institute of Physics, University of Tartu, W.Ostwaldi 1, 50411 Tartu, Estonia
2Department of Polymeric Materials, Tallinn University of Technology, Ehitajate tee 5, Tallinn, Estonia
USING NANO-ADDITIVES TO INCREASE THE OXYGEN BARRIER OF POLYMERS
The aim of this work is to add nanoclay particles into polyamide (PA) matrix in order to increase its gas barrier properties. The nanoclay nanoparticles can form a tortuous path for the permeant molecules, thus increasing their diffusion length. In current work, nanoclay was mixed into the PA matrix by using a twin screw extruder with a backflow channel. The latter generates shear forces needed for exfoliation of naturally agglomerated nanoclay platelets. Oxygen transmission rate (OTR) and mechanical properties of thin film with 100 μm thickness made out of the blend were measured and compared against pristine polymer. We show that the simple melt mixing of nanoclay reduces OTR while affecting, only to a moderate degree, the mechanical and optical properties of the original polymer film, hinting an easy path to industrial application in the food packaging industry. The exfoliation and orientation of the nanoclay within the polymer film are shown to be partial.