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Resistance of poly(lactic acid)/starch composites to weathering effects

Goetjes, Victoria
Zarges, Jan-Christoph
Heim, Hans-Peter

In order to produce a completely bio-based and cost-effective filled polymer, PLA and native potato starch as a filler were compounded by twin screw extrusion. Subsequently injection molded test specimens were manufactured and subjected to artificial weathering as well as different storages (high temperature, high humidity, freeze, water) for 504 h with a view to long-term resistance. Depending on the starch content a significant reduction of up to 100% in tensile strength can be seen, as the starch accelerates or inhibits the triggered aging effects. As a result of the influence of humidity and water as well as artificial weathering, stress cracks are formed in starch-containing samples. Storage at an elevated temperature (70°C, 50% RH) leads to polymer degradation of the PLA. This degradation can be inhibited by the addition of starch. Freezing storage has no significant influence on the mechanical and structural properties of the PLA starch composites.

Sponsor
Gefördert im Rahmen des Projekts DEAL
Citation
In: Journal of Applied Polymer Science Volume 141 / Issue 2 (2023-10-06) , S. ; eissn:1097-4628
Collections
@article{doi:10.17170/kobra-202401229395,
  author    ={Goetjes, Victoria and Zarges, Jan-Christoph and Heim, Hans-Peter},
  title    ={Resistance of poly(lactic acid)/starch composites to weathering effects},
  keywords ={620 and Permeabilität and Biopolymere and Hydrolyse and Stärke},
  copyright  ={http://creativecommons.org/licenses/by/4.0/},
  language ={en},
  journal  ={Journal of Applied Polymer Science},
  year   ={2023-10-06}
}