Influence of fibre architecture on the biodegradability of FLAX/PLA composites

Polymers derived from renewable resources are known for their low impact on the carbon footprint as they are recyclable by decaying processes. When these materials are blended with natural fibres to form composites, they are also highly suitable for technical applications but maintain their outstanding recycling potential. However, as natural fibres increase the strength and alter the polymers' structure, they can also affect the decaying processes. The objective of this study is to investigate the influence of flax fibre reinforcements on the decaying process of poly(lactic) acid (PLA) in flax - PLA composites under composting conditions. The results indicate that the fibres enhance the biodegradation by enlarging the potential surface contributing to the decaying process. At the same time, the fibres act as channels and distribute water and microorganisms in the composite. The decaying process is attributed to fibre decomposition and hydrolysis of PLA which leads to increased degradation rates for composites with high fibre weight content.