14 mar
14/03/2019 10:00

Sciences & Société

Soutenance de thèse : Alessia QUITADAMO

Soutenance en cotutelle internationale entre la Sapienza - University of Rome et l’INSA Lyon

Influence of wood flour and cellulose on the properties and the stability of formulations based on polyolefins and bio-based polymers 

Doctorant : Alessia QUITADAMO

Laboratoire INSA : IMP
Ecole doctorale : ED34 Matériaux de Lyon

The objective of this research is the development of high-added value materials, with high amount of bio-derived fillers, resulting in a more eco-friendly product. The pursued strategy is based on both the introduction of natural fibres, and the use of oil-based and bio-derived polymers blends as matrices, reducing the amount of non-biodegradable amount in the material. The thesis project is based on the development of HDPE/PLA blends filled with natural fillers, such as wood flour and recycled paper fibres. High-density polyethylene has been chosen because it is one of the most representative recycled polymers on the market. Poly(lactic)acid has been selected as it is an important bio-degradable polymer on the market. The methodology developed here can be extended to other bio-degradable polymers, such as Soy Protein Isolate (SPI). Wood flour is a diffuse waste material, that can be used for production of Wood Plastic Composites.  Recycled paper fibres are derived from industrial paper waste, which cannot be subjected to traditional recycling processes.  Additives have been introduced in order to face the problem of different hydrophilicity between oil-base/bio- derived polymers and with natural fillers. The optimal composition and production processes are challenges, not only for the use of these materials, but also for their disposal. The end-of- life of these samples can be evaluated through controlled bio-degradability and compostability, correlating material structure with the ability to biodegrade. The production of a material at reduced environmental impact with properties consistent with their applications is a first environmental advantage. Obtaining a controlled biodegradability, as a function of the applications, would give enhanced value to our materials. Several characterizations have been performed in order to analyse the effect of different compatibilizers and treatments such as: tensile tests, scanning electron microscopy, differential scanning calorimetry, thermogravimetric analyses, infrared spectroscopy, size exclusion chromatography and composting tests.