Dear Mansour Hachemi, bioressources based polymers have many outstanding properties inattainable by synthetic polymers, mainly the biodegradability and biocompatibility. In terms of properties they are progressively improved via many processes such as blending and crosslinking (low degrees), to be competitive with traditional synthetic polymers. May be the economic aspect is the last obstacle for their widespread production and uses. My Regards

Hi;

Biobased plastics do have a better environmental performance than petrochemical plastics, but only in some aspects. In fact, they have a better performance in terms of non-renewable energy consumption and greenhouse gas emissions, but these benefits are diminished by the production of the raw materials needed to make them.

The properties of bio-based plastics depend on the chemical structure of the polymer. In the case of PLA, for example, its thermal stability and impact resistance are lower than those of conventional polymers used in thermoplastic applications. Thus, in order to improve its properties and diversify its applications, formulations are used: (1) PLA modified with additives, (2) blends and (3) composite materials. The first formula consists of adding fillers to improve its resistance to heat, or to reduce the cost of production. The second formula consists of mixing different polymers, for example PLLA with PDLA. Thus, PLLA, with a higher crystallinity than PDLA, gives the material a higher softening temperature, but also a higher brittleness, while PDLA gives the opposite properties. The third formula consists in adding other polymers, in order to mitigate the brittleness of the material.

My regards

Dear Doufnoune RACHIDA Rachida and Abdelkader BOUAZIZ .

Thank you for your answer.

My regards.