Polymerization and polymer modification in supercritical fluids - a novel way for cleaner manufacturing of plastics

Informations projet

SUPERPOL

N° de convention de subvention: BRPR970503

Projet clôturé

Date de début 1 Decembre 1997

Date de fin 30 Novembre 2000

Financé au titre de

• Specific research and technological development programme in the field of industrial and materials technologies, 1994-1998

Coût total

Aucune donnée

Contribution de l’UE

Aucune donnée

Coordonné par

Aristotle University of Thessaloniki
Greece

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Livrables

Process for the gamma rays initiated dispersion polymerization of vinyl monomers in CO2-based dense systems under mild conditions

Gamma-rays are effective in the dispersion polymerization of vinyl monomers such as methyl methacrylate (MMA) and 1,1 difluoroethylene (VF2) in CO(2)-based dense systems: the most relevant advantages by the use of this initiation method lie both in the possibility to have a very pure starting system and to operate at very mild temperature and pressure conditions. Moreover, y-rays sustain the polymerization up to high conversion in short reaction times. The obtained polymer has a very high average molecular weight with a narrow distribution and a high degree of molecular complexity (branching and/or cross-linking) depending on the nature of the surfactant and on the adopted radiation intensity ; with a proper selection of the operative conditions the polymer properties (molecular weight and rheological behavior) are comparable to those obtained in conventional polymerizations carried out in the presence of AIBN at higher temperatures.

Résultats exploitables

Modification of polymers using supercritical carbon dioxide as a swelling and solvent agent

Grafting of maleic anhydride onto polyolefins (iPP and EPR) in the presence of organic peroxide as a free radical source was performed using scCO2 as a swelling agent to deliver inside the matrix the initiator and the carbonyl compound. Grafting level comparables to that obtained with conventional processes was reached without significant degradation of the polymers. The efficacy of modified iPP as a compatibilizer in the preparation of polypropylene polyamide blends was verified.