Thermal degradation of polymers during their mechanical recycling
TypeChapitres d'ouvrages scientifiques
This chapter deals with thermal degradation processes occurring during polymer recycling by melt re-processing, i.e. mechanical recycling. Some general aspects of polymer processing are first recalled. Then, thermal degradation mechanisms and kinetics are described, and the main processing methods are compared from this point of view. Temperature-molar mass maps allow to define a processability window and to envisage industrial ways (in particular, the use of processing aids and thermal stabilizers) to widen this window. The end of this chapter is devoted to a case study: PET mechanical recycling by extrusion molding, which is characterized by an especially complex combination of degradation processes.
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SARRABI, Salah; COLIN, Xavier; TCHARKHTCHI, Abbas (Wiley Periodicals, Inc., 2010)The main drawback of rotational molding is a long stay (several dozens of minutes) of polymer in melt state at high temperature in atmospheric air. To prevent any significant polymer thermal degradation, it is necessary ...
ESMAEILLOU, Bardia; FEREIRRA, P; BELLENGER, Véronique; TCHARKHTCHI, Abbas (Wiley, 2012)Fatigue damage initiation of a PA66/glass fiber composite material is studied with interrupted tests carried out with an “alternative bending device” and a small applied strain. During the damage initiation period, no ...
DU, Weiwei; DOUADJI, Lyes; DELMOTTE, Michel; MAZABRAUD, Philippe; TCHARKHTCHI, Abbas (Société Française de Thermique / Congrès Français de Thermique, 29 mai - 1 juin 2007, Île des Embiez, 2007)Dans le procédé du rotomoulage, le phénomène physique majeur lors de l’écoulement des poudres est la coalescence et densification des grains. La coalescence est la formation d’une seule particule elliptique à partir de ...
ABDALLAH-ELHIRTSI, Sofiane; FITOUSSI, Joseph; RASHMI, Baralu-Jagannatha; PRASHANTHA, Kalappa; FARZANEH, Sedigheh; LACRAMPE, Marie-France; KRAWCZAK, Patricia; TCHARKHTCHI, Abbas (Wiley Online Library, 2015)In this work, an experimental investigation on a partial shape memory polymer (PSMP) which is transformed into shape memory material is presented. Multicycle shape memory tests are performed on thermoplastic polyurethane ...
TCHARKHTCHI, Abbas; ABDALLAH-ELHIRTSI, Sofiane; EBRAHIMI, Kambiz; FITOUSSI, Joseph; SHIRINBAYAN, Mohammadali; FARZANEH, Sedigheh (MDPI, 2014)In this study some new concepts regarding certain aspects related to shape memory polymers are presented. A blend of polylactic acid (PLA) (80%) and polybutylene succinate (PBS) (20%) was prepared first by extrusion, then ...