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S. Daren



Homomicronization – a Route for Polymer Recycling. The Newplast Process (in English)


Polimery 1998, No 6, 379


DOI: dx.doi.org/10.14314/polimery.1998.379


Summary

Recycling technologies require either the plastic waste to be sorted into polymer families or compatibilized by the use of expensive Block copolymers. The novel process, Newplast, puts mechanochemical reactions to good use, to break mixed-waste polymer backbones at thermodynamically weak points (S—S, О—О bonds), crosslinks, and entanglement points. The homomicronizer is a steel chamber containing a high-speed mechanical rotor with blades; the residence time of the plastic in the homomicronizer is about 1 min. An antioxidant and a plasticizer are added. The resulting alloy is extruded, filtered, degassed, cooled and pelletized. The recycled plastics taken from municipal waste (Montreal, Canada), -85% PE, were compared in mechanical properties with dry-blended and virgin polymers and with an SSSE (solid-state-shear-extrusion) material (Table 2). They showed a good balance of properties. The elongation at break was 1.33 as high as that of HDPE.


Keywords: homomicronization of waste plastics, mechanochemical reactions, Newplast recycling process, mechanical properties of recyclates


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