Rheological behavior of PET scraps modified by reactive extrusion

Autori: P. Scarfato, L. Incarnato, D. Acierno
Presentato al: Southern Europe Conference on Rheology
Anno: 1999
Volume: 2
Issue: Unico
Casa Editrice: SIR-Cuen Napoli
Lingua: English


Abstract
The reactive extrusion process can be employed to increase the molecular weight of reusing industrial scraps coming from PET processing plants. In many cases these scraps are uncontaminated but their viscosity is lowered by the first extrusion. In this instance the use of some so called chain extenders has been pointed out in specific works as a good method of enhancing material viscosity (1-4). In fact, the chain extenders can react with the PET end groups (carboxyl and hydroxyl groups) increasing the molecular weight of the polymer. Some working parameters are critical in the control of the polyaddition reaction: concentration of the chain extender, residence time of the polymer in the extruder, working temperatures. Moreover from the addition reaction, depending from the structure of the chain extender used, new hydroxylic groups can be formed which can lead to branching or even crosslinking. As a consequence, the properties of the resulting extended polymer are influenced both in the melt and in the solid state.


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