The Calorimetric and Mechanical Properties of Virgin and Recycled Poly( Ethylene Terephthalate) From Beverage Bottles

摘要: In the present work, fusion behavior, crystallinity, and mechanical properties of beverage bottle poly(ethy1ene terephthalate) (PET) was compared with those virgin material. Viscosimetry measurements, differential scanning calorimetric studies, impact tensile determinations were made in both materials. The lower R, PET revealed that a thermomechanical degradation occurred during processing. Although bottles possess considerable degree crystallinity (=30 percent), crystallites are so small they don’t scatter light and, therefore, transparent. Virgin exhibited brittle behavior while ductile one. This is consequence difference between materials (greater for because its original higher content), although molded under same conditions. Such attributable to “crystalline memory” effect having origin orientation material injection molding at low temperature (25OOC). Injection-molded specimens showed strong crystalline memory. capable crystallization very fast quenchings.