Distinguishing between virgin and post-consumption bottle-grade poly (ethylene terephthalate) using thermal properties

Autor(es)

Romao, Wanderson ^[1] ; Franco, Marcos F. ^[1] ; Bueno, Maria Izabel M. S. ^[2] ; De Paoli, Marco-Aurelio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Lab Polimeros & Reciclagem, Inst Quim, BR-13083970 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Grp Espectroscopia Raios X, Inst Quim, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Polymer Testing; v. 29, n. 7, p. 879-885, OCT 2010.
• Citações Web of Science: 8

Resumo

Recycled bottle-grade poly(ethylene terephthalate), PET, can be mixed with virgin resin in different concentrations to be used by the food packaging industry. This will contribute to the growth of mechanical recycling of PET, but it is important to have an experimental method to detect the presence of recycled polymer in a batch. Differential scanning calorimetry was used to study the influences of the presence of post-consumption bottle-grade PET and of thermo-mechanical processing on the thermal properties of bottle-grade PET. When the virgin resin is subjected to thermo-mechanical processing (pre-forms, soft-drink bottles production, recycling or PET mixtures preparation), the crystallization rate is affected and a clearly defined crystallization peak, T(c), is observed. A bimodal melting temperature, T(m), behavior is observed for samples that were subjected to processing. When post-consumption PET is present in the mixtures, the T(m) bimodal behavior is followed by a narrowing and a shift of the T(c) to higher temperatures. Therefore, the crystallization rate, T(m) and T(c) are the principal thermal properties that can be used to distinguish between virgin and post-consumption resins submitted to thermo-mechanical processing. (AU)

• Processo FAPESP: 04/15084-6 - Materiais poliméricos de baixo impacto ambiental
• Beneficiário: Marco-Aurelio de Paoli
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 07/54023-0 - Desenvolvimento de metodologia para detectar a presença de pet-pós consumo em embalagens PET para alimentos
• Beneficiário: Wanderson Romão
• Modalidade de apoio: Bolsas no Brasil - Mestrado