Solid-state hydrolysis of postconsumer polyethylene terephthalate after plasma treatment
Data de publicação2013-02-05
Direito de acesso
MetadadosExibir registro completo
Plasma treatments were applied on the surface of postconsumer polyethylene terephthalate (PET) bottles to increase their wettability and hasten the subsequent hydrolysis process. Sixty-four treatments were tested by varying plasma composition (oxygen and air), power (25-130 W), pressure (50-200 mTorr), and time (1 and 5 min). The best treatment was the one applied in air plasma at 130 W and 50 mTorr for 5 min, as it provided the lowest contact angle, 9.4°. Samples of PET before and after the optimized plasma condition were subjected to hydrolysis at 205°C. Although the treatment changed only a thin surface layer, its influence was evident up to relatively high conversion rates, as the treated samples presented more than 40% higher conversion rates than the untreated ones after 2 h of reaction. Infrared spectroscopy showed that the terephthalic acid obtained from 99% of depolymerization was similar to the commercial product used in PET synthesis. © 2012 Wiley Periodicals, Inc.
Como citar este documento
Este item aparece nas seguintes coleções
Exibindo os itens relacionados pelo título, autor e palavra-chave.
Plasma levels of transthyretin and retinol-binding protein in child-a cirrhotic patients in relation to protein-calorie status and plasma amino acids, zinc, vitamin a and plasma thyroid hormones Calamita, Zamir; Dichi, Isaías; Papini-Berto, Sílvia J.; Dichi, Jane B.; Angeleli, Aparecida Y.O.; Vannucchi, Hélio; Caramori, Carlos Antonio ; Burini, Roberto Carlos (Arquivos de Gastroenterologia, 1997) [Artigo]Transthyretin and retinal-binding protein are sensitive markers of acute protein-calorie malnutrition both for early diagnosis and dietary evaluation. A preliminary study showed that retinal-binding protein is the most ...
Guasti, Priscilla Nascimento ; Souza, Fabiana Ferreira de ; Scott, Carolina ; Hartwig, Felipe Pires ; Papa, Patrícia de Melo ; Santos, Gabriel Arcencio de Marchi dos ; Freitas-Dell'aqua, Camila de Paula ; Papa, Frederico Ozanam (Journal of Equine Veterinary Science, 2014) [Artigo]
Vitamin E levels in maternal plasma and cord blood of very low birth weight infants and its relationship with plasma lipids Wey, M.; Rugolo, A.; Bossolan, G.; Bentlin, Maria Regina ; Padovani, Carlos Roberto ; Trindade, CEP (Pediatric Research, 2004) [Resumo]