Solid-state hydrolysis of postconsumer polyethylene terephthalate after plasma treatment

Autor(es)

Mancini, Sandro Donnini ^[1] ; Nogueira, Alex Rodrigues ^[2] ; Rangel, Elidiane Cipriano ^[2] ; da Cruz, Nilson Cristino ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Dept Environm Engn, Sao Paulo - Brazil

^[2] Univ Estadual Paulista, Dept Control & Automat Engn, UNESP, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Polymer Science; v. 127, n. 3, p. 1989-1996, FEB 5 2012.
• Citações Web of Science: 10

Resumo

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 (25130 W), pressure (50200 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 degrees. Samples of PET before and after the optimized plasma condition were subjected to hydrolysis at 205 degrees 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. (c) 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 127: 1989-1996, 2013 (AU)

• Processo FAPESP: 04/08718-9 - Desenvolvimento de processos alternativos de reciclagem de poli (tereftalato de etileno) proveniente de resíduos sólidos urbanos
• Beneficiário: Sandro Donnini Mancini
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 06/55213-5 - Otimização e reciclagem química da PET por hidrólise neutra após o aumento da hidrofilicidade do polímero por tratamento a plasma
• Beneficiário: Alex Rodrigues Nogueira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica