Enzymatic surface hydrolysis of PET enhances bonding in PVC coating

• Autor(a) principal: Almansa, E.
• Data de Publicação: 2008
• Outros Autores: Heumann, S., Eberl, A., Fischer-Colbrie, Gudrun, Martinkova, L., Marek, J., Paulo, Artur Cavaco, Guebitz, G. M.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/16432
• topic: Beauveria brongniartii; Polyesterase; PVC; PET; Science & Technology

The effect of polyesterase preparations from Thermomyces lanuginosus and Beauveria brongniartii on the hydrophilicity of PET materials was assessed. As a result of polyesterase treatment the hydrophilicity of PET fabrics was increased by up to 8 cm in terms of rising height with increases in surface tension from 6.2 mNm (heat-inactivated control samples) to above 8 mNm. Both enzymes were able to increase the amount of hydroxyl groups on PET from 90 to a maximum of 182 mmol kg-1, while only the B. brongniartii polyesterase released significant amounts of terephthalic acid from PET. Enzymatic surface hydrolysis of PET increased the bonding strength in PVC coating to 13.40 daN 5cm-1 using 0.5% adhesive compared to 11.5 daN 5cm-1 obtained without enzyme pretreatment and 6% of adhesive.