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Phase transitions in biodegradable films based on blends of gelatin and poly (vinyl alcohol) 116
Sobral,Paulo José do Amaral; Carvalho,Rosemary Aparecida de; Moraes,Izabel Cristina Freitas; Bittante,Ana Mônica Quinta Barbosa; Monterrey-Quintero,Ednelí Soraya.
The aim of this work was to study the effect of the hydrolysis degree (HD) and the concentration (C PVA) of two types of poly (vinyl alcohol) (PVA) and the effect of the type and the concentration of plasticizers on the phase properties of biodegradable films based on blends of gelatin and PVA, using a response-surface methodology. The films were made by casting and the studied properties were their glass (Tg) and melting (Tm) transition temperatures, which were determined by diferential scanning calorimetry (DSC). For the data obtained on the first scan, the fitting of the linear model was statistically significant and predictive only for the second melting temperature. In this case, the most important effect on the second Tm of the first scan was due to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Protein; Glass transition; Melting; Surface-response.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612011000200015
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