Authors: Mario Guimarães Vagner Roberto Botaro Kátia Monteiro Novack Fábio Gomes Teixeira Gustavo Henrique Denzin Tonoli
Publish Date: 2015/09/14
Volume: 22, Issue: 10, Pages: 192-
Abstract
This study aimed to evaluate the thermal mechanical physical structural and morphological properties of new polymeric mixtures based on cassava starch CMS and polyvinyl alcohol PVA in the proportions of 0/100 20/80 40/60 50/50 60/40 80/20 and 100/0 using the casting method The polymer concentrations and choice of plasticizer were defined after preliminary tests Mechanical tests revealed that blends became more flexible and ductile with increasing the PVA proportion The spectroscopy analysis showed significant alterations on the positions and intensity of the bands in 2920 1415 1150 1077 927 and 848 cm−1 thus indicating a good compatibility among the polymers Increase of the CMS proportion was reduced until reaching 45 of the values of water vapor permeability WVP in relation to PVA biofilm Any of the combinations was enough to make the blend less permeable than the CMS biofilm After increasing the CMS proportions all blends were more soluble in water compared to PVA biofilm The exception was the 20P80A blend Besides representing a tendency of higher opacity all blends with elevated CMS proportions were more thermally stable when compared to those with the same proportions of PVA Results showed the potential of such blends for applications on sectors of plastic and agricultural packagesThe authors thank the Fundação de Amparo à Pesquisa do Estado de Minas Gerais FAPEMIG Thanks are also given to the Centro Federal de Educação Tecnológica de Minas Gerais CEFETMG Rede Temática de Engenharia de Materiais REDEMAT and the Rede Brasileira de Compósitos e Nanocompósitos Lignocelulósicos RELIGAR in Brazil Thanks also to the Instituto de Tecnologia de Alimentos/Centro de Tecnologia de Embalagem ITAL/CETEA LME UFLA DCF UFLA and DCA UFLA
Keywords: