Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/article/doi/10.1590/0104-1428.10619
Polímeros: Ciência e Tecnologia
Original Article

Mechanical and water absorption properties and morphology of melt processed Zein/PVAl blends

Sandro Junior Vessoni Torres; Gabriela Brunosi Medeiros; Francisco Rosário; Fabio Yamashita; Luiz Henrique Capparelli Mattoso; Elisângela Corradini

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Abstract

Blends of zein and poly(vinyl alcohol) (PVAl) were processed in an internal mixer (150ºC, 50 rpm) for 5-8 minutes. Glycerol and oleic acid were used as plasticizers. The mixtures obtained were then compression molded and further characterized by Fourier transform infrared spectroscopy (FTIR), water-absorption experiments, mechanical tests, and scanning electron microscopy (SEM). FTIR analysis indicated the existence of hydrogen bonding interactions between zein and PVAl. Tensile tests showed that the addition of PVAl increased the flexibility of the blends. The tensile strength ranged from 1.7 to 5.7 MPa, elongation at break ranged from 2.7 to 32% and Young’s modulus ranged from 433 to 7371 MPa. Water absorption at equilibrium decreased with increasing zein content, which favored a brittle behavior in the zein/PVAl. The blends were immiscible in the composition studied and the presence of voids indicated poor interfacial interaction between the polymers.

 

Keywords

melt processing, oleic acid, glycerol, poly(vinyl alcohol) and zein

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