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Effect of drying temperature on structural and thermomechanical properties of konjac glucomannan-zein blend films.

Abstract：

:Konjac glucomannan (KGM)/zein blend films were successfully prepared by solution casting at different drying temperatures (40, 50, 60, 70 and 80°C). The effects of drying temperature on the films' structural, thermomechanical, mechanical and water barrier properties were investigated. Microstructural observations indicated that zein particles were homogeneously dispersed in KGM continuous matrix, and the blend film dried at 60°C showed the most compact and smooth surface. Dynamic mechanical thermal analysis curves showed that with increasing drying temperature from 40 to 60°C, glass transition temperature (Tg) of films increased; however, with further increase in temperature, the Tg decreased, indicating the compatibility of film components was the highest when dried at 60°C. The hydrophobicity of blend film dried at 60°C was significantly stronger than that of other blend films, supported by the highest water contact angle, and the lowest swelling ratio and solubility. Moreover, the film dried at 60°C showed the highest tensile strength, elongation at break, and the lowest water vapor permeability. Therefore 60°C was preferred for KGM/zein blend film preparation. This study indicated that intermolecular interactions among film components were greatly influenced by the drying temperature, and should be carefully noticed for film preparation.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Li C,Wu K,Su Y,Riffat SB,Ni X,Jiang F

doi

10.1016/j.ijbiomac.2019.07.007

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

135-143

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(19)31040-2

journal_volume

138

pub_type

杂志文章

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