Pressure-assisted thermal sterilization effects on gas barrier, morphological, and free volume properties of multilayer EVOH films

被引：29

作者：

Dhawan, Sumeet ^{[1
]}

Varney, Christopher ^{[2
]}

Barbosa-Canovas, Gustavo V. ^{[1
]}

Tang, Juming ^{[1
]}

Selim, Farida ^{[2
]}

Sablani, Shyam S. ^{[1
]}

机构：

[1] Washington State Univ, Dept Biol Syst Engn, Pullman, WA 99164 USA

[2] Washington State Univ, Dept Phys & Astron, Pullman, WA 99164 USA

来源：

JOURNAL OF FOOD ENGINEERING | 2014年 / 128卷

基金：

美国国家科学基金会;

关键词：

High pressure processing; Gas transmission; Free volume; X-ray diffraction; Positron; X-RAY-DIFFRACTION; CRYSTALLINITY; PERMEABILITY; TEMPERATURE; BLENDS;

D O I：

10.1016/j.jfoodeng.2013.12.012

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Pressure-assisted thermal sterilization (PATS) alters the morphology and free volume distributions of polymers leading to a decrease in gas-barrier properties of polymer packaging materials, and hence compromising the quality and shelf life of PATS processed foods. Two multilayer ethylene-vinyl alcohol (EVOH) films, intended for high pressure applications, were investigated to understand the influence of, free volume characteristics and film morphology on gas-barrier properties of PATS processed EVOH films. X-ray diffraction (XRD) and positron annihilation lifetime spectroscopy (PALS) were applied to investigate film morphology and free volume characteristics, respectively. Film A was comprised of polyethylene terephthalate (PET)/EVOH/polypropylene (PP). Film B consisted of PET laminated to a co-extruded structure of PP/tie/Nylon6/EVOH/Nylon6/tie/PP. Both oxygen and water vapor transmission rates increased in the two films after the selected treatments. However, the increase in film A is much larger which can be understood from the change in free volume distributions measured by positron lifetime and overall crystallinity observed from X-ray diffraction. This work shows that PALS and XRD are suitable tools to reason out the gas-barrier changes in multilayer EVOH films after PATS treatment. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：40 / 45

页数：6

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