Effect of glucose fouling on the dissolved gases permeation through maximum‐crystallized poly(lactic acid) films

Abstract

In this study, we investigated the effect of fouling on the dissolved oxygen and carbon dioxide permeation in water through maximum-crystallized poly(lactic acid) (PLA) films by using proton nuclear magnetic resonance, attenuated total reflection-Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, and ultraviolet-visible spectroscopy, contact angle, water content ratio, and dissolved gas permeation. Fouling means the adhesion of contents on a container's internal surface, where content adhesion can directly influence the barrier property of the container. Glucose, a beverage ingredient, was used as a foulant. The permeation of dissolved gases in amorphous PLA film, maximum-crystallized PLA film, and fouled maximum-crystallized PLA film was determined. The decreased interstices in the polymer chains during crystallization resulted in the inhibition of the diffusion and decrease in the permeability coefficient of the gases. Moreover, the slope of the permeability coefficient for carbon dioxide in the Arrhenius plot was found smaller than that of oxygen's. This result indicated that the gas barrier property of dissolved carbon dioxide was considerably influenced by solubility and readily decreases during glucose fouling. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46604.

Understanding the oxygen barrier property of highly transparent poly(lactic acid)/benzoxazine composite film by analyzing the UV‐shielding performance

“…As shown in Figure for the ATR‐FTIR spectra, the pristine BOZ shows absorption peaks at approximately 1600, 1496, and 947 cm −1 , which are assigned to the characteristic stretching vibration of C=C for benzene ring, stretching vibration of trisubstituted benzene ring and out‐of‐plane bending vibration of C‐H, respectively . The pristine PLA presents absorption peak at 1751 cm −1 , which belongs to the characteristic stretching vibration of C=O . With increasing the BOZ content, the integrated characteristic absorption intensities of BOZ increase gradually.…”

“…26 The pristine PLA presents absorption peak at 1751 cm −1 , which belongs to the characteristic stretching vibration of C=O. 28,29 With increasing the BOZ content, the integrated characteristic absorption intensities of BOZ increase gradually. Moreover, the integrated characteristic absorption intensity of PLA decreases gradually, which is mostly due to the diluting effect of added BOZ.…”

Effects of Nanofiller-Induced Crystallization on Gas Barrier Properties in Poly(lactic acid)/Montmorillonite Composite Films

“…7,8 The permeation properties of oxygen through the PLA/ MMT composite films in the water phase were determined by the isobaric pressure method using an electrode sensor (Tsukubarikaseiki, Co., Ibaraki, Japan) at 25 ± 1, 30 ± 1, 35 ± 1, and 40 ± 1 °C, according to the experimental method described in the literature. 9 The supply side was filled with ultrapure water and saturated with oxygen gas, and then, the permeation side was filled with 0.5 N KCl solution. The electrode sensor detected a steady current, indicating the concentration of oxygen on the permeation side.…”