The influence of ionizing radiation on the properties of starch-PVA films

Abstract

Abstract. The cornstarch: poly(vinyl alcohol) (PVA) fi lms characterized by the alternating ratio of starch: PVA (100:0, 80:20, 60:40, 40:60, 20:80, and 0:100) and containing 30% of glycerol were prepared by solution casting. The fi lms were irradiated with an absorbed dose of 25 kGy with gamma rays in a vacuum and with fast electrons in the air. The fi lms characterized by a high content of starch appeared stiff, while the fi lms characterized by a high content of PVA were highly fl exible. The tensile strength and fl exibility, as well as swelling and hydrophilicity, increased with the increase in the PVA content in the fi lms. However, the tensile strength and wetting angle values achieved a minimum at an intermediate composition. It was found that irradiation enables to reduce hydrophilicity of the fi lms accompanied by a decrease in their fl exibility. No general conclusion concerning the effect of irradiation on tensile strength and swelling behavior can be derived. An increase in the homogeneity of the fi lms and an increase in the compatibility of their components was found by scanning electron microscopy (SEM). Strong interactions of the starch and the PVA components were discovered by diffuse refl ectance spectroscopy. Degradation was found to be the prevailing process occurring in the fi lms under the infl uence of irradiation. The possible accompanying crosslinking is discussed in terms of the gel content in the samples. Creation of various oxidation products in the fi lms characterized by the modifi ed composition was observed under the infl uence of irradiation carried out in the air. Basing on the obtained results it can be supposed that the selected starch-PVA compositions might appear useful as packagings of the products predicted for radiation decontamination.

Effect of Radiation Treatment on Starch Bioplastic- A Review

“…Last for gamma irradiation, on the result of (Antonio et al, 2018), under 25kGy will not compromise the starch-based properties. Nevertheless, in the opinion of (Abramowska et al, 2015), at 25kGy dose, the flexibility of Nasir & Othman Int J Adv Life Sci Res. Volume 1(4)1-7 starch-based were decreasing but the mechanical properties are still acceptable.…”

“…Second for electron beam irradiation, according to (Abramowska et al, 2015) when the corn-based were exposed to the electron beam irradiation, the mechanical properties were decreasing however it still acceptable. In spite of that, (Abd El-Mohdy, 2006) state that electron beam irradiation led to decreasing the tensile strength of starch-based which is due to radiation induce cross-linking reaction.…”

“…of mechanical properties but still acceptable. (Abramowska et al, 2015) Improve tensile strength and elongation at break (Abd El-Mohdy, 2006) 15kGy enhance starch-based properties (Sharifah et al, 2000) Decreasing of tensile strength as the doses increase and change to yellow color. (Vanessa & Nelida, 2017) Gamma Irradiation Under 25kGy will not compromise the structure of starch-based properties.…”

“…This occurrence is due to decreasing of hydrophilic group (OH) when cross-linking occurs. Second, for electron beam irradiation there was an improvement of hydrophobic properties of starch-based (Abramowska et al, 2015). According to (Abd El-Mohdy, 2006) and (Natalia et al 2009), electron beam irradiation improves the water resistance at the high doses and it has been considered as a convenient tool for the modification of starchbased properties and may enlarge the starchbased application.…”

“…Last for gamma irradiation, when the gamma was applied on the starchbased, their barrier properties improve and there were increasing in terms of compatibility and homogeneity between the compounds (Natalia et al 2009). Gamma irradiation led to degradation and cross-linking which is resulting in decreasing of hydrophilicity starchbased (Abramowska et al, 2015). (Nawapat & Thawien, 2011) Improve the water vapor permeability (Nawapat & Thawien, 2013) Electron Beam Irradiation Improvement of the water resistance (Abd El-Mohdy, 2006) Decreasing the hydrophilicity (Abramowska et al, 2015) Decreasing the water absorption (Natalia et al 2009).…”