Effects of X-ray, electron beam and gamma irradiation on PE/EVOH/PE multilayer film properties

Abstract

To increase sterilization capacity, X-ray and e-beam irradiation modalities are more and more attractive for the indutrial sterilization of heathcare products (medical devices and biopharmaceutical goods). However, no studies comparing...

Effects of X-Rays, Electron Beam, and Gamma Irradiation on Chemical and Physical Properties of EVA Multilayer Films

“…These observations could mean that the process and the quantity of oxidizing species generated are the same with gamma rays and X-rays. The quantity of oxidizing species generated with e-beam and interacting with the polymer matrix could be altogether lower ( Girard-Perier et al, 2021 ). It is widely described in literature that the interaction of high energy photons, such as gamma and X-ray, with matter leads to ionization through electron pair formation, the Compton effect (predominant), and photo elastic electron formation ( Adliéné and Adlytė, 2017 ; Adliéné et al, 2017 ).…”

The Structure and Properties of Medical Disposable Protective Clothing Materials with Different Packaging and Models under γ Irradiation

“…[4] In order to improve the sterilization capacity, the use of γ-rays to irradiate medical supplies is getting more and more attention. [5] During the sterilization process of medical disposable protective clothing by γ irradiation, the changes in molecular structure caused by the irradiation can result in free radical-induced after-effects, [6][7][8] which lead to material property deterioration and cannot meet the usage requirements. [9] The main material of medical disposable protective clothing is polypropylene, [10] its radiation mainly involves β degradation.…”

“…To deal with this situation, γ irradiation can be used to solve the sterilization problem of medical disposable protective clothing, which has technical advantages such as high production capacity and no need for resolution [4] . In order to improve the sterilization capacity, the use of γ‐rays to irradiate medical supplies is getting more and more attention [5] . During the sterilization process of medical disposable protective clothing by γ irradiation, the changes in molecular structure caused by the irradiation can result in free radical‐induced after‐effects, [6–8] which lead to material property deterioration and cannot meet the usage requirements [9] .…”

Copolymers of Vinyl Acetate and Vinyl Carboxylates Bearing Branched C7–C9 Chains: Synthesis, Alcoholysis, and Properties

“…In addition, the PVA/formaldehyde adduct is an engineering plastic, and the PVA with acetaldehyde and butyraldehyde adducts are excellent binders of glass and ceramic green tapes. , The packing composite film with PVA as an internal layer demonstrates excellent moisture barrier performance and has been widely used in the pharmaceutical and food industries. − However, due to strong intermolecular hydrogen bonds, the production of PVA film is difficult. Another important commercial copolymer containing vinyl alcohol units is ethylene-vinyl alcohol copolymer (EVOH). − EVOH is a semicrystalline polymer widely used in food, cosmetics, and pharmaceutical packaging for its excellent oxygen barrier property, easy processability, nontoxicity, flexibility, and thermal stability. − In recent years, there has been a resurgence of interest in EVOH because of its emerging applications such as protein separation, drug release, and battery separation. − The production of EVOH consists of two steps, including the synthesis of the vinyl acetate-ethylene copolymer (EVA) by radical copolymerization and the subsequent alcoholysis in toluene at high temperature . Alcoholysis degree is a crucial parameter that affects the properties of EVOH .…”