Radiation treatment for sterilization of packaging materials

Haji‐Saeid, M.; Sampa, M.H.O.; Chmielewski, A.G.

doi:10.1016/j.radphyschem.2007.02.068

Cited by 90 publications

(38 citation statements)

References 25 publications

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“…These intermediates can follow several reaction paths that result in rearrangements and/or the formation of new bonds. 22 In this work occurred the increase of carbonyl and vinyl index. …”

Section: Fourier Transformed Infrared Spectroscopy (Ftir)mentioning

confidence: 81%

Effect of the radiolitic sterilization in polyethylene/starch blends

Ferreira¹,

Lima²,

Almeida³

et al. 2008

Quím. Nova

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Recebido em 20/3/07; aceito em 11/10/07; publicado na web em 2/4/08Samples of LDPE/modified starch blends 80/20 m/m before and after exposure to gamma rays were examined by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction. The effect of gamma radiation is clearly seen in the samples irradiated at a dose of 25 kGy. The main alteration in the polymeric material after exposure at the radiation range was a decrease in the mechanical properties, alterations in the chemical structure of the blend with an increase in the carbonyl and vinyl indices and the appearance of new crystalline symmetry generating a crystalline domain not existing before in the blend.

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“…These intermediates can follow several reaction paths that result in rearrangements and/or the formation of new bonds. 22 In this work occurred the increase of carbonyl and vinyl index. …”

Section: Fourier Transformed Infrared Spectroscopy (Ftir)mentioning

confidence: 81%

Effect of the radiolitic sterilization in polyethylene/starch blends

Ferreira¹,

Lima²,

Almeida³

et al. 2008

Quím. Nova

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“…ENCs can undergo plasma, gamma or electron beam treatment in order to be sterilized, but most of the time a surface modification is desired [11,20,96,97,100,[114][115][116][117][118][119][120].…”

Section: Ageing By Ionizing Radiationmentioning

confidence: 99%

Physico-chemical ageing of ethylene–norbornene copolymers: a review

et al. 2017

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The main object of this report is to review and summarize the current state of the scientific literature relating to physico-chemical ageing of ethylene-norbornene copolymers (ENCs). These processes occur through different means such as photodegradation under the effect of ultraviolet radiation, temperature and ionizing radiation (under air or oxygen). In most cases ageing causes chains scissions that lead to the creation of degradation compounds that exhibit high mobility, corresponding to their low molecular weight and/or high polarity. Cross-linking can also occur, leading to the modification of mechanical properties. The presence of oxygen during ageing is of great importance for the physico-chemical modifications of those polymers in terms of oxidation and thermal stability. ENCs belong to cyclic olefin copolymers (COC) class, whose synthesis was developed in the late 1950s. Nevertheless, commercial applications are relatively new. They attract growing interest in different fields, due to their very useful physical and chemical properties such as transparency, heat and chemical resistance, low permeability to gas as well as biocompatibility. In the literature, a large number of papers deal with the synthesis and characterization of different grades of ENC, but only a few deal with the effects of ageing on these materials. This literature review consists of a summary of the main milestones in the development of COC as well as of cyclic olefin polymers (COP), a review of main techniques for predicting ageing, degradation of additives and interaction between COC/COP and contact environment as well as toxicity of the extractables.

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“…This is because a sterile packaging material is obtained [29]. Simultaneously, the development of the methods of radiation decontamination of various commercial products involves requirements for appropriate resistance against irradiation of the materials applied for such products packing [32,33].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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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.

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Radiation treatment for sterilization of packaging materials

Cited by 90 publications

References 25 publications

Effect of the radiolitic sterilization in polyethylene/starch blends

Effect of the radiolitic sterilization in polyethylene/starch blends

Physico-chemical ageing of ethylene–norbornene copolymers: a review

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

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