Influence of γ-radiation on thermal destruction of a cross-linked acrylic polymer

Allayarov, S. R.; Confer, Matthew P.; Bogdanova, S. A.; Shaimukhametova, I. F.; Shigabieva, Y. A.; Dixon, David A.

doi:10.1016/j.polymdegradstab.2021.109697

Cited by 9 publications

(2 citation statements)

References 26 publications

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“…The development of the polymer network is assisted by the accomplishment of the recombination reactions, which may include the decay of the most abundant radicals. The lifetime of radiation processed materials is correlated with the development of crosslinking, which maintains the material integrity over the hard condition periods [ 19 ]. The competition between crosslinking and scission that characterizes the evolution of polymer energetic treatment forwards the material stability in relation with the new developed structure.…”

Section: Introductionmentioning

confidence: 99%

Radiation Processing of Styrene-isoprene-styrene/Poly(ε-caprolactone) Blends

Lungulescu¹,

Zaharescu²

2022

Polymers

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The irradiation consequences on styrene-isoprene-styrene (SIS)/poly(ε-caprolactone) (PCL) blends are discussed starting from the oxidation initiation. Three characterization methods: chemiluminescence, differential scanning calorimetry and FTIR spectroscopy are applied. The differences that exist between the two components are revealed, when the oxidation rates of the inspected formulas depend on the blending proportion and the degradation conditions. The relevant activation energies characterizing the oxidation strength as well as the kinetic parameters of degradation during the accelerated damaging of blended polymers are related to the inhibition protection of PCL on the faster oxidation of SIS. The interaction between mixed components is revealed by the structural modifications simultaneously accompanied by the competition of formation and decay of radicals.

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Section: Introductionmentioning

confidence: 99%

Radiation Processing of Styrene-isoprene-styrene/Poly(ε-caprolactone) Blends

Lungulescu¹,

Zaharescu²

2022

Polymers

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“…When polymers are exposed to different types of irradiation, such as gamma rays, the structure of the polymer is destroyed, and several changes can occur, including chain scission, bond breaking, unsaturated bond formation, intermolecular cross-linking, carbonrich cluster formation, free radical formation, and the ability of hydrogen molecules to release from the irradiated polymer chain. (Allayarov et al 2021;Guenther et al 2002;). Furthermore, the breakdown of chemical bonds and the generation of very energetic electrons as a result of the action of gamma-irradiation has a significant impact on the morphological, optical, and structural properties of polymeric materials and polymer composition (Soliman et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Improving photoluminescence, optical and electrical characteristics of PMMA films with gamma irradiation

Zaki¹,

Shubayr²,

Radwan³

et al. 2021

Phys. Scr.

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Polymeric materials are macromolecules, essentially a combination of numerous repeated subunits. Polymers are innovative and advanced materials that currently have a strong impact on our daily lives. In recent years, polymer use has been prominent due to the materials’ distinctive properties; thus, they entered different fields of science, technology and industrial-biomedical applications.The improvement of photoluminescence, optical and electrical characteristics of non-conducting Poly(methyl methacrylate) (PMMA) films was studied. Upon gamma irradiation of various doses, the photophysical and electrical properties of PMMA films were investigated using photoluminescence spectroscopy, ultraviolet–visible (UV-Vis) spectroscopy and the LCR Meter Bridge Circuit technique. The fluorescent response improved the photoluminescence (PL) spectral emission peaks according to gamma values. Strong fluorescence peaks appeared with the highest gamma dose. The UV–Vis results revealed a significant red-shift in the absorption edge as gamma doses increased. This shift exhibits a continuous decrease in the energy band gap values (from 3.50 to 2.60 eV for direct transition and from 3.05 to 1.55 eV for indirect transition). This was due to the formation of carbon clusters, which led to an increase in the electrical conductivity and improved the dielectric parameters of the irradiated PMMA films. Among a variety of measurements presented and discussed in the present study, the electrical measurements showed improved electrical characteristics of gamma-irradiated PMMA films.

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