Ion-beam effects on optical and rheological properties of polystyrene

Calcagno, L.; Compagnini, Giuseppe; Fóti, G.

doi:10.1103/physrevb.46.10573

Cited by 71 publications

(70 citation statements)

References 10 publications

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“…The electron in the p bond undergoes photoexcitation from ground to higher energy state (p / p* transition) and cleaves the bond. 11,21,22 This consequently generates active radicals at the C-Oc which then reacts further with the side chain of the adjacent monomer units forming crosslinked structure via oxygen bridge.…”

Section: Resultsmentioning

confidence: 99%

Degradation of ultra-high molecular weight poly(methyl methacrylate-co-butyl acrylate-co-acrylic acid) under ultra violet irradiation

et al. 2017

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A new acrylic terpolymer, poly(methyl methacrylate-co-butyl acrylate-co-acrylic acid) [P(MMA-co-BA-co-AA)] of ultra-high molecular weight (UHMW) was synthesized via seeded emulsion polymerization. This polyacrylic showed good film properties; high transparency, water resistance and mechanical flexibility that may suitable for many environmental based applications such as coating, packaging, label sensors etc. In order to access the photo-stability of this material for environmental application, studies were conducted under UV illumination of a short-wavelength (l ¼ 254 nm) in air. The responses were collected at different irradiation times by using several characterization techniques: infrared/UV-visible spectroscopy (FTIR/UV-Vis), gel permeation chromatography (GPC), atomic force microscopy (AFM) and thermogravimetric analysis (TGA). Two distinguishable structures, cross-linked and fragmented chains, were formed under photo-irradiation at different times of exposure. The formation of cross-linked structures at short irradiation times (t < 60 min) increases the chain length as validated from the increase in average-molecular weight (M w ), whilst at longer irradiation time the fragmentation causes a decrease in the chain length (decrease in M w ). Only the chain scission at longer irradiation time (t > 60 min) causes the copolymer to degrade. The centre of reaction was identified at the pendent group and no effect of main chain destabilization was observed throughout the experimental condition. The occurrence of chain cleavage during photo-degradation causes chain-chain separation, as visually seen under the imaging technique and this coincides with the observed drop in thermal stability. Photo-oxidation was also proposed to occur simultaneously with photo-degradation as the irradiation was performed in air.

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Section: Resultsmentioning

confidence: 99%

Degradation of ultra-high molecular weight poly(methyl methacrylate-co-butyl acrylate-co-acrylic acid) under ultra violet irradiation

et al. 2017

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“…This includes breaking covalent bonds, scissoring or crosslinking of polymer chains, and formation of derivatives and volatile species. [1][2][3][4] The application of these radiation-induced chemical reactions owes its main value to various properties such as improved hardness, wear resistance, or electrical conductivity that cannot be achieved chemically. 5 Here, we report on the irradiation of two different polymers with heavy ions of energy of several hundred MeVs.…”

Section: Introductionmentioning

confidence: 99%

Chemical degradation of polyimide and polysulfone films under the irradiation with heavy ions of several hundred meV

Steckenreiter

Balanzat

Fueß

et al. 1999

J. Polym. Sci. A Polym. Chem.

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“…6 The bond scission and intermolecular cross-linking are the main results of high-energy ion irradiation on the polymer surface that results in the remarkable macroscopic changes in the polymer materials. [7][8][9][10][11] Generally, the ion fluence used for the polymer irradiation is in the range between 10 9 and 10 14 ions/cm 2 . The high ions fluence leads to the destruction of polymer and also results in the carbonization.…”

Section: Introductionmentioning

confidence: 99%

Effects of Li³⁺ and Ni⁹⁺ Ion Beams on Polyether Sulfone Polymer

et al. 2013

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High-energy ion beam irradiation of polymer is an effective technique to enhance the optical, structural, and mechanical properties. So polyether sulfone (PES) films were irradiated by lithium ions (energy 45 MeV, charge state 3+) and nickel ions (energy 120 MeV, charge state 9+) with fluence varying from 3 × 10 10 to 3 × 10 12 ions/cm 2 . Ion-induced optical, structural, and surface modifications were studied by ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffractrometer (XRD), and atomic force microscopy (AFM). PES suffers degradation under irradiation. It is observed that the band gap of the polymer decreases with ion fluence. The decrease in the band gap was found to be more in the case of the Ni ion beam as compared to the Li ion beam. The intensity of the infrared bands, characteristics of different chemical functional groups are found to be decreased with swift heavy ion (SHI) irradiation. Significant loss of crystallinity was observed at higher fluences. Atomic force microscopy showed that the roughness of the polymer surface increased with increasing fluence C

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Ion-beam effects on optical and rheological properties of polystyrene

Cited by 71 publications

References 10 publications

Degradation of ultra-high molecular weight poly(methyl methacrylate-co-butyl acrylate-co-acrylic acid) under ultra violet irradiation

Degradation of ultra-high molecular weight poly(methyl methacrylate-co-butyl acrylate-co-acrylic acid) under ultra violet irradiation

Chemical degradation of polyimide and polysulfone films under the irradiation with heavy ions of several hundred meV

Effects of Li³⁺ and Ni⁹⁺ Ion Beams on Polyether Sulfone Polymer

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Ion-beam effects on optical and rheological properties of polystyrene

Cited by 71 publications

References 10 publications

Degradation of ultra-high molecular weight poly(methyl methacrylate-co-butyl acrylate-co-acrylic acid) under ultra violet irradiation

Degradation of ultra-high molecular weight poly(methyl methacrylate-co-butyl acrylate-co-acrylic acid) under ultra violet irradiation

Chemical degradation of polyimide and polysulfone films under the irradiation with heavy ions of several hundred meV

Effects of Li3+ and Ni9+ Ion Beams on Polyether Sulfone Polymer

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Effects of Li³⁺ and Ni⁹⁺ Ion Beams on Polyether Sulfone Polymer