Modifications of structural, optical and chemical properties of Li3+ irradiated polyurethane and polyetheretherketone

Singh, Paramjit; Ali, Sajid; Kumar, Rajesh

doi:10.1016/j.radphyschem.2013.09.014

Cited by 26 publications

(9 citation statements)

References 36 publications

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“…A shift in the absorption edge towards longer wavelength was observed for the ion irradiated samples; the shift was gradually increasing from lower to higher fluences. This behavior is caused by the creation of free radicals and formation of extended system of conjugated bonds in irradiated polymers [45][46][47]. The shift in absorption band is associated to the π-π * electronic transitions in the studied wavelength region [48].…”

Section: Uv-visible Studiesmentioning

confidence: 97%

Influence of SHI upon nanohole free volume and micro scale level surface modifications of polyethyleneterephthalate polymer films

Kumar

Singh

2015

Applied Surface Science

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Section: Uv-visible Studiesmentioning

confidence: 97%

Influence of SHI upon nanohole free volume and micro scale level surface modifications of polyethyleneterephthalate polymer films

Kumar

Singh

2015

Applied Surface Science

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“…The spectra shows a shift in the optical absorption edge of irradiated samples toward red end of the spectrum, which increases with the increase in gamma dose, indicating a growing concentration of conjugated system of bonds. 6 Owing to this shift, the optical band gap energy (E g ) of the polymers decreased, which was calculated by applying Tauc's relation 14,15 for direct transitions as per the following equation:…”

Section: Uv-vis Studiesmentioning

confidence: 99%

Gamma Radiation Induced Modifications on Physicochemical Properties of Makrofol (KG and N) Polycarbonate

et al. 2015

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Makrofol (KG and N) polycarbonates (PCs) are the most versatile solid-state nuclear track detectors. These polymers were exposed to gamma radiation of doses ranging from 250 to 1000 kGy. The pristine and exposed samples were characterized by X-ray diffraction (XRD), UV-vis spectrophotometry, and Fourier transform infrared spectrophotometry for the structural, optical, and chemical studies, respectively. The XRD studies showed that crystallite size for exposed samples of makrofol-KG PC decreased from 64.7 to 57.9Å and for makrofol-N PC it increased from 19.1 to 21.1Å. The band gap energy decreased from 4.40 to 4.07 eV for makrofol-KG and from 4.26 to 3.83 eV for makrofol-N after the gamma exposure. The number of carbon atoms per conjugation length as obtained from UV-vis studies was increased in both cases. The activation energy showed fluctuations for exposed samples of both polymers. The intensity of various absorption bands of the infrared spectra decreased at some doses for both the PCs, indicating the change in the chemical properties of the exposed samples. C 2015 Wiley Periodicals, Inc. Adv Polym Technol 2015, 34, 21510; View this article online at wileyonlinelibrary.com.

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“…23,24 The value of k is 0.9 in the present case. 25,26 The calculated values are given in Tables II-IV for carbon, lithium, and gamma irradiated samples, respectively. The values of the crystallite size for peaks at 14°, 16.9°, and 25.5°h ave been observed to be modified after the radiation treatment (carbon, lithium, and gamma exposure).…”

Section: X-ray Diffraction Studiesmentioning

confidence: 99%

Impact of Swift Heavy Ions and Gamma Radiation upon Optical, Structural, and Chemical Properties of Polypropylene Polymer Films

Gupta

Singh

et al. 2015

Adv Polym Technol

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ABSTRACT:The present work focuses on the effects of two different ions (70 MeV carbon and 50 MeV lithium) and gamma radiation upon the structural, optical, and chemical properties of 125-μm thick polypropylene (PP) polymer films. The different samples of PP were irradiated with ions to the fluences in the range 10 11 -10 13 ions/cm 2 and exposed to gamma radiation of doses in the range 100-1250 kGy. A comparative study is carried out upon different parameters of irradiated polymer samples such as crystallite size and band gap energy. The structural properties are effectively modified by the ions irradiation, whereas gamma exposure shows insignificant changes in this regard; however, gamma exposure is observed to be effective in gradually decreasing the band gap energy of the PP samples with an increase in the gamma dose. The formation of new chemical bands is observed in the ion-irradiated and gamma-exposed PP polymer samples. C 2015 Wiley Periodicals, Inc. Adv Polym Technol 2015; View this article online at wileyonlinelibrary.com.

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Modifications of structural, optical and chemical properties of Li3+ irradiated polyurethane and polyetheretherketone

Cited by 26 publications

References 36 publications

Influence of SHI upon nanohole free volume and micro scale level surface modifications of polyethyleneterephthalate polymer films

Influence of SHI upon nanohole free volume and micro scale level surface modifications of polyethyleneterephthalate polymer films

Gamma Radiation Induced Modifications on Physicochemical Properties of Makrofol (KG and N) Polycarbonate

Impact of Swift Heavy Ions and Gamma Radiation upon Optical, Structural, and Chemical Properties of Polypropylene Polymer Films

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