Structural modifications of swift heavy ion irradiated PEN probed by optical and thermal measurements

Devgan, Kusum; Singh, Lakhwant; Samra, Kawaljeet Singh

doi:10.1016/j.radphyschem.2013.02.041

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…The value of activation energy (E u ) is determined by taking the reciprocal of the slope of the linear portion of the curves between the ln (α) and hν. The calculated values of E u for pristine and gamma irradiated samples of makrofol-KG and makrofol-N PCs for various doses are shown in Tables I and II, of the optical and structural properties of the polymers, 18 which may be either due to the formation of carbon-rich clusters or due to the increase in defects in the polymer samples after gamma exposure.…”

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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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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“…Polymer irradiation by swift heavy ions (SHI) irradiation is a convenient method for altering their structural [1,2], thermal [3,4], electrical [5,6], optical [7,8], etc., properties. The interaction of SHI's with a polymer leads to alteration in its structural and chemical composition by processes like main chain scission, intermolecular cross-linking, radical formation [9], generation of unsaturated double bonds and loss of unstable shards [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Induced Electronic and Thermal Effects of 86 MeV Nickel Ions in Bisphenol-A Polycarbonate

Devi

Samra

Singh

2016

Journal of Macromolecular Science, Part B

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Bisphenol-A polycarbonate films were irradiated with 86 MeV swift heavy nickel ions at varying fluences, ranging from 110 11 to 110 13 ions cm 2 , under vacuum at room temperature, to analyze the induced electrical and thermal modifications. AC conductivity measurements and UV-visible spectroscopy, Fourier transform infra-red (FTIR) spectroscopy, thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) techniques were applied to analyze the changes. A significant, exponential increase in conductivity at higher frequency was observed with the increase of nickel ion fluence. UV-visible analysis corroborated the results of the AC conductivity measurement, revealing the increase in size of the carbon clusters embedded in the polymer network, with the increase of heavy ion fluence. FTIR analysis revealed the formation of alkene and alkyne end groups at higher doses, which further supported Downloaded by [University of Nebraska, Lincoln] at 02:20 15 June 2016 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2 the suggestion that the variation in electrical properties induced by the ion irradiation of the polymer was due to development of a carbonaceous phase inside the polymer due to the irradiation. Thermal analysis, i.e. TGA and DSC patterns, showed that chain-scission was the leading phenomena in the heavy ion irradiated polycarbonate samples, resulting in degradation of their thermal stability.

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Radiation induced nano-scale free volume modifications in amorphous polymeric material: a study using positron annihilation lifetime spectroscopy

Kumar

Singh²,

Gupta

et al. 2017

J Radioanal Nucl Chem

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Structural modifications of swift heavy ion irradiated PEN probed by optical and thermal measurements

Cited by 9 publications

References 25 publications

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

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

Induced Electronic and Thermal Effects of 86 MeV Nickel Ions in Bisphenol-A Polycarbonate

Radiation induced nano-scale free volume modifications in amorphous polymeric material: a study using positron annihilation lifetime spectroscopy

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