Optical and microstructural studies on electron irradiated PMMA: A positron annihilation study

Surface topographical and structural analysis of Ag+-implanted polymethylmethacrylate

“…[35] reported that the first halo is due to the scattering from intermolecular components, while the second and third halos show the intramolecular separation in PMMA. Similar XRD patterns for unirradiated and electronirradiated PMMA are presented by Ismayil et al [36] Our results are also in favor of these previously published results, and confirm the amorphous nature of PMMA.…”

“…However, at this fluence, the FWHM of the first halo decreases from 7.18°(at 5 Â 10 14 -ions/cm 2 ) to 6.71°, while for the pristine PMMA it is measured as 6.95°by Gaussian fitting. The decrease in peak broadening is an indication of improvement in the crystallinity of the implanted PMMA with an increase in cross-linking and reformation of chemical bonds [36,38]. These mechanisms increase the degree of ordering of the polymer chains.…”

Effect of Electron Beam Irradiation on Polymers

“…Thermal degradation of PMMA was studied by Barlow et al [22] where the pyrolysis method was used in the temperature range of 340 0 C to 460 0 C. The degradation mechanism was explained on the basis of chain scission of PMMA polymer. The chain scission mechanism by electron beam irradiation is reported by Ismayil et al [23] where amorphization also increased after irradiation with electron beam on PMMA polymer. Moore et al [24] studied the chemical change in PMMA by irradiating deep UV, electron, X-ray and proton beam.…”

Heat treatment effect on erosion behavior of poly(methylmethacrylate) for optical transmittance efficiency

“…The more pronounced modifications in the spectra of heat treated samples were obtained at (2600-3200 cm −1 ) region. The peaks around 2950 cm −1 were assigned to the methylene C H bond (CH 2 and CH 3 ) stretching vibrations [35][36][37][38][39][40]. For heat treated PMMA samples, the increase of CH 2 intensities (v a (CH 2 ) and v s (CH 2 ) at 2930 and 2842 cm −1 ; respectively) accompanied with a decrease of s (CH 3 ) band intensity could be attributed to crosslinking reaction occurred in material.…”