Structural modification of poly(methyl methacrylate) by proton irradiation

Surface properties and structures of diblock and random copolymers with perfluoroalkyl side chains

“…The absorbance bands based on the methacrylate backbone, such as the C=O stretching vibration around 1730 cm −1 and CH 2 rocking around 810 and 750 cm −1 , were observed in all spectra[27]. The spectra of PMMA-b-PFEMA and PMMAr-PFEMA resembled each other, and the absorption around 1200-1270 cm −1 for C-F stretching vibration bands[16] Fig.…”

Investigation on electrical properties of thermally aged PMMA by combined use of FTIR and impedance spectroscopies

“…Only the region from 1800 to 800 cm −1 is investigated for identifying the presence of specific functional groups in PMMA aged samples. (1240, 1265 cm −1 ) correspond to the C O stretching vibrations of ester groups [2][3][4][5]. The absorptions around 1440 and 1480 cm −1 characterize respectively the asymmetric bending vibrations of (C CH 3 ) and (C CH 2 ) bonds.…”

Fabrication of optical waveguides using proton beam writing

“…This peak in vacancies is the predominant factor for the increase in refractive index in this region. In glasses and polymers the vacancies produced in this region result in re-ordering of the bonds usually resulting in a compaction of material [19]. For polymers the effect is even more pronounced and is usually accompanied by some out gassing of material, further increasing the compaction and refractive index [20].…”