Influence of ultraviolet radiation on polystyrene

Microcrystallization of Atactic Polystyrene Induced by Photooxidation Aging

“…By conducting photooxidation aging, hygrothermal aging, and hot-air aging experiments on aPS, it is interesting to find that PS microcrystals were only produced during photooxidation aging. The crystallization behavior of polystyrene was also observed in radiation experiments by Monsores et al [10] However, Monsores et al did not mention the configuration or grade of polystyrene used, and our work builds on the high molecular weight atactic polystyrene. Compared to those experiments, our results provide more detailed data for the phenomenon of crystallization.…”

“…The crystallization behavior of polystyrene was also observed in radiation experiments by Monsores et al. [ 10 ] However, Monsores et al. did not mention the configuration or grade of polystyrene used, and our work builds on the high molecular weight atactic polystyrene.…”

Single-Particle Analysis of the Photodegradation of Submicron Polystyrene Particles Using Infrared Photothermal Heterodyne Imaging

“…Concurrently, these reactions led to the formation of several new bands in the carbonyl region between 1650 and 1800 cm –1 , as illustrated in Figure a. Some of these bands have been identified in previous studies on the photodegradation of PS. ,,,,,,,− The 2D-COS asynchronous plot was used to deconvolute and identify CO bands between 1650 and 1800 cm –1 (Figure b). Several bands were identified, including 1654, 1665, 1674–1677, 1684, 1694, 1701, 1709, 1714–1717, 1720, 1728–1732, 1742–1744, 1751, 1757, 1760, 1770, 1774–1778, 1780, 1783–1786, 1791, and 1798 cm –1 .…”

“…Last, individual infrared absorption spectra were acquired by positioning pump and probe foci on individual particle positions and scanning incident pump wavelengths across the optical parametric oscillator’s tuning range. The spectral data was normalized to the laser power to account for any intensity contributed by the laser and then divided by the peak intensity at 1600 cm –1 as a reference − because it was not observed to change during irradiation. This enabled a comparison between spectra obtained at various irradiation times for different particles.…”

Investigation of electrical ageing effects on the structural and electrical properties of polystyrene by charging and discharging current method

“…Ageing of PS have been studied in last few decades to understand the relationships between environmental conditions and physical and thermomechanical properties of PS materials. De Castro Monsores et al [6] showed that PS underwent structural modification affecting its mechanical performances when it is exposed to ultraviolet (UV) radiation in an oxidizing atmosphere. Tanaka et al [7] also demonstrated that the physical ageing changed the thermal properties of PS.…”