Surface oxidation of styrene butadiene copolymers: Study by laser ablation and secondary ion mass spectrometry

Abstract

ABSTRACT:The capabilities of ion bombardment and laser ablation coupled to mass spectrometry as independent techniques to investigate the surface thermooxidative stability of polystyrene, polybutadiene polymers, and styrene butadiene rubber (SBR) copolymers were investigated. Surface chemical modifications were detected according to the polymeric structure. The degradation products detected by static secondary ion mass spectrometry appeared at m/z 29, 43, and 55. Their compositions were related to the general formulae C n H m O ϩ with n ϭ 1-3 and m ϭ 1-3 for polybutadiene and styrene butadiene copolymers, whereas polystyrene was not affected by the aging treatment. The C n H m O ϩ ions result from butadiene unit degradation. The laser ablation ionization Fourier transform ion cyclotron resonance mass-spectrometry results confirmed the detection of C n H m O ϩ ions. Finally, it may be considered that the surface thermooxidative process of SBR copolymers begins with butadiene unit degradation. The development of butadiene unit oxidation showed a dynamic oxidation phase, which coincided with a loss of unsaturation. The influence of the polymer conformation (blocked, branched, and random) on the surface oxidation for 30% styrene SBR compounds was also studied.

Variable Lysozyme Transport Dynamics on Oxidatively Functionalized Polystyrene Films

“…At this power density, laser-induced oxidation of polystyrene is unlikely to occur, given that power densities orders of magnitude greater are needed to oxidize polystyrene. 64 Probe solutions (100 μL) were drop-cast onto the films and immediately measured thereafter in a controlled environment with a relative humidity of 55%. The density of emitters on the polystyrene interface did not change over time for represented measurements.…”

Accelerated ageing of styrene-butadiene rubber nanocomposites stabilized by phenolic antioxidant

“…Samples unaged and aged during 28 days at 70°C were selected as representative samples and were analyzed using attenuated total reflectance technique. It was previously reported that thermal ageing is closely associated with the butadiene part of the SBR copolymer . After a long periods of oven‐ageing, no appreciable changes occurred in spectral region associated with styrene entities, and the peak at 697 cm −1 , assigned to out‐of‐plane bending vibration of the styrene ring, was used here as an internal standard .…”

Investigation of polymer‐based composites by laser desorption/ionization study of their photo‐oxidative aging

“…The mechanical stress, the temperature, the moisture, UV or visible radiation, bombardment by ionizing radiation, or aggressive and corrosive environment may be responsible of the degradation of its properties. 1 Such degradation may induce the modification of the material esthetic (color alteration) [2][3][4] or its mechanical properties. [5][6][7] Amongst polymers, polybutadiene (PB) is of particular interest as PB or its co-polymers with styrene are among the most used polymers especially in the tire and flooring industry.…”

“…2,[12][13][14][15][16][17] Generally, thermal and photo-oxidative aging induce the same kinds of effect, which is the formation of oxygenated species and the crosslinking of the polymer backbone. 4,5,10,11,[18][19][20][21][22][23][24] More specifically, UV irradiation leads to the abstraction of one of the most labile hydrogen atoms to produce an alkyl radical. 5,10,[21][22][23][24][25][26][27][28] This radical reacts with molecular oxygen to ultimately lead to the formation of oxygenated compounds such as ketones, aldehydes or carboxylic acids.…”

“…Mass spectrometry, 4,9,34,36,37 and especially laser desorption/ ionization mass spectrometry (LDI-MS), 2,4,12,37 have been extensively used. More specifically, LDI-MS allows a solid sample to be characterized without need of a solubilization step.…”