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首页> 外文期刊>Journal of Applied Polymer Science >Surface oxidation of styrene butadiene copolymers: Study by laser ablation and secondary ion mass spectrometry
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Surface oxidation of styrene butadiene copolymers: Study by laser ablation and secondary ion mass spectrometry

机译：苯乙烯-丁二烯共聚物的表面氧化：激光烧蚀和二次离子质谱研究

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摘要

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 CnHmO+ with n = 1-3 and m = 1-3 for polybutadiene and styrene butadiene copolymers, whereas polystyrene was not affected by the aging treatment. The CnHmO+ ions result from butadiene unit degradation. The laser ablation ionization Fourier transform ion cyclotron resonance mass-spectrometry results confirmed the detection of CnHmO+ 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. (C) 2003 Wiley Periodicals, Inc. [References: 16]
机译：离子轰击和激光烧蚀与质谱耦合的能力是研究聚苯乙烯，聚丁二烯聚合物和丁苯橡胶（SBR）共聚物表面热氧化稳定性的独立技术。根据聚合物结构检测表面化学改性。通过静态二次离子质谱仪检测到的降解产物出现在m / z 29、43和55。它们的组成与通式CnHmO +有关，对于聚丁二烯和苯乙烯丁二烯共聚物，n = 1-3和m = 1-3，聚苯乙烯不受时效处理的影响。 CnHmO +离子来自丁二烯单元降解。激光烧蚀电离傅立叶变换离子回旋共振质谱的结果证实了CnHmO +离子的检测。最后，可以认为SBR共聚物的表面热氧化过程始于丁二烯单元降解。丁二烯单元氧化的发展显示出动态的氧化阶段，这与不饱和度的损失相吻合。还研究了聚合物构象（嵌段，支链和无规）对30％苯乙烯SBR化合物表面氧化的影响。 （C）2003 Wiley Periodicals，Inc. [参考：16]

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