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Positron annihilation study of iodine sorption in acrylonitrile-butadiene-styrene

机译:正电子an灭研究丙烯腈-丁二烯-苯乙烯中碘的吸附

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摘要

The influence of iodine on the free volume of acrylonitrile-butadiene-styrene (ABS) was investigated by positron annihilation lifetime spectroscopy (PALS). The results indicate the filling of free-volume holes, formation of a positronium-iodine compound (PsI(2)/PsI), and possible charge-transfer complexes (CTCs) in the initial stages and the swelling of iodine in the final stages of sorption. The present study also revealed that iodine acts as a chemical quencher of o-Ps. The average size of the free volume suggests that Ig is the predominant species that fills up the free-volume holes during iodination. The diffusion process in the present case shows non-Fickian behavior and deviates from Fujita's free-volume concept as far as the fractional free volume and diffusion coefficient are concerned. (C) 1998 John Wiley & Sons, Inc. [References: 54]
机译:通过正电子an没寿命光谱法(PALS)研究了碘对丙烯腈-丁二烯-苯乙烯(ABS)游离体积的影响。结果表明,空孔的填充,正碘碘化合物(PsI(2)/ PsI)的形成以及初始阶段可能的电荷转移复合物(CTC)以及最终阶段碘的溶胀。吸附。本研究还揭示了碘可作为o-Ps的化学猝灭剂。自由体积的平均大小表明,Ig是在碘化过程中填充自由体积孔的主要物质。在这种情况下,扩散过程显示出非菲克式的行为,并且就分数自由体积和扩散系数而言,与Fujita的自由体积概念有所不同。 (C)1998 John Wiley&Sons,Inc. [参考:54]

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