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首页> 外文期刊>Journal of Applied Polymer Science >The Second Time Derivative Analysis of Chemiluminescence Emission Profiles and Its Application to the Accurate Determination of Oxidative Induction Times
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The Second Time Derivative Analysis of Chemiluminescence Emission Profiles and Its Application to the Accurate Determination of Oxidative Induction Times

机译：化学发光光谱的二次导数分析及其在氧化诱导时间精确测定中的应用

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摘要

The technique of second time derivative (STD) analysis is developed and applied to the chemiluminescence (CL)profiles of two polypropylene (PP) formulations and a 5% w/w blen"d of polybutadiene (PBD) in PP to assess this novel method of analysis as a means of reliably determining the oxidative induction time (OIT) of polymers. It is proposed that the STD technique, when used in conjunction with the integrated CL profile, can enable evaluations of the OIT to be made that are less subjective than those made using the conventional extrapolation method. This is particularly so in systems that exhibit a gradual onset towards autoacceleration and/or convoluted CL profiles. Chemiluminescence profiles of the PBD-PP blend that were obtained at different temperatures were subjected to STD analysis, and Arrhenius plots of the data were made. The results are consistent with the notion that the PBD and PP phases oxidize almost independently. The activation energies for the oxidation of the PBD and PP phases were calculated to be 200 = 31 kJ mol-l and 146 = 9 kJ mol- respectively. The higher activation energy for the PBD phase is partly attributed to the greater partitioning of thermal stabilizer in this phase.
机译：开发了二次导数（STD）分析技术，并将其应用于两种聚丙烯（PP）配方和5％w / w混合的聚丁二烯（PBD）在PP中的化学发光（CL）曲线，以评估该新方法作为可靠确定聚合物氧化诱导时间（OIT）的一种方法，建议将STD技术与集成的CL曲线结合使用时，可以使OIT的评估主观性低于使用常规外推法制备的那些化合物，尤其是在表现出逐渐向自动加速和/或回旋的CL轮廓开始的系统中尤其如此，对在不同温度下获得的PBD-PP共混物的化学发光轮廓进行了STD分析，并进行了Arrhenius绘制了数据图，结果与PBD和PP相几乎是独立氧化的观念相符。 PP相经计算分别为200 = 31 kJ mol-1和146 = 9 kJ mol-1。 PBD相的较高活化能部分归因于该相中热稳定剂的更大分配。

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