Chemiluminescence and inhibited oxidation of polypropylene

The efficiency of mixtures of the commercial antioxidants, Hostanox OSP 1, Irganox 1010 and distearylthiodipropionate was examined by chemiluminescence and oxygen uptake methods. Lower induction periods of oxidation, observed by the chemiluminescence method at 190°C, were found with samples which contain more of the less volatile additives. In accordance with earlier findings this is due to the surface nature of chemiluminescence which yields results close to those of the kinetic region.     

Chemiluminescence in the course of methyl ethyl ketone oxidation by ozone in acidic aqueous solutions

Chemiluminescence in the visible spectral region is observed in the course methyl ethyl ketone oxidation by ozone in neutral and acidic aqueous solutions. The spectral composition of the chemiluminescence is studied. On going from neutral to acidic aqueous solutions of methyl ethyl ketone, the initial intensity of the signal increases and the kinetics of a decrease in the chemiluminescence intensity changes. A radical scheme of the process is proposed to explain the results obtained.Translated from Kinetika i Kataliz, Vol. 45, No. 6, 2004, pp. 829–835.Original Russian Text Copyright © 2004 by Zimin, Gusmanov, Khursan.     

Chemiluminescence accompanying the oxidation of hemicelluloses

On the series of hemicelluloses such as xyloglucans and xylans the effect of O-CH₃ substitution and initial molar mass on chemiluminescence intensity measured under non-isothermal conditions in oxygen and nitrogen from 40 to 220 °C was examined. It was ascertained that the rate constants of oxidation determined from non-isothermal chemiluminescence experiments describe quite well the relative stability of the respective hemicellulose. Similarly as in the case of cellulose and pullulan increasing molar mass has an adverse effect on the intensity of the light emission.     

Chemiluminescence during the oxidation of homogentisic acid

Chemiluminescence (CL) that accompanies the autooxidation of homogentisic acid in the presence of an alkali was studied. Data on the red shift of the CL spectrum at increased medium polarity and the dependence of the luminescence intensity and light efficiency on the reagent concentration were obtained. A CL emitter is supposed to be an excimer formed by two radical dianion molecules of homogentisic acid. Chemiluminescence of an excimer occurs during coproportionation.     

Chemiluminescence in the oxidation of cyclooctene by molecular oxygen

Chemiluminescence kinetics have been examined for the oxidation of cyclooctene by molecular oxygen. State University “L'vivs'ka Politekhnika,” 12 ul. S. Bandery, L'vov-13 290646, Ukraine. Translated from Teoreticheskaya i éksperimental'naya Khimiya, Vol. 35, No. 6, pp. 354–356, November–December, 1999     

Chemiluminescence in inhibited oxidation reactions,and the activity of inhibitors Communication 1. Theory of chemiluminescent methods of finding the activity of inhibitors

Summary Chemiluminescence methods are proposed for measuring the activity of inhibitors, and verifying the mechanism by which they act in liquid phase oxidation.This paper is published on the basis of a resolution taken by a meeting of the principal editors of the journals of the Academy of Sciences, USSR, held luly 12, 1962, as the dissertation work of O. N. Karpukhin.     

Chemiluminescence in the oxidation of phenyl-substituted silole radical anions and dianions

The emittor in the chemiluminescent electron transfer oxidation of the radical anions and dianions of 1,1-dimethyl-2,5-diphenyl- and 1,1-dimethyl-2,3,4,5-tetraphenylsilole is shown to be the parent compound. Chemiluminescence is reported in the oxidation of the radical anions of 1,2,5-triphenylphosphole, 2,3,4,5-tetraphenylthiophene-5-dioxide and 1,1-diphenyldibenzosilole.     

Temperature dependence of the inhibited oxidation parameters of polyethylene

Theoretical evaluation of the durability of a stabilized polymer, based on experimental results obtained at elevated temperature or oxygen pressure, is verified for the oxidation of polyethylene.     

Chemiluminescence of 1,2-dioxetanes,the photosensitized oxidation products of triallate

Conclusions Degradation of the triallate herbicide under the action of singlet oxygen proceeds through unstable 1,2-dioxetanes, the decomposition of which is accompanied by chemiluminescence and leads to formation of chloroanhydride and phosgene.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2016–2019, September, 1987.     

痕量动物油和植物油的区分检验研究

采用碱催化甲酯化的前处理方法,应用气相色谱-质谱联用技术对动物油和植物油的区分检验进行了研究。实验检出了6种主要脂肪酸:肉豆蔻酸、棕榈油酸、棕榈酸、亚油酸、油酸、硬脂酸。分析了动物油与植物油在成分及相对含量上的差异,并且找出了动物油和植物油在不饱和度上的差别。根据动物油与植物油的差异点,可以对动物油和植物油进行区分。