聚乙烯等温氧化过程的化学发光光谱及动力学特性的研究

聚乙烯等温氧化过程的化学发光动力学曲线呈典型的双“S”形变化.反应一开始就出现的小的发光强度的峰值过程,与试样的氧化程度有关,接着出现的发光强度大得多的第二个和第三个峰值过程,对应于自催化氧化反应. 在480-725nm光谱范围依次观测到聚乙烯化学发光动力学曲线中的第一和第三个峰值过程,第二个峰值过程仅在330-400nm光谱范围观测到,在400-480nm光谱范围可观测到所涉及的三个峰值过程。 最后,讨论了可能的发光机制.

STUDY OF THE CHEMILUMINESCENCE SPECTRA AND ITS KINETIC PROPERTIES OF POLYETHYLENE DURING ISOTHERMAL OXIDATION

The chemiluminescence kinetic properties were studied in the different spectral regions during oxidation of polyethylene. It is shown that the chemiluminescence from oxidation of polyethylene belongs to both spectral regions in which there are three peak processes. The processes of the first and the third peak were observed in the 480-725nm region successively. The process of the second peak can only by observed in the 330-400nm region. All of the three processes were observed in the 400-480 nm region.Among the three processes, the first peak process is related to the degree of oxidation of the sample, and the second and the third peak processes correspond to autocatalytic oxidation reaction.Possible chemiluminescence mechanism is discussed during oxidation of polyethylene.