Catalyst residue effects on the heterogeneous oxidation of polypropylene

被引：41

作者：

Goss, Ben G.S. ^{[1
,2
]}

Nakatani, H. ^{[1
]}

George, Graeme A. ^{[2
]}

Terano, M. ^{[1
]}

机构：

[1] Graduate School of Materials Science, Japan Adv. Inst. of Sci./Technology

[2] Faculty of Science, Queensland University of Technology, Brisbane

来源：

Polymer Degradation and Stability | 2003年 / 82卷 / 01期

基金：

澳大利亚研究理事会; 日本学术振兴会;

关键词：

Chemiluminescence; Heterogeneous oxidation; Polypropylene oxidation; Thermal oxidation; Ziegler-Natta catalyst;

D O I：

10.1016/S0141-3910(03)00172-1

中图分类号：

学科分类号：

摘要：

The chemiluminescence (CL) curves in oxygen from polypropylene with a residual Ziegler-Natta catalyst Titanium concentration ranging from 0.2 to 4.1 ppm were measured from 100 to 150 °C and it was found that the intensity of CL increased and the time taken to reach the maximum CL intensity decreased with [Ti]. The temperature dependence of the time to maximum CL intensity showed an apparent activation energy, Ea, of 88.1±0.6 kJ/mol that was independent of [Ti] but the pre-exponential factor, A′, decreased with increasing [Ti] according to a power law: A′=4.7×10-8[Ti]-0.3. This has been interpreted as reflecting the power law dependence of [Ti]-0.33 for the distance between residual particles of catalyst as sites for the initiation of heterogeneous oxidation. This has been tested by stochastic modelling of the spreading of oxidation for a range of volume fractions, p0, of infectious sites. This modelling allows pseudo-CL profiles to be constructed over the temperature range 100-150 °C. The modelling has been restricted to p0 values equivalent to higher initial [Ti] but the results show that Ea is independent of [Ti] and A′ shows a power-law dependence of [Ti]-0.29 consistent with the experimental data. © 2003 Elsevier Ltd. All rights reserved.

引用

页码：119 / 126

页数：7

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