The oxidative thermal degradation of polypropylene and the influence of transition metal chelates
β Scribed by J. Holcik; M. Kosik; A.W. Benbow; C.F. Cullis
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 232 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0014-3057
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β¦ Synopsis
Thermoanalytical techniques have been used to investigate the oxidative thermal degradation of polypropylene with special reference to the inhibiting effects of certain metal chelates. The inhibiting efficiency, defined in terms of the difference in temperature between the melting point of the polymer and the temperature of onset of exothermic oxygen uptake, has been determined for each additive using differential thermal analysis (DTA). The exothermicity of polypropylene oxidation has also been estimated.
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Atactic polypropylene was oxidized in solution in the presence and absence of radical initiator over the temperature range of 140' to 200'C under oxygen pressure of 3.3 to 12.4 kg/cm2, and the effects of metal catalyst and additives on the rate, products, and change in molecular weight distribution
## Abstract A number of triazine derivatives, mostly aryloxyβ__s__βtriazines, were prepared, and the effects of these compounds on the thermal oxidative degradation of isotactic polypropylene were examined by conventional oxygen uptake. Almost all triazine derivatives prepared showed a more or less