TITLE:
Some Practical Aspects of the Oxidative Stability of Polypropylene Pipes
AUTHORS:
A. A. Apostolov, S. Djoumaliisky
KEYWORDS:
Polypropylene, Material Testing, Oxidation Induction Time, Oxidation Induction Temperature
JOURNAL NAME:
Materials Sciences and Applications,
Vol.5 No.8,
June
30,
2014
ABSTRACT:
The oxidation time and oxidation temperature of a total of 20 specimens
with unknown pre-history from various manufacturers of polyethylene and
poly(ethylene-co-propylene) are determined. The specimens are in the form of
fittings used in piping. The specimens are divided into two groups
corresponding to their melting temperature and polyethylene content in the
copolymer, respectively. The oxidation activation energy for the two groups is
calculated. Reasonable relationship between the measured oxidation time and the
time, calculated on the base of the measured oxidative temperature, is obtained.
The scattering of experimental data is thoroughly examined and some
recommendations aiming at improving the results are suggested. Specific
recommendations are given for the cases of technological and post consummative
piping waste. The paper critically estimates the accuracy in the measured
oxidation time and temperature as well as their mutual relation.