Zhen-hua An, Rui Yang. A Novel Aging Evaluation System and the Application to Polyethylene Composites. [J]. Acta Polymerica Sinica 52(2):196-203(2021)
DOI:
Zhen-hua An, Rui Yang. A Novel Aging Evaluation System and the Application to Polyethylene Composites. [J]. Acta Polymerica Sinica 52(2):196-203(2021) DOI: 10.11777/j.issn1000-3304.2020.20150.
A Novel Aging Evaluation System and the Application to Polyethylene Composites
A novel aging evaluation system has been developed to realize a rapid
sensitive
non-destructive aging evaluation of polymer materials under various environmental conditions. Available conditions include irradiation
temperature
oxygen and humidity. This system can be used in the stability evaluation
aging status analysis and aging kinetics measurement by
in situ
detecting trace gaseous degradation products
such as CO
2
in a specially designed reaction cell by FTIR. In this study
polyethylene (PE) composites were used as an example. The generation rate of CO
2
of PE composites during a 4-h
in situ
detection corresponded well to the carbonyl index during a 120-day natural weathering
and the same stability ranking was obtained. In particular
there was a linear relationship between the generation rate of CO
2
and the natural logarithm of carbonyl index
indicating that the generation rate of CO
2
could be taken as a new evaluating index to rapidly detect aging status of PE composites. The activation energy of PE photo-oxidative aging was calculated based on the generation rates of CO
2
at different temperatures in the range of 30−80 °C
which was in agreements with the results reported in literature. The above facts prove the reliability and efficiency of this novel aging evaluation system. Meanwhile
the high sensitivity of the system would enable the determination of activation energies at low temperatures close to the actual operating conditions of materials
avoiding the uncertainty caused by the extrapolation of accelerated results from high temperature.
关键词
原位老化评价聚乙烯复合材料光氧老化动力学
Keywords
In situ aging evaluationPolyethylene compositesPhotooxidative agingKinetics
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