Evaluation of the oxidation behavior of polyethylene geomembranes using oxidative induction time tests

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:653332

Hsuan, Y G; Guan, Z ^[1]

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1. Drexel Univ., Philadelphia, PA (United States)

The oxidation of five different high density polyethylene (HDPE) geomembranes was produced in a forced air oven at a temperature of 115 C. The antioxidant packages of three of the geomembranes contained hindered phenols and phosphites types of antioxidants. The antioxidant packages of the other two geomembranes consisted of either thiosynergists or hindered amines together with hindered phenols and phosphites. The consumption of antioxidants after given time periods of oven incubation was monitored by two oxidative induction time (OIT) tests: standard OIT and high pressure OIT together with tensile tests. The results indicated that both OIT tests can effectively track the consumption of hindered phenol and phosphite types of antioxidants. However, for thiosynergists and hindered amines, the high pressure OIT is the appropriate test. The study clearly demonstrated that mechanical properties do not decrease until all (or most) of the OIT value has been depleted. Thus, the reduction of OIT values is the precursor of material degradation.

• OSTI ID: 653332
• Report Number(s): CONF-9611240--; ISBN 0-8031-2483-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIOXIDANTS
LINERS
MECHANICAL PROPERTIES
OXIDATION
POLYETHYLENES
SANITARY LANDFILLS
WEATHERING