Technical Paper Archive


This site contains all papers presented at Rubber Division, ACS Technical Meetings from 2000-2018. Meetings prior to 2000 are incomplete and papers are added as they are digitized.


For older papers not listed here, please send your request, including Meeting Year, Title, Author, and Paper # to: cbrady@rubber.org


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The Accelerated Heat Aging of Aircraft Inner Tubes for Shelf life Determination. Part 1: Butyl Rubber

C01 pazur

Event: 200th Technical Meeting - Fall 2021
Location: Pittsburgh, PA
Date: October 05, 2021
Author: Richard Pazur
Paper Number: C01

Price: $20.00

  • Butyl rubber inner tubes used in military aircraft must meet the property specification requirements of Aerospace Standard AS50141. Their nominal shelf life is 10 years from the date of manufacturing but it is known that this value can be influenced by the butyl type (i.e. regular versus halogenated). In part 1 of this investigation, a butyl rubber inner tube will be evaluated for its shelf life. Accelerated heat aging took place from 40 to 120°C for varying lengths of time. Hardness and mechanical properties were measured on the aged samples. Double Quantum Nuclear Magnetic Resonance was employed to elucidate crosslink density and distribution changes as a function of heat aging. Time-Temperature Superposition (T-TS) of the aged data coupled with the Arrhenius approach were used to determine an approximate shelf life. The low temperature aging data were more appropriate to this end due to the presence of non-Arrhenius aging behavior. Crosslinking reactions are more prominent in the low temperature regime whereas chain scission reactions appear to occur more frequently at higher temperatures.

    Papers from 200th Technical Meeting - Fall 2021

    Items from 200th Technical Meeting - Fall 2021