Influence of diphenylsiloxane content on the dynamic creep response of filled, crosslinked polysiloxanes
- Eastman Kodak Company, Rochester, NY (United States)
Crosslinked polysiloxanes are excellent materials for high temperature applications because of their thermal stability. Addition of inorganic oxide fillers is necessary in order to achieve desired mechanical properties, however. The fillers can contribute mechanical, as well as chemical, degradation sites that influence the thermal stability of the resulting elastomers. Further, application of a dynamically varying mechanical load on the elastomer can accelerate the rate of degradation. In this contribution, the ability of polysiloxanes; elastomers to withstand application of cyclic loads at elevated temperature is examined. The dynamic creep response of poly(diphenylsiloxane-co-dimethylsiloxane)s is characterized as a function of diphenylsiloxane content. Changes in the balance of degradation reactions that give mechanical property changes and the creep response are observed with changing diphenylsiloxane content. Changes in crosslink density with cyclic loading are observed and characterize changes in network structure. Stabilization of the siloxane bonds by the phenyl groups is suggested as an underlying reason for the changes in creep response and network structure of the crosslinked copolymers with varying diphenyisiloxane content.
- OSTI ID:
- 370928
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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