Compression set in gas-blown condensation-cured polysiloxane elastomers

Patel, Mogon; Chinn, Sarah; Maxwell, Robert S.; Wilson, Thomas S.; Birdsell, Stephen A.

doi:10.1016/j.polymdegradstab.2010.07.038

Title: Compression set in gas-blown condensation-cured polysiloxane elastomers

Journal Article · Wed Dec 01 00:00:00 EST 2010 · Polymer Degradation and Stability

DOI:https://doi.org/10.1016/j.polymdegradstab.2010.07.038· OSTI ID:1124817

Patel, Mogon; Chinn, Sarah; Maxwell, Robert S.; Wilson, Thomas S.; Birdsell, Stephen A.

Accelerated thermal ageing studies on foamed condensation cured polysiloxane materials have been performed in support of life assessment and material replacement programmes. Two different types of filled hydrogen-blown and condensation cured polysiloxane foams were tested; commercial (RTV S5370), and an in-house formulated polysiloxane elastomer (Silfoam). Compression set properties were investigated using Thermomechanical (TMA) studies and compared against two separate longer term ageing trials carried out in air and in dry inert gas atmospheres using compression jigs. Isotherms measured from these studies were assessed using time-temperature (T/t) superposition. Acceleration factors were determined and fitted to Arrhenius kinetics. For both materials, the thermo-mechanical results were found to closely follow the longer term accelerated ageing trials. Comparison of the accelerated ageing data in dry nitrogen atmospheres against field trial results showed the accelerated ageing trends over predict, however the comparison is difficult as the field data suffer from significant component to component variability. Of the long term ageing trials reported here, those carried out in air deviate more significantly from field trials data compared to those carried out in dry nitrogen atmospheres. For field return samples, there is evidence for residual post-curing reactions influencing mechanical performance, which would accelerate compression set. Multiple quantum-NMR studies suggest that compression set is not associated with significant changes in net crosslink density, but that some degree of network rearrangement has occurred due to viscoelastic relaxation as well as bond breaking and forming processes, with possible post-curing reactions at early times.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 1124817

Report Number(s):: LLNL-JRNL-439176

Journal Information:: Polymer Degradation and Stability, Vol. 95, Issue 12; ISSN 0141-3910

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
Foamed polysiloxanes
Compression set
Stability
Ageing
NMR

Title: Compression set in gas-blown condensation-cured polysiloxane elastomers

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