Polymer Aging Techniques Applied to Degradation of a Polyurethane Propellant Binder

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The oxidative thermal aging of a crosslinked hydroxy-terminated polybutadiene (HTPB)/isophorone diisocyanate (IPDI) polyurethane rubber, commonly used as the polymeric binder matrix in solid rocket propellants, was studied at temperatures of RT to 125 C. We investigate changes in tensile elongation, mechanical hardening, polymer network properties, density, O{sub 2} permeation and molecular chain dynamics using a range of techniques including solvent swelling, detailed modulus profiling and NMR relaxation measurements. Using extensive data superposition and highly sensitive oxygen consumption measurements, we critically evaluate the Arrhenius methodology, which normally assumes a linear extrapolation of high temperature aging data. Significant curvature in the Arrhenius ... continued below

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6 p.

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Assink, R.A.; Celina, M.; Graham, A.C. & Minier, L.M. July 27, 1999.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The oxidative thermal aging of a crosslinked hydroxy-terminated polybutadiene (HTPB)/isophorone diisocyanate (IPDI) polyurethane rubber, commonly used as the polymeric binder matrix in solid rocket propellants, was studied at temperatures of RT to 125 C. We investigate changes in tensile elongation, mechanical hardening, polymer network properties, density, O{sub 2} permeation and molecular chain dynamics using a range of techniques including solvent swelling, detailed modulus profiling and NMR relaxation measurements. Using extensive data superposition and highly sensitive oxygen consumption measurements, we critically evaluate the Arrhenius methodology, which normally assumes a linear extrapolation of high temperature aging data. Significant curvature in the Arrhenius diagram of these oxidation rates was observed similar to previous results found for other rubber materials. Preliminary gel/network properties suggest that crosslinking is the dominant process at higher temperatures. We also assess the importance of other constituents such as ammonium perchlorate or aluminum powder in the propellant formulation.

Physical Description

6 p.

Notes

OSTI as DE00009578

Medium: P; Size: 6 pages

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  • 1999 Life Cycle of Energetic Materials, Orlando, FL (US), 09/26/1999--09/29/1999

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  • Report No.: SAND99-1473C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 9578
  • Archival Resource Key: ark:/67531/metadc793156

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  • July 27, 1999

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • April 11, 2017, 1:25 p.m.

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Assink, R.A.; Celina, M.; Graham, A.C. & Minier, L.M. Polymer Aging Techniques Applied to Degradation of a Polyurethane Propellant Binder, article, July 27, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc793156/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.