Accession Number:

ADA134286

Title:

Hybrid Fluorosilicones for Aircraft Fuel Tank Sealants. Part 4. Synthesis of Fluorocarbon and Fluorocarbon Ether Hybrid Fluorosilicone Polymers.

Descriptive Note:

Final rept. 25 Jan 73-25 Jan 74,

Corporate Author:

DOW CORNING CORP MIDLAND MICH ADVANCED RESEARCH LAB

Report Date:

1974-05-01

Pagination or Media Count:

73.0

Abstract:

Two fluoroether silicone FES elastomeric polymers were synthesized, and cured research samples were delivered to AFML for evaluation. These polymers were based on the -CF22OCF2NOCF22- n 2,5 backbone unit. A one-step synthesis of ICF22OCF22OCF22I from commercially available starting materials was demonstrated about 110 g of this fluoroether was prepared, and over 500 g of ICF22OCF25OCF22I was synthesized. Coupling studies of the alpha, omega-diiodoperfluoroethers have shown 1 A good yield 71 of dimer and trimer is produced by photolysis of ICF22OCF25OCF22IHgC7F16 2 Fair yields ca. 40 of dimer and trimer are produced by heating copper-bronze powder with the ether, but some hydrogen endblocked materials are also produced 3 Heating with Hg or CuHg produces mercury-inserted fluoroether oligomers. The following samples of LSFCS-210 copolymer sealants were prepared and submitted to AFML for evaluation 1 pound LSFCS-210 0.91.0, unformulated, 1 pound LSFCS-210 0.91.0, formulated, Research sample LSFCS-210 1-1.21.0, unformulated, Research sample LSFCS-210 1.51.0 unformulated. In addition, Dow Corning Corporation has attempted to prepare samples of alternating LSFCS-210 copolymers having the following ratios 11, 1.51, 21. Analyses are pending.

Subject Categories:

  • Aircraft
  • Polymer Chemistry
  • Adhesives, Seals and Binders
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE