Hardened Solar Array High Temperature Adhesive.
Final rept. Apr 80-Jan 81,
HUGHES AIRCRAFT CO LOS ANGELES CALIF SPACE AND COMMUNICATIONS GROUP
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Ultrahigh molecular weight m-carborane-siloxane polymers exhibit good stability at high temperature in vacuum. This thermal stability coupled with desirable viscoelastic properties make these materials attractive as thermoplastic adhesives for solar cell attachment to solar panel substrates, especially for hardened systems. Unfortunately, development of a reproducible chemical synthesis for these polymers has eluded all efforts in recent years. In this current effort to reproducibly prepare these ultrahigh molecular weight elastomers, major progress has been made. This progress has resulted from careful and orderly experimentation involving the main elements of the problem, namely a purification of reactants and solvents, b preparation, workup, and characterization of monomers, c preparation and workup of prepolymers, d development of a trace level, silanol end group analysis for estimating prepolymer advanceability, and e prepolymer advancement to the final polymer. Significant additional progress in the prepolymer preparation and advancement steps is still required for definition of a reproducible process for preparing the ultrahigh molecular weight material. Pending achievement of such progress, adhesive formulation efforts are limited. Author
- Polymer Chemistry