Accession Number : ADA101033


Title :   Hardened Solar Array High Temperature Adhesive.


Descriptive Note : Final rept. Apr 80-Jan 81,


Corporate Author : HUGHES AIRCRAFT CO LOS ANGELES CALIF SPACE AND COMMUNICATIONS GROUP


Personal Author(s) : Beard,C ; Sherwood,C ; Basiulis,D ; Magallanes,P ; Wolff,G


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a101033.pdf


Report Date : Apr 1981


Pagination or Media Count : 50


Abstract : 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)


Descriptors :   *SYNTHESIS(CHEMISTRY) , *SILOXANES , *THERMOPLASTIC RESINS , *ADHESIVES , MOLECULAR WEIGHT , ELASTOMERS , PURIFICATION , SOLAR CELLS , REPRODUCIBILITY , CHEMICAL ANALYSIS , FORMULATIONS(CHEMISTRY) , SOLAR PANELS , HARDENED STRUCTURES , CHEMICAL RADICALS , CARBORANES , TRACER STUDIES


Subject Categories : Polymer Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE