| || Development of a Polyurethane Binder System Giving a Knottable Composite Solid Propellant
Author : Devadoss, E.
Source : Defence Science Journal ; Vol:35(1) ; 1985 ; pp 1-10
Subject : 620.1 Material Science and Technology
Keywords : Condensation polymers ;Gum stock properties;Stoichiometry;Backbone polyols;Work horse binder system
Abstract : Polyurethane propellants, which constitute one of the 'work-horse' binder systems in modern solid rocketry are easily amenable for tailoring the mechanical properties in terms of variations in the molecular structure of the backbone polyols, the isocyanates and stoichiometry of the reactants. The paper deals with studies in developing an advanced binder system based on poly (oxypropylene glycol) and toluene-di-isocynates, which is capable of accommodating high solids loading and conceding elongation at maximum stress, of more than 125 per cent. The gum-stock properties of the binder are related with those of a low molecular weight version and the results are explained based on the network theory of condensation polymers.