Functionality Determination of Binder Prepolymers
Final rept. 1 Oct 1966-30 Sep 1968
ESSO RESEARCH AND ENGINEERING CO LINDEN NJ GOVERNMENT RESEARCH LAB
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This is the final report describing research aimed at the development of accurate and reasonably fast procedures to determine the functionality and functionality distribution of prepolymers currently of interest to the Air Force. The effect of solute concentration, solvent type and temperature on number average molecular weight measurements by VPO was studied for a series of binder prepolymers. A number of micro-methods were developed which can accurately determine the equivalent weight of hydroxy- and carboxy-functional prepolymers on a 50 to 100 mg sample size. A method was also developed to determine the functionality distribution of binder prepolymers. The method is based on the adsorption of prepolymer on activated silica gel and subsequent selective desorption by stepwise elution using solvent mixtures of progressively greater elution power. The following eight prepolymers were characterized on this program OH-Telagen-S, COOH-Telagen-S, P-BEP, 3Ms hydroxy-functional perfluoroalkylene oxide prepolymer, COOH-Polyisobutylene, Thiokols CNR-Nitroso Terpolymer, COOH-Butarez and Sinclairs Poly B-D. Typical prepolymer samples contain from 0-7 nonfunctional polymer, and 16 to 33 monofunctional polymer.
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