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SUCURTY CLASIFICATION OP V131 PA•IE(I,, DO* got~. understanding of the aging process and have made predictions of future behavior possible. Curves showing a 10 year prediction for tensile stress, strain, and modulus have been included. Two special studies with TP-H1011 propellant have been made to determine the effects of strain and of a second or multistep aging condition on the aging rate. The results indicate that strain levels to 10 percent have no effect on the aging rate of TP-H1011 propellant in up to 48 weeks at temperatures to 1500 F. The two-step aging study shows that it is a simple procedure to predict the effect of a second step aging at any temperature between 750 and 1500 F by determining the equivalent time at the new temperature caused by the first step aging and then following along the new or second temperature aging path for the time at that temperature. Curves have been Included showing the exceptionally good agreement between measured and predicted data for propellant aged at 800 F for 8 years followed by an additional 6 months at 75', 1350, and 150" F. "V UNCLASSIFIED SIECUMITY CLASSIVCATM *Pr THIS PAGCENWh bMal &W* When U.S. Government drawings, specifications, or other data are used for any-purpose other thana-definitely related government procurement operation, the governmeiint thereby incurs no responsibility nor any obligation whatsoever, and ihe fact that the government may have formulated, furnished, or in any way supplied the said drmwings, specifications or other data, is not to be regarded by implication or otherwise, or in any manner licensing the holder or wny other person or corporation, or conveying any rights or permission to manufacture use, or sell any patented Invention that may in-any way be related hereto. k FOREWORD This Tecbnlcal Report was prepared in accordance with data line item B004 of DD Form 1423 "Contract Data Requirements List" to Contract F04611-71-C-0026. The workrepotedherein was done at the Wasatch Division of Thiokol Corporation at Brigham City, Utah, under the direction fof Dr. ionel H. Layton. Robert A. Biggers (MKPB) was the Air Force Project Engineer. "This technical report has been reviewed and is approved for distribution.

No abstract

The effect of solubilized benzene on the viscosity of aqueous solutions of a polysoap, derived from poly‐2‐vinylpyridine and n‐dodecyl bromide was found to be different, both in kind and in order of magnitude, from the simple viscosity depression characteristic of solubilized aliphatic hydrocarbons. As the benzene content of a given solution is increased, the viscosity at first rises, reaches a maximum, and decreases again, below its initial value, until the solution is saturated. The maximum rise in the reduced viscosity increases very strongly with increasing concentration of the polysoap, indicating that the viscosity increase is caused by interactions between polysoap molecules. On the other hand, the reduced viscosity depression at benzene saturation is not sensitive to the polysoap concentration and may therefore be ascribed to a contraction of the individual polysoap molecules. Both at the viscosity maximum and at benzene saturation, the respective amounts of benzene solubilized by unit amount of polysoap were found to be independent of the polysoap concentration. These results are interpreted to mean that the polysoap molecules act as independent solubilizing units, but that their structure is changed by the solubilized benzene is such a way as to strongly affect their mutual interaction. Based on the assumption that the benzene is solubilized both in the hydrocarbon and in the ionic regions of the polysoap molecules, a mechanism for the structure changes which would explain the viscosity maxima is suggested.