Reference

Study of the gelation of a system triol/diacid/monoacid with substitution effect on the triol

Study of the gelation of a system triol/diacid/monoacid with substitution effect on the triol. Durand, Dominique; Bruneau, Claude Marcel (Lab. Phys.-Chim. Macromol., Fac. Sci., Le Mans, Fr.). Makromol. Chem., 178(12), 3237-48 (French) 1977. CODEN: MACEAK. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) The influence of the substitution effect of the OH groups of trimethylolpropane (I) [77-99-6] on the gelation of a system of I, adipic acid [124-04-9], and lauric acid (II) [143-07-7] was detd. using a new general formulation of Flory's gelation criterion to derive a crit. transition equation. The successive reactivity of the OH groups of I was detd. by studying the condensation of I with II. The distribution curves of the different mol. species were plotted from gel permeation chromatog. measurements of the I-II reaction medium at various degrees of conversion and examn. of these distribution curves showed a nonequireactivity of the sites of the polyol, which was assigned to a pos. substitution effect. The substitution effect was quantified by comparing exptl. distribution curve with the result of a kinetic anal. The gelation equation showed that a pos. substitution effect on the OH groups of I decreased the extent of reaction necessary for gelation. The 7-9% difference between the exptl. gelation curve and the theor. curves with substitution effect was accounted for by intramol. reactions.

Explosive composition containing a hydroxyalkyl acrylate copolymer binder

Explosive composition containing a hydroxyalkyl acrylate copolymer binder. Goldhagen, Samuel; Heller, Harry; Rothenstein, Julius (United States Dept. of the Navy, USA). U.S. US 4050968 27 Sep 1977, 3 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C06B045-10. NCL: 149019400. APPLICATION: US 70-29623 29 Apr 1970. DOCUMENT TYPE: Patent CA Section: 50 (Propellants and Explosives) Section cross-reference(s): 37 High-energy HMX [2691-41-0] explosives for on-site casting are obtained with hydroxyalkyl acrylate copolymer binders. Copolymers of dinitropropyl acrylate and Me acrylate with 2-hydroxyethyl or 2-hydroxypropyl acrylate or methacrylate are prepd. with bis(2,2-dinitropropyl)formal [5917-61-3] plasticizer and TDI [26471-62-5] or its mixts. with trimethylol propane [77-99-6] as curing agents. Thus, an explosive is prepd. from HMX and dinitropropyl acrylate-(2-hydroxyethyl acrylate)-methyl acrylate polymer [65292-42-4].