Reference

Alkoxysilane double cluster compounds with silicone bridges

Alkoxysilane double cluster compounds with silicone bridges. Knollmueller, Karl O. (Olin Corp., USA). U.S. US 4058546 15 Nov 1977, 8 pp. (English). (United States of America). CODEN: USXXAM. CLASS: IC: C07F007-04. NCL: 260448800R. APPLICATION: US 77-791671 28 Apr 1977. DOCUMENT TYPE: Patent CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) Section cross-reference(s): 29 The title compds. of the general formula [(RO)3SiO]2SiR1(OSiR2R3)nOSiR1[OSi(OR)3]2 [I; R = alkyl, alkenyl, aryl, and aralkyl; R1 = H, alkyl, alkenyl, aryl, aralkyl, or OSi(OR)3; R2 and R3 = H, alkyl, alkenyl, aryl, aralkyl, and halo- or cyano-substituted alkyl, alkenyl, aryl, and aralkyl; n = 1-301] are useful as hydraulic fluids and heat-transfer fluids and are prepd. by reacting an alkoxysilanol cluster compd. [e.g., [(sec-BuO)3SiO]2SiMeOH (II) [60711-46-8]] with a dihalo Si bridging compd. [e.g., SiMe2Cl2 (III) [75-78-5]] in the presence of a base as H halide acceptor. Thus, a mixt. of 154.9 g I, 29.2 g pyridine, and 400 mL heptane was stirred at -5° under N, and a soln. of 17.06 g II in 80 mL heptane was added dropwise. The product was heated 12 h at 70°, cooled, water washed, dried, and fractionated. The desired product [I (R = sec-Bu, R1 = R2 = R3 = Me, n = 1) [65618-20-4]] b. 255 ± 3°/0.05 mm was obtained in 59.5% yield, and its usefulness as a functional fluid was shown by tests for viscosity, flash point, wt. loss, 4-ball wear scar, and hydrolytic stability.

Interfacial free energies of binary mixtures of homopolymers on poly(tetrafluoroethylene) and on silanized glass

Interfacial free energies of binary mixtures of homopolymers on poly(tetrafluoroethylene) and on silanized glass. Calderon, H. S.; St.-Pierre, L. E. (Dep. Chem., McGill Univ., Montreal, Que., Can.). J. Colloid Interface Sci., 63(3), 399-409 (English) 1978. CODEN: JCISA5. ISSN: 0021-9797. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) Section cross-reference(s): 66 The solid/liq. interfacial surface tensions on PTFE [9002-84-0] and on glass treated with Me2SiCl2 [75-78-5] were calcd. from the adhesion tensions which were measured as a function of compn. for 3 binary mixts. of polyethers, a polyether-H2O soln., and a polydimethylsiloxane-Tetralin [119-64-2] soln., and the results were in good agreement with those calcd. using the Prigogine theory. Replacement of the gas phase by a low-energy solid did not result in any substantial reorganization of the polar mixts. at the interface.