The explicit diisocyanate used and the particular triorganosilyl diamine employed can be diversified broadly as lots of the examples which have been given above indicate. Compounds of the overall Formula VII have makes use of in making the polysilylureas of Formula IV and in the end polyureas of Formula V. in addition, they can be used to make polyimides of the kind disclosed in Boldebuck et al. utility Serial Number 359,928, filed concurrently herewith and assigned to the identical assignee as the present utility. Found, Theoretical, percent p.c 6 manufactured by Du Pont).
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Suitable solvent-resistant hose and flexible tubing may be prepared by extrusion strategies. The following examples are illustrative of the invention and are not intended to be limiting. All components are by weight except otherwise said. Where analyses are proven, the values in parentheses are the theoretical values.
The options additionally may be used to spin fibers of the polysilylurea through spinnerettes and volatilizing the solvent. Polysilylureas of Formula IV have molecular weights starting from a thousand to 500,000 or extra. Depending on the substituents which R, R and Z, and m represent, many of such polymers will have softening factors of round C.
- By using the diamine because the hydrolyzing agent, it’s converted directly into a disilyl diamine which might then be used to make further polysilylureas by response with the appropriate diisocyanate.
- With respect to Z alone, when it’s part of a cyclic radical containing the 2 nitrogen atoms, Z can be, as an example, the divalent ethylene radical, each the methylene radical and the upper alkylene radicals, such because the pentamethylene radical when the 2 nitrogens are closer together within the ring, and so forth.
- Films and fibers had been useful as electrical insulation and for high temperature cloths, respectively, could possibly be forged or spun from solutions of this polyurea in dimethyl formamide.
- In addition, when Z with the two nitrogens in a cyclic natural radical containing the nitrogen in the ring construction such groupings may be, for instance, the piperazyl radical of the formula the place R is a monovalent hydrocarbon radical corresponding to these recited for R , and p is an entire number from to 4, inclusive.
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With respect to Z alone, when it’s part of a cyclic radical containing the 2 nitrogen atoms, Z may be, as an example, the divalent ethylene radical, each the methylene radical and the higher alkylene radicals, such because the pentamethylene radical when the two nitrogens are nearer together in the ring, and so forth. Furthermore, it ought to be acknowledged that m is 1 solely when the grouping of Formula III is acyclic, whereas in is 0, only when the latter grouping is cyclic in nature. Where R is an arylene radical, any substituents thereon can be in any of the positions vicinal, symmetrical and asymmetrical to the valences of the arylene radical connected to the isocyanate radicals. The valences of the arylene group could also be varied in ortho-, meta-, or para-positions with the metaor para-positions 7 being the popular association.
In order to kind the polysilylurea, the diisocyanate is then reacted with the triorganosilylamine of Formula II using a molar ratio of about 1 mol of the triorganosilylamine per mol of the diisocyanate. There is thus obtained an answer of the desired polysilylurea which can be precipitated from the solvent by the addition of a non-solvent for the polysilylurea, such as n-hexane.
(Cl. ) This invention is concerned with polysilylureas, their preparation, their conversion to polyureas, and intermediates used to make these polysilylureas. More notably the invention relates to a course of for making polysilylureas which includes effecting reaction between a diisocyanate of the formulation OCNRNCO with a triorganosilylamine of the formula R3 S iN Z-N S iR Rllm R!!! where R is a divalent natural radical, R is a monovalent hydrocarbon radical, R is a member selected from the category consisting of hydrogen and monovalent hydrocarbon radicals, and the grouping lTIZ-1TT- (R /I)m (RI/)m is a divalent organic radical selected from the category consisting of natural radicals terminated by two nitrogen atoms with Z being a divalent organic moiety, and alicyclic radicals during which Z with the two nitrogens varieties a cyclic diamine structure, and m is an entire number from 0 to 1, in being zero solely when the aforesaid grouping is alicyclic. The invention also includes polysilylureas of the method (IV o o e m tr 81B; R »,,, R »m SiRa x the place R, R, R », Z and m have the meanings above and x is an entire quantity in extra of l, as an example from to 10,000 or more and as high as a hundred,000 or higher; and the conversion of these polysilylureas to polyureas of the method IiI R »m R » m H the place again R, R », Z, In and x have the meanings given above, the stated polyureas being fashioned by the hydrolysis of the polysilylurea to remove the -SiR groups to type the polyureas and disiloxanes of the formulation R’ OSiR’ the place R has the which means given above.
In maleing the triorganosilyl amines of Formula II, a molar ratio of a minimum of 2 and up to 6 or extra mols of the trihydrocarbon substituted hydrolyzable silane of. The triorganohydrolyzable silane, such as, trimethylchlorosilane, is added to the diamino compound, within the presence of a hydrohalide acceptor similar to, pyridine, triethylamine, etc. or another tertiary amine usually ends in an exothermic reaction with the temperature rising as high as 4070 C. The combination of components is advantageously stirred for a period of from about one half to 2 hours and thereafter heated on the reflux temperature of the mass for an extra interval of 15 minutes to 1 hour and the hydrohalide of the hydrohalide acceptor is then filtered off and the reaction product thereafter fractionally distilled to acquire the specified triorganosilyl amine of Formula II.
This polymer when dried beneath vacuum beneath anhydrous circumstances, was a polysilylurea composed of recurring models of the method. The formation of the polyurea containing fewer silyl teams than the beginning polysilylurea, or a polyurea fully free of silyl teams, may be completed by exposing the polysilylurea to air, preferably of from 70 to relative humidity. This effects hydrolysis of the triorganosilyl groups to form the corresponding disiloxane with the substitution of a hydrogen atom in place of the triorganosilyl group on a nitrogen atom. Where the polysilylurea is fairly thick in cross-section, the scission of the triorganosilyl teams by hydrolysis is more rapid on the floor than in the matrix of the polysilylurea article.
Washing the solutions of the polys’ilylurea with Water will elTect primarily complete elimination of the triorganosilyl groups. After hydrolysis with the moisture or water-containing surroundings, the disiloxane is removed from the polyurea by washing with suitable solvents or by heating at temperatures high enough to volatilize the disiloxane.
The triorganosilyl diamines of Formula II may be ready by reacting a diamine of Formula VIII with a triorganohydrolyzable silane of the method where R, R, Z, and 111 have the meanings given above, and X is a halogen, for instance, chlorine, bromine, fluorine, and so forth. Among the triorganohydrolyzable silanes which may be employed are, as an example, trimethylchlorosilane, triphenylchlorosilane, methyldiethylbromosilane, tritolylbromosilane, triethylchlorosilane, tribenzylchlorosilane, and so on. By entering this site you swear that you are of authorized age in your space to view adult materials and that you just wish to view such materials.All porn movies and images are property and copyright of their house owners.All models appearing on this website were 18 years or older on the time the movies has been produced. XVideos.com – the best free porn movies on internet, 100% free. A composition of matter having the formula Where R is a monovalent hydrocarbon radical and Q is a divalent aryl radical selected from the category consisting of phenylene, xenyl, diphenylene oxide, and diphenylene alkanes of the method Where R’ is a divalent alkyl radical.