摘要:
Living anionic polymers of unsaturated monomers are conveniently capped with oxetane or an alkyl substituted oxetane to provide terminal primary hydroxyl groups. The hydroxyl capped polymers are useful in making coatings, sealants, binders, and block copolymers with polyesters, polyamides, and polycarbonates.
摘要:
A method of oxidizing the surface of carbon microfibers that includes contacting the microfibers with an oxidizing agent that includes sulfuric acid and potassium chlorate under reaction conditions sufficient to oxidize the surface. The invention also features a method of decreasing the length of carbon microfibers that includes contacting the microfibers with an oxidizing agent under reaction conditions sufficient to decrease the length.
摘要:
A method of oxidizing the surface of carbon microfibers that includes contacting the microfibers with an oxidizing agent that includes sulfuric acid and potassium chlorate under reaction conditions sufficient to oxidize the surface. The invention also features a method of decreasing the length of carbon microfibers that includes contacting the microfibers with an oxidizing agent under reaction conditions sufficient to decrease the length.
摘要:
The capping of anionic polymers to make functionalized polymers is used to make heterotelechelic polymers by using a protected functional initiator to polymerize a polymer comprising a conjugated diene and then capping the polymer with low surface energy fluorocarbons. The protected functional groups are stable under a variety of conditions and then readily convert to more reactive terminal functional groups useful for making sealants, coatings, molded or extruded goods and fibers having low surface energy.
摘要:
A process for making polymers of conjugated dienes which contain hydroxyl groups in the diene blocks which comprises(a) making a precursor polymer by polymerizing at least one conjugated diene which leaves 1,2 disubstituted, 1,1 disubstituted, 1,1,2 trisubstituted or tetrasubstituted olefinic unsaturation in the polymer,(b) optionally partially hydrogenating said precursor polymer,(c) epoxidizing said precursor polymer such that epoxy groups form at said substituted sites and the amount of epoxy functionality in the polymer is from 0.1 to 5 Meq/g polymer, and(d) reacting the epoxidized polymer with an alcohol solution of hydrochloric acid.A diene polymer containing 0.1 to 10 Meq/g polymer of hydroxyl group and comprised of alcohol units of the formula ##STR1## where R.sub.1 and R.sub.2 are hydrogen or alkyl radicals and X and X' are either --OH or --Cl and at least one of them is --OH.
摘要:
A method of oxidizing the surface of carbon microfibers that includes contacting the microfibers with an oxidizing agent that includes sulfuric acid and potassiaum chlorate under reaction conditions sufficient to oxidize the surface. The invention also features a method of decreasing the length of carbon microfibers that includes contacting the microfibers with an oxidizing agent under reaction conditions sufficient to decrease the length.
摘要:
The capping of anionic polymers to make functionalized polymers is improved by using alkoxy silyl compounds having protected functional groups, such as acetal groups, as the capping agent. The protected functional groups are stable under a variety of conditions and then readily convert to more reactive terminal functional groups useful for making adhesives, sealants and coatings.
摘要:
A process for making polymers of conjugated dienes which contain hydroxyl groups in the diene blocks which comprises(a) making a precursor polymer by polymerizing at least one conjugated diene which leaves 1,2 disubstituted, 1,1 disubstituted, 1,1,2 trisubstituted or tetrasubstituted olefinic unsaturation in the polymer,(b) optionally partially hydrogenating said precursor polymer,(c) epoxidizing said precursor polymer such that epoxy groups form at said substituted sites and the amount of epoxy functionality in the polymer is from 0.1 to 5 Meq/g polymer, and(d) reacting the epoxidized polymer with an alcohol solution of hydrochloric acid.A diene polymer containing 0.1 to 10 Meq/g polymer of hydroxyl group and comprised of alcohol units of the formula ##STR1## where R.sub.1 and R.sub.2 are hydrogen or alkyl radicals and X and X' are either --OH or --Cl and at least one of them is --OH.
摘要:
The present invention is a, solid block copolymer comprising at least two polymer end blocks A and at least one polymer interior block B wherein each A block is a polymer block resistant to lithiation and each B block is a polymer block susceptible to lithiation, and wherein said A and B blocks do not contain any significant levels of olefinic unsaturation. After lithiation, the lithiated polymer is reacted with at least one graftable functional molecule selected from the group consisting of an electrophilic graftable molecule containing a functional group and an electrophile. Preferred are carbon monoxide and ethylene oxide. Also claimed are processes for making such block copolymers, and the various end uses and applications for such block copolymers.
摘要:
The present invention is a, solid block copolymer comprising at least two polymer end blocks A and at least one polymer interior block B wherein each A block is a polymer block resistant to lithiation and each B block is a polymer block susceptible to lithiation, and wherein said A and B blocks do not contain any significant levels of olefinic unsaturation. Preferably, each A block comprising one or more segments selected from polymerized (i) para-substituted styrene monomers not having hydrogen on a para benzylic carbon center, (ii) ethylene, (iii) alpha olefins of 3 to 18 carbon atoms; (iv) hydrogenated 1,3-cyclodiene monomers, (v) hydrogenated monomers of conjugated dienes having a vinyl content less than 35 mol percent prior to hydrogenation, (vi) acrylic esters, (vii) methacrylic esters, and (viii) mixtures thereof; and each B block comprising segments of one or more polymerized vinyl aromatic monomers selected from (i) unsubstituted styrene monomers, (ii) ortho-substituted styrene monomers, (iii) meta-substituted styrene monomers, (iv) alpha-methylstyrene, (v) para-substituted styrene having hydrogen on a para benzylic carbon center (vi) 1,1-diphenylethylene, (vii) 1,2-diphenylethylene and (viii) mixtures thereof. After lithiation, the lithiated polymer is reacted with at least one graftable functional molecule selected from the group consisting of an electrophilic graftable molecule containing a functional group and an electrophile. Preferred are carbon monoxide and ethylene oxide. Also claimed are processes for making such block copolymers, and the various end uses and applications for such block copolymers.