13 research outputs found
Π‘ΠΠΠ’ΠΠ ΠΠΠΠΠΠ‘ΠΠΠΠ ΠΠΠ©ΠΠ₯ ΠΠΠΠΠΠΠΠΠΠ’ΠΠΠ‘ΠΠΠΠΠ‘ΠΠΠΠ
The process of co-condensation of 3-aminopropylmethyldimethoxysilane with Ξ±,Ο-dihydroxyoligo-dimethylsiloxanes is studied. It is shown that the method proposed allows obtaining aminosiloxanes with a definite structure in quantitative yield. The methoxy group in aminopropylmethoxysiloxane oligomers can be quantitatively replaced by trimethylsiloxy group by transesterification with trimethylsilanol, leading to aminosiloxanes with the same chain length. The hydrolysis of the methoxy groups in aminopropylmethoxysiloxane oligomers causes the increase of the polymer chain length due to partial co-condensation of silanol groups leading to aminosiloxanes with a strictly alternating dimethylsiloxane block of the fixed length and a pair of aminopropylmethylsiloxane units. The reaction of N,Nβ-bis(trimethylsilyl)carbodiimide or hexamethyldisilazane with residual silanol groups leads to trimethylsiloxy-substituted polyaminopolysiloxanes. The trimethylsililation of the residual silanol groups with hexamethyldisilazane is accompanied by the trimethylsililation of the amino groups.ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ ΠΏΡΠΎΡΠ΅ΡΡΡ ΡΠΎΠΊΠΎΠ½Π΄Π΅Π½ΡΠ°ΡΠΈΠΈ 3-Π°ΠΌΠΈΠ½ΠΎΠΏΡΠΎΠΏΠΈΠ»ΠΌΠ΅ΡΠΈΠ»Π΄ΠΈΠΌΠ΅ΡΠΎΠΊΡΠΈΡΠΈΠ»Π°Π½Π° Ρ Ξ±,Ο-Π΄ΠΈΠ³ΠΈΠ΄ΡΠΎΠΊΡΠΈ-ΠΎΠ»ΠΈΠ³ΠΎΠ΄ΠΈΠΌΠ΅ΡΠΈΠ»ΡΠΈΠ»ΠΎΠΊΡΠ°Π½Π°ΠΌΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠΉ Π΄Π»ΠΈΠ½Ρ, Π° ΡΠ°ΠΊΠΆΠ΅ Π·Π°ΠΌΠ΅ΡΠ΅Π½ΠΈΡ Π² ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΡ
ΠΏΡΠΎΠ΄ΡΠΊΡΠ°Ρ
ΠΌΠ΅ΡΠΎΠΊΡΠΈΠ³ΡΡΠΏΠΏΡ Π½Π° ΡΡΠΈΠΌΠ΅ΡΠΈΠ»ΡΠΈΠ»ΠΎΠΊΡΠΈΠ³ΡΡΠΏΠΏΡ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ΠΌ Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠΌΠΈ ΡΠΈΠ»ΠΈΠ»ΠΈΡΡΡΡΠΈΠΌΠΈ Π°Π³Π΅Π½ΡΠ°ΠΌΠΈ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π΄Π°Π½Π½ΡΠΉ ΡΠΏΠΎΡΠΎΠ± ΡΠΈΠ½ΡΠ΅Π·Π° ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΠΏΠΎΠ»ΡΡΠ°ΡΡ Π°ΠΌΠΈΠ½ΠΎΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΠ΅ ΡΠΈΠ»ΠΎΠΊΡΠ°Π½Ρ Π·Π°Π΄Π°Π½Π½ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° ΠΈ ΡΡΡΠΎΠ΅Π½ΠΈΡ Ρ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π΅Π½Π½ΡΠΌ Π²ΡΡ
ΠΎΠ΄ΠΎΠΌ
Π€Π£ΠΠΠ¦ΠΠΠΠΠΠ¬ΠΠ«Π ΠΠ ΠΠΠΠΠΠΠ ΠΠΠΠΠ§ΠΠ‘ΠΠΠ ΠΠΠ©ΠΠ‘Π’ΠΠ - Π‘Π’ΠΠΠΠΠΠΠΠ’ΠΠ Π« ΠΠΠΠΠΠΠ ΠΠ«Π₯ Π‘Π£Π‘ΠΠΠΠΠΠ
The review presents schemes for obtaining homologous series of the linear Ξ±,Ο-carbofunctional oligodimethylsiloxanes with the silicone chain length from 6 to 60 siloxane units containing carboxydecyl, aminopropyl and glycidoxypropyl groups at the chain ends allowing to obtain organosilicon surfactants with reproducible structure and properties. Data on the surfactant colloidchemical properties and kinetic regularities of styrene polymerization in their presence are provided. Systematic research of heterophase styrene polymerization kinetic regularities in the presence of water-insoluble Ξ±,Ο-carbofunctional oligodimethylsiloxane allowed to formulate the fundamental differences of polymerization kinetic regularities from those observed in the presence of water-soluble surfactants. The mechanism of interfacial adsorption layers formation with water-insoluble Ξ±,Ο-carbofunctional oligodimethylsiloxanes on the surface of monomer drops and polymer-monomeric particles was considered. This mechanism consists in the forced surfactant replacement by the formed polymer (because of their incompatibility) to the interfacial adsorption layer and in the formation of the surfactant supermolecular structures. The latter in total with the polymer provide its high durability.Π ΠΎΠ±Π·ΠΎΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΡ
Π΅ΠΌΡ ΡΠΈΠ½ΡΠ΅Π·Π° Π³ΠΎΠΌΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΡΠ΄Π° Π»ΠΈΠ½Π΅ΠΉΠ½ΡΡ
Ξ±,Ο-ΠΊΠ°ΡΠ±ΠΎΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΡ
ΠΎΠ»ΠΈΠ³ΠΎΠ΄ΠΈΠΌΠ΅ΡΠΈΠ»ΡΠΈΠ»ΠΎΠΊΡΠ°Π½ΠΎΠ² Ρ Π΄Π»ΠΈΠ½ΠΎΠΉ ΡΠ΅ΠΏΠΈ ΠΎΡ 6 Π΄ΠΎ 60 ΡΠΈΠ»ΠΎΠΊΡΠ°Π½ΠΎΠ²ΡΡ
Π·Π²Π΅Π½ΡΠ΅Π², ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΡ
ΠΊΠ°ΡΠ±ΠΎΠΊΡΠΈΠ΄Π΅ΡΠΈΠ»ΡΠ½ΡΠ΅, Π°ΠΌΠΈΠ½ΠΎΠΏΡΠΎΠΏΠΈΠ»ΡΠ½ΡΠ΅ ΠΈ Π³Π»ΠΈΡΠΈΠ΄ΠΎΠΊΡΠΈΠΏΡΠΎΠΏΠΈΠ»ΡΠ½ΡΠ΅ Π³ΡΡΠΏΠΏΡ Π½Π° ΠΊΠΎΠ½ΡΠ°Ρ
ΡΠ΅ΠΏΠ΅ΠΉ, ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡΠΈΠ΅ ΠΏΠΎΠ»ΡΡΠ°ΡΡ ΠΊΡΠ΅ΠΌΠ½ΠΈΠΉΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ½ΠΎ-Π°ΠΊΡΠΈΠ²Π½ΡΠ΅ Π²Π΅ΡΠ΅ΡΡΠ²Π° Ρ Π²ΠΎΡΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΠΈΠΌΡΠΌΠΈ ΡΡΡΡΠΊΡΡΡΠΎΠΉ ΠΈ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌΠΈ. ΠΡΠΈΠ²Π΅Π΄Π΅Π½Ρ Π΄Π°Π½Π½ΡΠ΅ ΠΏΠΎ ΠΊΠΎΠ»Π»ΠΎΠΈΠ΄Π½ΠΎ-Ρ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΠΌ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌ ΠΠΠ ΠΈ ΠΊΠΈΠ½Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΠΌ Π·Π°ΠΊΠΎΠ½ΠΎΠΌΠ΅ΡΠ½ΠΎΡΡΡΠΌ ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠΈΠ·Π°ΡΠΈΠΈ ΡΡΠΈΡΠΎΠ»Π° Π² ΠΈΡ
ΠΏΡΠΈΡΡΡΡΡΠ²ΠΈΠΈ. Π‘ΡΠΎΡΠΌΡΠ»ΠΈΡΠΎΠ²Π°Π½Ρ ΠΏΡΠΈΡΠΈΠ½Ρ ΠΏΡΠΈΠ½ΡΠΈΠΏΠΈΠ°Π»ΡΠ½ΡΡ
ΠΎΡΠ»ΠΈΡΠΈΠΉ ΠΊΠΈΠ½Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π·Π°ΠΊΠΎΠ½ΠΎΠΌΠ΅ΡΠ½ΠΎΡΡΠ΅ΠΉ ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠΈΠ·Π°ΡΠΈΠΈ ΡΡΠΈΡΠΎΠ»Π° Π² ΠΏΡΠΈΡΡΡΡΡΠ²ΠΈΠΈ ΠΊΡΠ΅ΠΌΠ½ΠΈΠΉΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΡ
ΠΠΠ ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ Π·Π°ΠΊΠΎΠ½ΠΎΠΌΠ΅ΡΠ½ΠΎΡΡΡΠΌΠΈ, Π½Π°Π±Π»ΡΠ΄Π°Π΅ΠΌΡΠΌΠΈ ΠΏΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠΈ Π²ΠΎΠ΄ΠΎΡΠ°ΡΡΠ²ΠΎΡΠΈΠΌΡΡ
ΠΠΠ
SYNTHESIS OF AMINO-CONTAINING OLIGODIMETHYLSILOXANES
The process of co-condensation of 3-aminopropylmethyldimethoxysilane with Ξ±,Ο-dihydroxyoligo-dimethylsiloxanes is studied. It is shown that the method proposed allows obtaining aminosiloxanes with a definite structure in quantitative yield. The methoxy group in aminopropylmethoxysiloxane oligomers can be quantitatively replaced by trimethylsiloxy group by transesterification with trimethylsilanol, leading to aminosiloxanes with the same chain length. The hydrolysis of the methoxy groups in aminopropylmethoxysiloxane oligomers causes the increase of the polymer chain length due to partial co-condensation of silanol groups leading to aminosiloxanes with a strictly alternating dimethylsiloxane block of the fixed length and a pair of aminopropylmethylsiloxane units. The reaction of N,Nβ-bis(trimethylsilyl)carbodiimide or hexamethyldisilazane with residual silanol groups leads to trimethylsiloxy-substituted polyaminopolysiloxanes. The trimethylsililation of the residual silanol groups with hexamethyldisilazane is accompanied by the trimethylsililation of the amino groups
FUNCTIONAL ORGANOSILICON SUBSTANCES AS STABILIZERS OF POLYMERIC SUSPENSIONS
The review presents schemes for obtaining homologous series of the linear Ξ±,Ο-carbofunctional oligodimethylsiloxanes with the silicone chain length from 6 to 60 siloxane units containing carboxydecyl, aminopropyl and glycidoxypropyl groups at the chain ends allowing to obtain organosilicon surfactants with reproducible structure and properties. Data on the surfactant colloidchemical properties and kinetic regularities of styrene polymerization in their presence are provided. Systematic research of heterophase styrene polymerization kinetic regularities in the presence of water-insoluble Ξ±,Ο-carbofunctional oligodimethylsiloxane allowed to formulate the fundamental differences of polymerization kinetic regularities from those observed in the presence of water-soluble surfactants. The mechanism of interfacial adsorption layers formation with water-insoluble Ξ±,Ο-carbofunctional oligodimethylsiloxanes on the surface of monomer drops and polymer-monomeric particles was considered. This mechanism consists in the forced surfactant replacement by the formed polymer (because of their incompatibility) to the interfacial adsorption layer and in the formation of the surfactant supermolecular structures. The latter in total with the polymer provide its high durability