Изучение реологических параметров межфазных адсорбционных слоев оксиэтилированных нерастворимых в воде ПАВ

The article presents the results of a study on the behavior of water-insoluble ethoxylated surfactants of different nature on the phase boundary by the method of oscillating drops and by the method of Langmuir-Blodgett films. It was shown that the water-insoluble ethoxylated surfactants form supramolecular structures and stable layers at the water/air interface.В работе представлены результаты изучения поведения оксиэтилированных нерастворимых в воде ПАВ различной природы на границе раздела фаз методом осциллирующей капли и методом Ленгмюра. Показано, что оксиэтилированные нерастворимые в воде ПАВ образуют надмолекулярные структуры и формируют на границе раздела вода/воздух стабильные слои

ФУНКЦИОНАЛЬНЫЕ КРЕМНИЙОРГАНИЧЕСКИЕ ВЕЩЕСТВА - СТАБИЛИЗАТОРЫ ПОЛИМЕРНЫХ СУСПЕНЗИЙ

The review presents schemes for obtaining homologous series of the linear α,ω-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 α,ω-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 α,ω-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.В обзоре представлены схемы синтеза гомологического ряда линейных α,ω-карбофункциональных олигодиметилсилоксанов с длиной цепи от 6 до 60 силоксановых звеньев, содержащих карбоксидецильные, аминопропильные и глицидоксипропильные группы на концах цепей, позволяющие получать кремнийорганические поверхностно-активные вещества с воспроизводимыми структурой и свойствами. Приведены данные по коллоидно-химическим свойствам ПАВ и кинетическим закономерностям полимеризации стирола в их присутствии. Сформулированы причины принципиальных отличий кинетических закономерностей полимеризации стирола в присутствии кремнийорганических функциональных ПАВ по сравнению с закономерностями, наблюдаемыми при использовании водорастворимых ПАВ

Study on rheological parameters of interfacial adsorption layers of ethoxylated water-insoluble surfactants

The article presents the results of a study on the behavior of water-insoluble ethoxylated surfactants of different nature on the phase boundary by the method of oscillating drops and by the method of Langmuir-Blodgett films. It was shown that the water-insoluble ethoxylated surfactants form supramolecular structures and stable layers at the water/air interface

FUNCTIONAL ORGANOSILICON SUBSTANCES AS STABILIZERS OF POLYMERIC SUSPENSIONS

The review presents schemes for obtaining homologous series of the linear α,ω-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 α,ω-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 α,ω-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

The synthesis of high dispersed polstyrene suspensions with narrow particle distribution by sizes

Polysterene suspensions with particle diameters of 0.05-0.2 microns and narrow distribution by sizes can be synthesized at polymerization of styrene in high-disperse emulsions at high temperature and low concentration of monomer in the presence of ionic surfactant. Monodisperse polymeric suspensions with a diameter of particles 0.2 microns were prepared only in the presence of water-soluble inhibitor

Синтез высокодисперсных полистирольных суспензий с узким распределением частиц по размерам

Polysterene suspensions with particle diameters of 0.05-0.2 microns and narrow distribution by sizes can be synthesized at polymerization of styrene in high-disperse emulsions at high temperature and low concentration of monomer in the presence of ionic surfactant. Monodisperse polymeric suspensions with a diameter of particles 0.2 microns were prepared only in the presence of water-soluble inhibitor.Сформулированы пути синтеза полистирольных суспензий с узким распределением частиц по размерам и диаметрами в интервале 0.05-0.2 мкм. Показано, что монодисперсные полимерные суспензии с диаметром частиц 0.2 мкм могут быть получены только в присутствии водорастворимого ингибитора