Organosiloxane copolymers

Anionic copolymerization of e-caprolactam and cj-caprylolactam was also reported212,213. Organosiloxane copolymers can be prepared from two different cyclics by using acid or base catalysts214. ... 

In summary, it has been possible to prepare a variety of organosiloxane copolymers which demonstrate useful mechanical properties but also provide a variety of other interesting properties... 

Mukbaniani O.V., Organosiloxane Copolymers and Block-copolymers With Different Cyclic Structure of Macromolecules, Doctor s Dissertation on Chemistry, 1993, Tbilisi State University, Tbilisi, Georgia. (Rus)... 

Organosiloxane Copolymers with Heterocyclic Fragments in the Dimethylsiloxane Backbone... 

The above-mentioned materials indicate that cyclolinear organosiloxane copolymers are usually synthesized by homopolycondensation and HFC reactions of difunctional organocyclosiloxanes or organopoly(cyclosiloxanes) with a,to-dihydroxy (diamino, dichloro)diorganosiloxanes. As known from the literature, polymerization and copolymerization of organopoly(cyclosiloxanes) not always give soluble polymers and their yield is usually low [99-103],... 

The catalysed reaction of the dehydrocondensation of a,co-bis(trimethylsiloxy) ethylhydridsiloxanes with hydroxyorganocyclosiloxanes in the presence of an alkaline metal catalyst has been investigated and organosiloxane copolymers with various amounts of cyclic fragments in the side chain has been obtained. Dehydrocondensation reaction order, rate constants and activation energy were measured. 

The main reason for the investigation was to create convenient methods for the synthesis of organosiloxane copolymers with monocyclosiloxane fragments in the side chain. To establish the influence of the cyclic fragment on the properties of copolymers the initial difunctional organodichlorosiloxyorganocyclosiloxanes and a new class of cyclolinear copolymers, with monocyclic fragments in the side chain were synthesised. 

Synthesis of Organosiloxane Copolymers with Monocyclic Fragments in the Side Chain... 

Poojari Y, Palsule AS, Cai M, Clarson SJ, Gross RA. Synthesis of organosiloxane copolymers using enzymatic polyesterification. Eur Polym J2008 44 4139 5. 

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