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Shchegolikhina O.I.,RAS Nesmeyanov Institute of Organoelement Compounds | Matukhina E.V.,Moscow State Pedagogical University | Anisimov A.A.,RAS Nesmeyanov Institute of Organoelement Compounds | Molodtsova Y.A.,RAS Nesmeyanov Institute of Organoelement Compounds | And 3 more authors.
Macroheterocycles | Year: 2016

The samples of tris-cis-tris-trans-dodecaphenylcyclododecasiloxanedodecaol (dodecaol) with different crystalline structure have been investigated by means of TGA and X-ray methods. The samples obtained have exhibited mesomor phic properties, the thermal behavior and the type of mesomorphic ordering being directly associated with the type of the main H-bonded unit forming the initial crystalline structure. In turn, the type of an ordering in the mesophase has determined the structure of the final products of polycondensation. It was shown that the multifunctional tris-cis-tristrans- dodecaphenylcyclododecasiloxanedodecaol can be used as possible monomer precursor for the covalent-bonded “double-chain sheet polymer”. © ISUCT Publishing. Source


Lesnyakova L.V.,Ns Enikolopov Institute Of Synthetic Polymeric Materials | Chernyshenko A.O.,Ns Enikolopov Institute Of Synthetic Polymeric Materials | Akopova T.A.,Ns Enikolopov Institute Of Synthetic Polymeric Materials | Vladimirov L.V.,Ns Enikolopov Institute Of Synthetic Polymeric Materials | And 3 more authors.
International Polymer Science and Technology | Year: 2013

By exposure to shear strains in solid phase, polyvinyl alcohol was obtained from polyvinyl acetate. The reaction mixture of solid NaOH and polyvinyl acetate was subjected to the combined action of pressure and shear strains in an extruder. The obtained products were characterised by their composition, solubility, molecular weight, and thermal properties. The influence of the amount of NaOH introduced and the use of a less alkaline reagent on the composition of the obtained products was investigated. © 2013 Smithers Rapra Technology. Source

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