Ladder Polyphenylsiloxanes with Single and Double Stranded Fragments in the Chain
Titel:
Ladder Polyphenylsiloxanes with Single and Double Stranded Fragments in the Chain
Auteur:
Mukbaniani, Omari V. Achelashvili, Valeri A. Karchkhadze, Marina G. Tkeshelashvili, Rusudan Sh. Levin, Viktor Yu. Khananashvili, Lotari M.
Verschenen in:
International journal of polymeric materials
Paginering:
Jaargang 18 (1992) nr. 3-4 pagina's 129-141
Jaar:
1992-11-01
Inhoud:
The reaction of heterofunctional polycondensation (HFC) of ladder polyphenylsiloxanes with hydroxyl groups at the ends with α, ω-dichlorodimethylsiloxanes in a solution in the presence of an acceptor, HCl-pyridine, and with α, ω-bis(dimethylamino)dimethylsiloxanes in a melt in a mole ratio 1:1 and 1:2 of the starting components, respectively, has been studied. Block copolymers completely soluble in organic solvents are synthesized. Thermogravimetric, thermomechanical and X-ray analyses of polymers obtained werre carried out. The thermomechanical and X-ray analyses have made it possible to establish that at certain lengths of the phenylsiloxane and dimethylsiloxane links phase separation is observed, which points to block copolymer formation.