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| Titel: |
Block-copolymers with Polyphenyl-α-Naphtylsilane Fragments in Dimethylsiloxane Chain |
| Auteur: |
Mukbaniani, O. Scherf, U. Karchkhadze, M. G. Tatrishvili, T. Khananashvili, L. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 48 (2001) nr. 3 pagina's 311-330 |
| Jaar: |
2001 |
| Inhoud: |
The Wurtz-type reductive-coupling reaction of dichlorophenyl-α-naphtylsilanes was carried out both in the presence of metalic sodium in toluene solution and in a mixture of toluene and o-xylene (at 1:1 ratio) in the presence of sodium and catalytic amount of mercury. Oligomers of α,ω-dichlorophenyl-α-naphtylsilane with various degrees of polymerization were obtained. By hydrolysis of α,ω-dichlorophenyl-α-naphtylsilane the corresponding α,ω-dihydroxydiorganosilanes has been obtained. The heterofunctional condensation of α,ω-dichloro(dihydroxy)phenyl-α-naphtylsilanes with α,ω-dihydroxy(dichloro)dimethylsiloxanes in the presence of acceptor pyridine has been carried out and polysilane-siloxane block-copolymers were obtained. Depending on the lengths of the rigid and flexible initial oligomers microdomain structure of block-copolymers were observed. The synthesized block-copolymers were characterized by gel permeation chromatography, differential scanning calorimetry and X-ray methods. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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