The effect of terminal groups on the structure and properties of oligosilsesquioxanes

• Published in: Polymer science. Series B Vol. 51; no. 1-2; pp. 46 - 54
• Main Authors: Shevchenko, V. V., Gumennaya, M. A., Shevchuk, A. V., Gomza, Yu. P., Klimenko, N. S., Boichuk, V. V.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.02.2009; Pleiades
• Subjects: Applied sciences; Chemical modifications; Chemistry; Chemistry and Materials Science; Exact sciences and technology; Inorganic and organomineral polymers; Physicochemistry of polymers; Polymer Sciences; Synthesis; Polymer Science Series; Acetic Anhydride; Hyperbranched Polymer; Phthalic Anhydride; Glycidol; Substituent effect; Organic isocyanate; End group; Silsesquioxane polymer; Benzo[c]furan-1,3dione(1,3-dihydro); Organic anhydride; Experimental study; Oligomer; Acetic anhydride; Esterification; Thermal stability; Carbamoylation; Chemical modification; Supramolecular structure; Hydroxyl group; Functional group
• ISSN: 1560-0904; 1555-6123
• DOI: 10.1134/S1560090409010072

The interaction of oligomeric silsesquioxanes, whose organic moieties contain tertiary amino groups and primary and secondary hydroxyl groups, with monoisocyanates and phthalic and acetic anhydrides is employed to synthesize a number of their N -alkyl(aryl)urethane-, carboxyl- and acetyl-terminated derivatives with different degrees of substitution and combinations of the substituents. The obtained derivatives are studied by functional analysis, IR spectroscopy, GPC, DSC, TGA, and wide-angle X-ray scattering. The chemical nature of the incorporated functional groups is found to markedly influence the structure and properties of the synthesized compounds. Depending on the type of substituents and their combination, either the complete amorphization or ordering of the structure of the oligosilsesquioxanes is observed with corresponding changes in their properties.