Poly(ethylene glycol)-Octafunctionalized Polyhedral Oligomeric Silsesquioxane:  Synthesis and Thermal Analysis

• Published in: Macromolecules Vol. 40; no. 8; pp. 2694 - 2701
• Main Authors: Markovic, Elda, Ginic-Markovic, Milena, Clarke, Stephen, Matisons, Janis, Hussain, Manwar, Simon, George P
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 17.04.2007
• Subjects: Applied sciences; Exact sciences and technology; Inorganic and organomineral polymers; Physicochemistry of polymers; Preparation; Tridimensional copolymer; Silsesquioxane polymer; Molecular structure; Hydrosilylation; Silsesquioxane copolymer; Ethylene oxide copolymer; Experimental study; Thermal stability; Chemical coupling; Star copolymer; Ethylene oxide polymer; Preparation; Block copolymer
• ISSN: 0024-9297; 1520-5835
• DOI: 10.1021/ma062327b

A homologous series of PEG (various chain length)-substituted octasilsesquioxanes were prepared by the hydrosilylation of unsaturated PEGs (poly(ethylene glycol)s) with both octa(dimethylsiloxy)silsesquioxane (Q8M8 H) and octahydridosilsesquioxane (T8 H). The silsesquioxane-PEGs materials were produced by the initial synthesis of a series of allyl-modified poly(ethylene glycol)s and subsequent attachment to both (Q8M8 H) and (T8 H). The products were chemically characterized by Fourier transform infrared (FTIR) and nuclear magnetic resonance (1H, 13C, and 29Si NMR) spectroscopy, and the properties of the allyl PEGs and their POSS hybrids were thermally characterized by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The attachment of the PEGs onto the POSS macromonomers (Q8M8 H and T8 H) clearly demonstrated a chain-length-dependent increase in T g and a concomitant suppression of crystallization.