Poly(ethylene glycol) Octafunctionalized Polyhedral Oligomeric Silsesquioxane:  WAXD and Rheological Studies

A homologous series of PEG (various chain length)-substituted octasilsesquioxanes prepared by the hydrosilylation of unsaturated PEGs (poly(ethylene glycol)s) with octa(dimethylsiloxy)silsesquioxane (Q8M8 H) were studied by wide-angle X-ray diffraction WAXD and rheology. The WAXD results indicate th...

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Bibliographic Details
Published inMacromolecules Vol. 40; no. 13; pp. 4530 - 4534
Main Authors Markovic, Elda, Matisons, Janis, Hussain, Manwar, Simon, George P
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 26.06.2007
Subjects
Applied sciences
Exact sciences and technology
Inorganic and organomineral polymers
Physicochemistry of polymers
Properties and characterization
Polyhedral molecule
Molten state
Supramolecular structure
Temperature effect
Silsesquioxane copolymer
Ethylene oxide copolymer
Experimental study
Block copolymer
Apparent viscosity
Rheological properties
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Summary:A homologous series of PEG (various chain length)-substituted octasilsesquioxanes prepared by the hydrosilylation of unsaturated PEGs (poly(ethylene glycol)s) with octa(dimethylsiloxy)silsesquioxane (Q8M8 H) were studied by wide-angle X-ray diffraction WAXD and rheology. The WAXD results indicate that neat POSS is highly crystalline material, while its PEG hybrids show evidence of small, disordered POSS crystals. Rheological characterization shows largely Newtonian behavior of POSS−PEG materials, with an interesting interplay between attached PEG chain length and weight fraction of POSS, with regards to melt viscosity and activation energy of flow.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma070276s