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Study on the aggregation behavior of polyhedral oligomeric silsesquioxane compounds in solution
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DOI：10.1093/bulcsj/uoag045.png)
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Abstract
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Polyhedral oligomeric silsesquioxane (POSS) has been extensively studied as an essential building block in polymer matrices to improve their thermal and mechanical properties. Although the aggregation and dispersion state of POSS segments influence these properties, a deep understanding of POSS aggregation behavior is lacking. In this study, the aggregation behavior of heptaisobutyl-mono-substituted-POSS (7B1R-POSS) was investigated in chloroform (CHCl3), using a simplified model that eliminates various factors within polymer matrices, in order to understand the mechanism of POSS molecule aggregation. The UV-vis spectra of 7B1R-POSS solutions with varying concentrations revealed a critical aggregation concentration (CAC), indicating that 7B1R-POSS formed aggregates in CHCl3. Dynamic light-scattering measurements of 7B1R-POSS solutions above the CAC suggested that most of the aggregation particles were of the order of nanometers and that very few aggregates of a few hundred nanometers were formed. It was found that all 7B1R-POSS exhibited temperature-responsive reversible aggregation behavior, aggregating upon heating, and dispersing upon cooling. This behavior is similar to the entropy-driven behavior observed in polymer micelles, which is known as hydrophobic behavior. In this work, the entropy-driven dominant aggregation behavior in the aggregates of 7B1R-POSS was exhibited.
Keywords:
aggregation
organic-inorganic hybrid
silsesquioxane
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