کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5179693 | 1502520 | 2016 | 7 صفحه PDF | دانلود رایگان |
- Covalently linked POSS into the main chain of polysiloxane is prepared via dehydrocarbonative polycondensation reaction.
- Substitution reaction on the side-chain of polymer enables tunable post-substitution modification reactions.
- Highly optical transparency, hydrophobicity, thermal stability and Tg of polymeric films are obtained.
Chlorine-containing poly(siloxane/double-decker silsesquioxane) (P-Cl) was prepared in high yield at ambient room temperature via dehydrocarbonative polycondensation reaction between di[(3-chloropropyl)isopropoxysilyl]-bridged double-decker octaphenylsilsesquioxane (DDSQ) and hexamethyltrisiloxane. Particular attention for this polymer was also given to its functionalization through substitution reaction, especially due to nucleophilic substitution on the side-chain of polymer at silsesquioxane units. But more important, the use of halogen exchange method with bromine anion allows the formation of more reactive, bromine-containing poly(siloxane/double-decker silsesquioxane) (P-Br), which enables further post-substitution modification reactions in a POSS unit. The glass transition temperatures (Tg â¼Â 15 °C) of both halogenated polymers were significantly higher than poly(dimethylsiloxane) (PDMS). High transparency of polymers with hydrophobic surface could be found from solvent-casting thin film.
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Journal: Polymer - Volume 86, 8 March 2016, Pages 113-119