Star Poly(N -isopropylacrylamide) tethered to polyhedral oligomeric silsesquioxane (POSS) nanoparticles by a combination of ATRP and click chemistry

Shiao Wei Kuo*, Jing Long Hong, Yu Chan Huang, Jem Kun Chen, Shih Kang Fan, Fu-Hsiang Ko, Chih Wei Chu, Feng Chih Chang

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

New star poly(N-isopropylacrylamide)-b-polyhedral oligomeric silsesquioxane (PNIPAm-b-POSS) copolymers were synthesized from octa-azido functionalized POSS (N3-POSS) and alkyne-PNIPAm, which was prepared using an alkyne-functionalized atom transfer radical polymerization (ATRP) initiator (propargyl 2-bromo-2-methylpropionamide), via click chemistry. These star PNIPAm-b-POSS copolymers undergo a sharp coil-globule transition in water at above 32C changing from a hydrophilic state below this temperature to a hydrophobic state above it, which is similar to linear PNIPAm homopolymers. More interestingly, we found that these star polymers exhibited strong blue photoluminescence in water above a lower critical solution temperature (LCST). This photoluminescence was likely due to the constrained geometric freedom and relatively rigid structure caused by intramolecular hydrogen bonding within the star PNIPAm polymers, which exhibit an intrinsic fluorescent behavior.

Original languageEnglish
Article number749732
JournalJournal of Nanomaterials
Volume2012
DOIs
StatePublished - 16 Jul 2012

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