Abstract
We designed a straightforward avenue to obtain single-chain polymeric nanoparticles using photoactive 4-armed star copolymers which are synthesized by a controlled radical polymerization strategy. Constructed star copolymers undergo intramolecular crosslinking upon Ultra-violet irradiation in dilute conditions (cpolymer = 0.5 mg mL−1). Resulting crosslinked products have smaller particle size and higher glass transition temperature compared to their star copolymer analogues. Polymeric nanoparticles exhibit globular structure and more compact morphology as expected. The formation of star polymers and their single-chain products were characterized by size exclusion chromatography (SEC), SEC with UV, multi-angle light scattering (MALS), proton nuclear magnetic resonance spectroscopy (1H NMR), diffusion ordered spectroscopy (DOSY), dynamic light scattering (DLS), transmission electron microscopy (TEM), Ultra-violet and fluorescence spectroscopies.
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