【摘 要】
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Polymerization-induced self-assembly (PISA) is an efficient and versatile method to afford polymeric nano-objects with polymorphic morphologies.Compared to disp
【机 构】
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Institute of Nanochemistry and Nanobiology, College of Environmental and Chemical Engineering, Shang
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Polymerization-induced self-assembly (PISA) is an efficient and versatile method to afford polymeric nano-objects with polymorphic morphologies.Compared to dispersion PISA syntheses based on soluble monomers,the vast majority of emulsion PISA formulations using insoluble monomers leads to kinetically-trapped spheres.Herein,we present aqueous emulsion PISA formulations generating worms and vesicles besides spheres.Two monomers with different butyl groups,n-butyl (nBHMA) and tert-butyl (tBHMA) a-hydroxymethyl acrylate,and thus possessing different water solubilities were synthesized via Baylis-Hillman reaction.Photoinitiated aqueous emulsion polymerizations of nBHMA and tBHMA employing poly(ethylene glycol) macromolecular chain transfer agents (macro-CTAs,PEG45-CTA,and PEG113-CTA) at 40 ℃ were systematically investigated to evaluate the effect of monomer structure and solubility on the morphology of the generated block copolymer nano-objects.Higher order morphologies including worms and vesicles were readily accessed for tBHMA,which has a higher water solubility than that of nBHMA.This study proves that plasticization of the core-forming block by water plays a key role in enhancing chain mobility required for morphological transition in emulsion PISA.
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