Zwitterionic nano-objects having functionalizable hydrophobic core: Formation via polymerization-induced self-assembly and their morphology. (5th October 2022)

• Record Type: Journal Article
• Authors: Damsongsang, Panittha; Yusa, Shin-ichi; Hoven, Voravee P.
• Is Part Of: European polymer journal. Volume 179(2022)
• Publication Date: 2022-10-05
• Subjects: PISA -- Block copolymer -- PMPC -- Polymer precursor -- Core functionalization; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; Polymerization; Polymers; Periodicals; Electronic journals; 547.705
• DOI: 10.1016/j.eurpolymj.2022.111536
• Languages: English
• ISSNs: 0014-3057

Abstract

Graphical abstract: Highlights: Zwitterionic and functionalizable block copolymers were prepared by PISA. Morphologies of nanostructures depend on the relative length of the two blocks. The longer core-forming block than the stabilizing block promoted aggregation. Nanostructures of high-order morphologies were not formed due to core inflexibility. Modification with 1-pyrenemethylamine yielded fluorescently labeled nanostructures. Abstract: Functionalizable poly(pentafluorophenyl methacrylate) (PPFPMA) and zwitterionic poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC) are two polymers with an extremely different solubility. It is, therefore, almost impossible to synthesize their block copolymers in a controlled manner using a conventional approach. Herein, it is demonstrated, for the first time, that the synthesis and in situ formation of nanoassemblies of their diblock copolymers (PMPC- b -PPFPMA) can be achieved via polymerization-induced self-assembly using reversible addition-fragmentation chain-transfer dispersion polymerization in ethanol as a selective solvent. The PMPC was synthesized as the first block and further employed as a macro chain transfer agent (PMPC Macro-CTA) for the synthesis of the PPFPMA second block. In situ self-assembled nanostructures of the diblock copolymers were found to be mostly spherical with a varied degree of inter-micellar aggregation depending on the solid concentration and the relative length of the two blocks. Apparently, the limited chain mobility of the core-forming PPFPMA block, due to π-π stacking and hydrophobic interactions, hampered the formation of nanostructures of high-order morphologies. It is possible to perform core functionalization via post-polymerization modification with 1-pyrenemethylamine to yield fluorescently labeled nanostructures that may be applicable as biocompatible and non-fouling nanocarriers and nanosensors in the future.