Quek, Jing Yang; Roth, Peter J.; Evans, Richard A.; Davis, Thomas P.; Lowe, Andrew B. published the artcile< Reversible addition-fragmentation chain transfer synthesis of amidine-based, CO2-responsive homo and AB diblock (Co)polymers comprised of histamine and their gas-triggered self-assembly in water>, Related Products of 71195-85-2, the main research area is fluoropolymer radical polymerization RAFT hydrodynamic radius self assembly micelle.
Well-defined homopolymers of pentafluorophenyl acrylate (PFPA) and AB diblock copolymers of N,N-dimethylacrylamide (DMA) and poly(ethylene glycol) Me ether acrylate (PEGA) with PFPA were prepared by reversible addition-fragmentation chain transfer (RAFT) radical polymerization Three PFPA homopolymers of different mol. weights were reacted with the com. available amidine and guanidine species histamine (HIS) dihydrochloride and L-arginine Me ester (ARG) dihydrochloride in the presence of S-Me methanethiosulfonate to yield, quant., the corresponding amidine and guanidine-based acrylamido homopolymers. Both the HIS and ARG homopolymers are known to reversibly bind CO2 with, in the case of the former, CO2 fixation being accompanied with a switch from a hydrophobic to hydrophilic state. The RAFT synthesis of PFPA-DMA and PEGA-PFPA diblock copolymers yielded well-defined materials with a range of molar compositions These precursor materials were converted to the corresponding HIS and ARG block copolymers whose structure was confirmed using 1H NMR spectroscopy. Employing a combination of dynamic light scattering and transmission electron microscopy, we demonstrate that the DMA-HIS and PEGA-HIS diblock copolymers are able to undergo reversible and cyclable self-directed assembly in aqueous media using CO2 and N2 as the triggers between fully hydrophilic and amphiphilic (assembled) states. For example, in the case of the 54:46 DMA-HIS diblock, aggregates with hydrodynamic diameters of about 40.0 nm are readily formed from the molecularly dissolved state. © 2012 Wiley Periodicals, Inc., J Polym Sci Part A: Polym Chem, 2012.
Journal of Polymer Science, Part A: Polymer Chemistry published new progress about Fluoropolymers Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), SPN (Synthetic Preparation), PROC (Process), PREP (Preparation). 71195-85-2 belongs to class esters-buliding-blocks, and the molecular formula is C9H3F5O2, Related Products of 71195-85-2.
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