Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 43, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202200096
Keywords
polyampholytes; RAFT; tetrazole
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A new family of polyampholytes (PAMs) with nitrogen functional groups as both the basic and acidic groups is described. The synthesis of the well-defined statistical PAMs is confirmed through various spectroscopic techniques. Aqueous electrophoresis results indicate the isoelectric points (pI) of the PAMs, which are somewhat insensitive to the copolymer composition.
A new family of polyampholytes (PAMs) is described in which both the basic and acidic groups are based on nitrogen functional groups. Reversible addition-fragmentation chain transfer-prepared poly(pentafluorophenyl acrylate) is quantitatively modified sequentially with 3-picolylamine and 5-aminotetrazole, yielding the new well-defined statistical PAMs. Successful formation of the PAMs is confirmed via a combination of F-19 and C-13 NMR spectroscopy and FTIR. Aqueous electrophoresis indicates isoelectric points (pI) between 2.9 and 4.4 depending on copolymer composition. However, the pI is somewhat insensitive to the copolymer composition, a feature attributed to the similarity of the pK(a)s of the acid tetrazole species and the conjugate acid of the pyridyl repeat units.
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