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Synthesis and solution properties of fluorocarbon‐modified poly( N,N ‐dimethylacrylamide)
Author(s) -
Chen Jie,
Du LiBin,
Zhang YunXiang,
HogenEsch Thieo E,
Jiang Ming
Publication year - 2001
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/1097-0126(200101)50:1<148::aid-pi610>3.0.co;2-#
Subject(s) - fluorocarbon , polymer science , materials science , polymer chemistry , chemical engineering , composite material , engineering
Poly( N,N ‐dimethylacrylamide) (PDMA) containing perfluoro‐octyl pendent groups was prepared by solution polymerization of N,N ‐dimethylacrylamide in benzene with 0.16 –1.25 mol% 2‐( N ‐ethylperfluoro‐octane sulfonamido) ethyl acrylate (FX‐ 13®) or 2‐( N ‐ethylperfluoro‐octane sulfonamido) ethyl methacrylate (FX‐14®). The copolymer intrinsic viscosity strongly decreases with increasing comonomer content due to intramolecular association. However, the Huggins constant increases more than 40‐fold with increasing comonomer content, indicating that intermolecular association increases with increasing comonomer content. Strong Brookfield viscosity enhancements are observed above a critical copolymer concentration varying between 0.5 and 2.0 wt% depending on comonomer type and content. Some of the copolymers show pseudoplastic behaviour whereas others show shear‐thickening or both types of behaviour. These observations are consistent with competing inter‐ and intramolecular micellar association. Fluorescence studies using a perfluorocarbon‐substituted pyrene as a probe indicate the formation of hydrophobic microdomains formed by the association of perfluorocarbon groups. © 2001 Society of Chemical Industry