Study on preparation and associative properties of fluorinated hydrophobically associating polyacrylamide
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This paper describes the preparation of a novel fluorinated surface-active monomer (FSM) based on isophorone diisocyanate (IPDI), dodecafluoroheptanol (FOH) and allyl polyethylene glycol (APEG1000) and its copolymer (FAPAM) with 2-acrylamido -2- methyl propane sulfonic acid (AMPS) and acrylamide (AM) through a new micellar system. The chemical structures of FSM-1 and FSM were characterized by FT-IR and 1H-NMR. The hydrophobically associative behaviors of FAPAM as well as the relationship between the content of monomers and hydrophobically associative properties were studied by a combination of viscosimetry, rheological measurements, fluorescence spectroscopy and dynamic light scattering (DLS). The influences of sodium dodecyl benzene sulfonate (SDBS) on associative properties of FAPAM were also studied. The results showed that the micellar copolymerization of AM, AMPS and polymerizable fluorinated surfactant FSM can be favorably realized. The hydrophobically associative properties of FAPAM were affected by the content of FSM and AMPS. The incorporation of FSM endowed the copolymer with both stronger salt and heat resistance. SDBS with low concentration (below the CMC of SDBS) was good for associative properties of FAPAM under CAC (critical association concentration). When the FAPAM was above its CAC, the addition of SDBS into the solution was adverse to their associative properties of FAPAM.
KeywordsHydrophobic association Polymerizable fluorinated surfactant Polyacrylamide Associative properties
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