Hydrophobically Associating Ionic Copolymers of Methyldiallyl-(1,1-dihydropentadecafluoro-octoxyethyl)ammonium Chloride

ABSTRACT:A hydrophilic monomer (diallyldimethylammonium chloride), a hydrophobic monomer (diallyloctadecylammonium chloride), and sulfur dioxide are cycloterpolymerized in dimethylsulfoxide using azobisisobutyronitrile as the initiator to afford water-soluble cationic polyelectrolytes having a five-membered cyclic structure on the polymeric backbone. The molecular weights of the polymers containing varying amounts of the hydrophobic monomer (0 -7.5 mol %) are determined by light-scattering experiments. The solution properties of the series of cationic polyelectrolytes are investigated by viscometric techniques. A polymer concentration (C* HA ) of Ͻ1 g/dL is required for the manifestation of hydrophobic associations in these terpolymers containing C 18 hydrophobic pendents. This is a notable improvement over the C* HA values (ca. 15-17 g/dL) for the associating cyclopolymers having a pendant length of C10 to C14. The polymer solutions exhibit a sharp increase in viscosity with increasing polymer concentrations in salt-free as well as salt-added solutions. The presence of sodium chloride is shown to enhance the hydrophobic association tremendously.

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Amphiphilic cycloterpolymers of diallyldimethylammonium chloride, diallyloctadecylammonium chloride, and sulfur dioxide

Ali

Umar

Abu-Sharkh

2005

J of Applied Polymer Sci

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The effects of zwitterionic and anionic charge densities in polymer chains on the viscosity behavior of a pH‐responsive hydrophobically modified ionic polymer

Umar

Abu-Sharkh

Ali

2005

J of Applied Polymer Sci

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Sulfur dioxide, N,N-diallyl-N-carboethoxymethylammonium chloride, and the hydrophobic monomer N,N-diallyl-N-octadecylammonium chloride were cyclocopolymerized in dimethyl sulfoxide using azobisisobutyronitrile (AIBN) as the initiator to afford water-soluble cationic polyelectrolytes (CPE) having a five-membered cyclic structure on the polymeric backbone. The CPE on acidic hydrolysis of the pendent ester groups gave the corresponding cationic acid salts (CAS), which, on treatment with sodium hydroxide, were converted to polybetaines (PB) and anionic polyelectrolytes (APE), as well as polymers PB/APE containing various proportions of zwitterionic (PB) and anionic fractions (APE) in the polymer chain. The solution properties of the CPE, APE, and PB/APE systems containing varying amounts of the hydrophobic monomers in the range 0 -4 mol % were investigated by viscometric techniques. Treating the pH-responsive CAS polymers 4 with different equivalents of NaOH varied the zwitterionic and anionic charge densities in the polymer chain. It was found that the PB/APE polymer with a ratio of 33 : 67 for the zwitterionic and anionic fractions in the polymer chain, respectively, gave the highest viscosity value. The polymers showed that concentration (C* HA ) of around 1 g/dL was required for the manifestation of significant hydrophobic associations.

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Synthesis and viscosity of hydrophobically modified polymers containing dendritic segments

Ali

Umar

Al‐Muallem

et al. 2008

J of Applied Polymer Sci

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The cycloterpolymerizations of a newly synthesized dendritic quadruple-tailed hydrophobic diallylammonium chloride with the hydrophilic monomer N,N-diallyl-N-carboethoxymethylammonium chloride and sulfur dioxide afforded a series of water-soluble cationic polyelectrolytes (CPEs) containing various proportions (0-1 mol %) of the hydrophobe. At a shear rate of 0.36 s 21 at 308C, saltfree water solutions of the CPEs (4 g/dL) containing 0, 0.35, 0.53, 0.65, and 0.93 mol % of the hydrophobe had apparent viscosity values of 140, 1200, 180,000, 308,000, and 858,000 cps, respectively. The study clearly demonstrated an increase in the viscosity values with increasing incorporation of the hydrophobes. The CPEs on acidic hydrolysis of the pendant ester groups gave corresponding pH-responsive cationic acid salts, which upon treatment with NaOH, were converted to the polybetaines (PBs), anionic polyelectrolytes (APEs), and PB/APEs containing various proportions of PB and APE fractions in the polymer chain. The effects of charge type and charge density on the polymer chain were investigated. Polymer surfactant interactions were investigated with the cationic surfactant cetyltrimethylammonium bromide; a considerable increase in the viscosity values of the CPE was observed in the presence of the surfactant. The superior viscosity behavior for the polymers containing the quadruple-tailed hydrophobe was attributed to the blocky nature of the comonomer.

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Hydrophobically Associating Ionic Copolymers of Methyldiallyl-(1,1-dihydropentadecafluoro-octoxyethyl)ammonium Chloride

Cited by 11 publications

References 1 publication

Amphiphilic cycloterpolymers of diallyldimethylammonium chloride, diallyloctadecylammonium chloride, and sulfur dioxide

Amphiphilic cycloterpolymers of diallyldimethylammonium chloride, diallyloctadecylammonium chloride, and sulfur dioxide

The effects of zwitterionic and anionic charge densities in polymer chains on the viscosity behavior of a pH‐responsive hydrophobically modified ionic polymer

Synthesis and viscosity of hydrophobically modified polymers containing dendritic segments

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