Sulfobetain, acrylate

Several papers compare the properties of sulfobetaine (meth)acrylic polymers. NMR spectra and solution properties of 23a and 23b [59,60] are correlated with data from the corresponding polycarbobetaines [26]. The photophysical and solution properties of pyrene-labeled 23c were studied in terms of fluorescence emission. Addition of surfactants induces the formation of mixed micelles in aqueous solution [61]. Excluded volume effects of the unlabeled polymer were measured by light scattering [62], its adsorption on silica was studied by adsorbance measurement and ellipsometry [62,63], and the electrostimulated shift of the precipitation temperature was followed at various electric held intensities [64]. Polysulfobetaines may accelerate interionic reactions, e.g., oxidation of ferrocyanide by persulfate [65]. The thermal and dielectric properties of polysulfobetaines 23d were investigated. The flexible lateral chain of the polymers decreased Tg, for which a linear relationship with the number of C atoms was shown [66,67]. 

Recent attempts to prepare 26 by RAFT, however, failed [153]. Double hydrophilic block copolymers of NIPAM and 23e [154], as well as of N,N-diethylacrylamide and 23b [155], were prepared with the CTA benzyl dithiobenzoate, and exhibit LCST and UCST behavior in water. The new polymer 51 is also part of amphiphiUc di- and triblock copolymers [152]. Diblock copolymers with poly(ethylene glycol) methyl ether acrylate, dimethylacry-lamide, or 4-vinylstyrene sulfonate are macrosurfactants with a switch-able hydrophobic block. Triblock copolymers containing additionally 4-vinylbenzoic acid differ in the nature of the hydrophilic part [152]. Near-monodisperse block copolymers of N,N-dimethacrylamide and 49a were synthesized in different ways via macro-CTAs of both monomers as the first step. Such sulfobetaine block polymers form aggregates in pure water but are molecularly dissolved after addition of salt [152,156,157]. 

AbA acrylated abietic acid, APS (NH4)2S20g, ARGET activators regenerated by electron transfer, t-BA tert-Butyl acrylate, CL e-caprolactone, DEAEMA 2-(diethylamino)ethyl methacrylate, DMAEMA iV,lV-dimethyl aminoethyl methacrylate, PEGMA polyfethylene glycol) methyl ether methacrylate, PMMAZO 6-[4-(4-methoxyphenyl azo)phenoxy]hexyl methacrylate, SBMA sulfobetaine methacrylate, St styrene, TEMED JV -tetramethyl ethylene diamine... 

Poly (A, iV-dially 1-A, A -dimethy 1-ammonium chloride) 1-pentanol/sulfobetaine/toluene and water poly(acrylic acid)/HCl and water 2003KOT 2010LIT... 

Kuo WH, Wang MJ, Chien HW, Wei TC, Lee C, Tsai WB. Surface modification with poly(sulfobetaine methacrylateco-acrylic acid) to reduce fibrinogen adsorption, platelet adhesion, and plasma coagulation. Biomacromolecules 2011 12 4348-56. 

The free radical polymerizations of 3-[(2-Acrylamido-2-mefliyl propyl)dimethylammonio]-l-propanesulfonate with acrylamide and/or acrylic acid, and 3-(i Tj -diallyl-i /-methylammonio)-l-propanesulfonate with A, iV diailyl-i, iV-dimethyl ammonium chloride or AT,A/-diallyl-iV,-methyl amine have been studied. Reactivity ratios indicate random incorporation of comonomers. Molecular weights range from 3.0 x 10 to 15.1 x 10 g mol for the acrylamido-based copolymers and from 2.2 x 10 to 6.0 x 10 g mol for the cyclocopolymers. Second virial coefficients and viscosities decrease as sulfobetaine content increa s for each of the copolymers. A transition from polyelectrolyte to polyampholyte behavior is observed with added NaCl for those copolymers with sulfobetaine monomer incorporation greater than 40 mol%... 

On the other hand, several polymers of acrylic acid (55), acrylamide (56), and (meth)acrylate with sulfobetain (57) or uracil side group (58) which undergo UCST (not LCST) phase separation, have been studied [209-214], as... 

---