title: Cholesterol mesogen containing water-soluble copolymers: design and organization behavior at different interfaces.
abstract: Cholesterol mesogen containing monomer, cholesteryl acrylamido butyrate (CAB) with the novel spacer group drawn from 4-amino butyric acid has been demonstrated to exhibit good reactivity with 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS) to yield copolymers with CAB content as high as 15 mol % hitherto not achieved. The spacer group is shown to provide the twin benefits of enhanced reactivity and solubility in water. The high pK(a) at > or =9.90 of these copolymers estimated from potentiometric studies demonstrates packing of AMPS segments as ionic clusters. The higher CAB in copolymer C provides the most densely packed nonpolar microdomains. From fluorescence quenching studies, the cross-linking provided by the cholesterol chains favoring intra- or intermolecular aggregated structures has been established. At the air/solution interface, copolymer C exhibits the most close-packed structures exhibiting "a" of 41.2 A(2)/molecule. The effect of neutralization on the adsorption characteristics is investigated.
authors.affiliation: Industrial Chemistry Laboratory, Central Leather Research Institute, Adyar, Chennai 600020, India.
authors.forename: K
authors.initials: K
authors.lastname: Chandrasekar
authors.forename: Geetha
authors.initials: G
authors.lastname: Baskar
mesh_terms: D000178:Acrylamides / Q000737:chemistry*; D000476:Alkanesulfonates / Q000737:chemistry*; D002784:Cholesterol / Q000737:chemistry; D002788:Cholesterol Esters / Q000138:chemical synthesis / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D012995:Solubility; D012996:Solutions / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D000178:Acrylamides; D000476:Alkanesulfonates; D002788:Cholesterol Esters; D005456:Fluorescent Dyes; D011108:Polymers; D012996:Solutions; C521887:cholesteryl acrylamido butyrate; D014867:Water; C056288:2-acrylamido-2-methylpropanesulfonate; D002784:Cholesterol