title: Characterization of a new stationary phase based on microwave immobilized polybutadiene on titanium oxide-modified silica.
abstract: Titanium oxide-modified silica was prepared by reaction of silica with titanium tetrabutoxide and then was used as support in the preparation of stationary phases with self-immobilized polybutadiene (PBD) and PBD immobilized through microwave radiation. Chromatographic performance of the stationary phases was evaluated in terms of the efficiency (plates/m), asymmetry (A(s)), retention factor (k) and resolution (R(s)) of two standard sample mixtures, one of then containing the basic compound N,N-dimethylaniline. A microwave irradiation of 30 min at 520 W gave the best efficiency (86,500 N m(-1)), greater than that of a 6-day self immobilized phase (69,500 N m(-1)). Self-immobilized stationary phases prepared with bare silica were also studied for comparison. These resulted in lower chromatographic performance, 43,800 N m(-1), when compared to the self-immobilized phase prepared with titanized silica.
authors.affiliation: Laboratório de Pesquisas em Cromatografia Líquida-LABCROM, Instituto de Química, Universidade Estadual de Campinas, Caixa Postal 6154, CEP 13084-971 Campinas, SP, Brazil.
authors.forename: Lais S R
authors.initials: LS
authors.lastname: Morais
authors.forename: Isabel C S F
authors.initials: IC
authors.lastname: Jardim
mesh_terms: D002070:Butadienes / Q000737:chemistry*; D020724:Elastomers; D008872:Microwaves; D011108:Polymers / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D002070:Butadienes; D020724:Elastomers; D011108:Polymers; C009495:titanium dioxide; D012822:Silicon Dioxide; C028834:polybutadiene; D014025:Titanium