Characterization of polystyrene and polyisoprene by normal-phase temperature gradient interaction  chromatography.
Temperature gradient interaction chromatography (TGIC) is applied to the characterization of polyisoprene (PI) and polystyrene (PS) using normal-phase (NP) stationary phase--bare silica or diol bonded silica. Tetrahydrofuran-isooctane mixtures are used as a mobile phase. PI and linear and star shaped PS samples are successfully fractionated in terms of the molecular mass with a high resolution comparable to that of reversed-phase (RP) HPLC. Temperature dependence of the retention shows that the enthalpy of adsorption of PS to the stationary phase is exothermic. In addition, some characteristic features of the NP-TGIC system relative to those of RP-TGIC are presented, which include a high sensitivity on the polar end group and the simultaneous size-exclusion chromatographic and TGIC characterization of PS and PI mixtures.
Department of Chemistry and Center for Integrated Molecular Systems, Pohang University of Science and Technology, South Korea.
W
W
Lee
D
D
Cho
B O
BO
Chun
T
T
Chang
M
M
Ree
D002070:Butadienes / Q000737:chemistry*; D002853:Chromatography, Liquid / Q000379:methods*; D045782:Hemiterpenes; D010420:Pentanes; D011137:Polystyrenes / Q000737:chemistry*; D013696:Temperature
D002070:Butadienes; D045782:Hemiterpenes; D010420:Pentanes; D011137:Polystyrenes; C005059:isoprene