| 초록 |
The characterization of such model branched polymers usually is based on SEC, assisted by membrane osmometry, light scattering. However, the resolution of SEC is not good enough to characterize the polymers with complex chain architecture. In this study, we demonstrate the utility of the temperature gradient interaction chromatography (TGIC) to characterize comb shaped polystyrene (PS) more rigorously. The PS combs are successfully fractionated in terms of the molar mass (different number of branches) with high resolution by TGIC. We found an intriguing isotope effect (deuterium vs. hydrogen) in the reversed phase (RP) TGIC while the isotope effect is supressed in normal phase (NP) chromatography. Combining RP- and NP-TGIC, we were able to characterize the partially deuterated PS combs (hydrogeneous backbone and deuterated branches) in more detail. |
