| 학회 | 한국고분자학회 |
| 학술대회 | 2002년 가을 (10/11 ~ 10/12, 군산대학교) |
| 권호 | 27권 2호, p.1 |
| 발표분야 | 초청특별강연 |
| 제목 | HPLC Characterization of Polymers |
| 초록 | Liquid chromatography (LC) has been used widely for the characterization of natural and synthetic macromolecules that are often heterogeneous in molecular weight, molecular architecture as well as in chemical composition. Among numerous variations of LC technique, size exclusion chromatography (SEC) has been the most popular method for the analysis of the molecular weight distribution of synthetic polymers. SEC fractionates polymer molecules by partitioning polymer molecules between a solution phase located at the interstitial space and the pore volume of the porous column packing materials. The partition equilibrium is mainly governed by the conformational entropy difference of the polymer chains in two different physical environments. Thus, SEC separates the polymer molecules in terms of the size of a single polymer molecule in the elution solvent. As a consequence SEC is often inefficient in separating copolymers, polymer mixtures, branched polymers, polymers with different tacticity or end-group difference, and so on. Furthermore, the resolution SEC is limited by the complication of band-broadening. In contrast to SEC, interaction chromatography (IC) utilizes mainly the enthalpic interaction, adsorption or partitioning of solute molecules to the stationary phase, thus IC can be used efficiently for the applications in which SEC does not work well. In this talk, IC methods for the characterization of polymers will be discussed with emphasis on the temperature gradient interaction chromatography (TGIC) that was recently developed in our laboratory. In TGIC the column temperature is varied during the elution in a pre-programmed manner to control the solute retention. Successful applications include: 1. Rigorous characterization of the molecular weight distribution of the polymers made by anionic polymerization. 2. High-resolution separation of branched polymers, cyclic polymers, polymer mixtures, and stereoregular polymers. 3. High-resolution fractionation of individual blocks of block copolymers. |
| 저자 | 장태현 |
| 소속 | 포항공과대 |
| 키워드 | HPLC; Polymer; Characterization |
| VOD | VOD 보기 |
