| 학회 | 한국고분자학회 |
| 학술대회 | 2004년 가을 (10/08 ~ 10/09, 경북대학교) |
| 권호 | 29권 2호, p.510 |
| 발표분야 | 고분자 구조 및 물성 |
| 제목 | Viscosity of ABA triblock copolymer in Polar and Nonpolar solvent |
| 초록 | ABA triblock copolymer made up of long middle block(B) and short terminal blocks(A) is being widely used as thermoplastic elastomers. Block copolymers with non-polar hydrophobic polystyrene and polar hydrophilic poly(ethylene glycol) blocks has been prepared and the physical properties of the solutions of PS-PEG-PS in polar (dimethyl formamide, DMF) and non-polar solvent (benzene) were investigated1-3. Triblock copolymer, PS-PEG-PS was prepared by radical polymerization. Number-average molecular weight (Mn) of PS and PEG blocks were 1,800 and 4000, respectively. Polydispersity was measured to be 1.07. DMF and benzene (Duksan Co., Korea) were used without further purification. The molecular parameters of obtained PS-PEG-PS was characterized by gel permeation chromatography(GPC). GPC measurement was carried out at 25 oC using a Waters 616 HPLC chromatography equipped with Waters 2410 refractive index detector. Intrinsic viscosity was measured at 25 and 55 oC by Ubbelohde viscometer (Schott Co.) over the concentration range 0.1 ~ 0.5 g/dl. Figure. 1 shows plot of the relative viscosity (ηrel) vs concentration (c) for PS-PEG-PS. At 25 oC PS-PEG-PS solution in DMF gives higher viscosity than that in benzene because of electrical charge effect. At 55 oC, however, both solutions give similar viscosity. Figure 1. Plots of relative viscosity (ηrel) vs concentration for PS-PEG-PS solutions in DMF and Benzene at 25 oC. References 1. K. Yu, A. Eisenberg, Macromolecules, 29, 6359 (1996). 2. I. Szleifer, M. A. Carignano, Macromol Rapid Commun, 21, 423 (2000). 3. G. L. Jialanella, E. M. Firer, and I. Piirma, J Polym Sci Part A: Polym Chem, 30, 1025 (1992). |
| 저자 | 김은섭1, 김병철1, 안성국2, 조창기1 |
| 소속 | 1한양대, 2삼성전자 |
| 키워드 | polystyrene; poly(ethylene glycole); Ubbelohde viscometer; viscosity |
