| 학회 | 한국고분자학회 |
| 학술대회 | 2003년 가을 (10/10 ~ 10/11, 부경대학교) |
| 권호 | 28권 2호, p.18 |
| 발표분야 | 특별 심포지엄 |
| 제목 | Effect of Hydrostatic Pressure on Phase Behavior of deuterated polystyrene-block-(poly(n-pentyl methacrylate) (PS-PnPMA) Copolymers and dPS/PnPMA Mixtures |
| 초록 | The effect of hydrostatic pressure on block copolymer and homopolymer blend was investigated by using small angle neutron scattering as well as birefringence measurement. For d-polystyrene-block-poly(n-pentyl methacrylates) diblock copolymer [dPS-PnPMA], at ambient pressure, with increasing temperature, dPS-PnPMA exhibited LDOT and UODT. These two transitions consist of lower and upper loops, resulting in a closed-loop type phase transition. Interestingly, with increasing pressure both LDOT and UODT were shifted enormously. The coefficient of d(LDOT)/dp was 725 oC/Kbar, whereas was d(UODT)/dp was ?25 oC/Kbar. The values are consistent with predictions by the Clausis-Claperon equation obtained from the experimentally measured values of the volume and enthalpy changes at both transitions. This block copolymer can be used as a tool for making highly responsive materials to pressure. For the corresponding homopolymer blend [dPS/PnPMA], at low pressure, this appeared two separate UCST and LCST occurring at low and high temperatures, respectively. With increasing pressure, however, complicated phase behavior was found, UCST at low temperature and closed-loop phase behavior at high temperature. Small-angle neutron scattering was performed at the Hanaro SANS beamline supported by KAERI and KISTEP. Small-angle X-ray scattering was performed at the PLS beamline supported by POSCO and KOSEF. |
| 저자 | 류두열1, 정운용1, 이동현1, 이동준1, 장진1, 김진곤1, Kristopher A. Lavery2, Thomas P. Russell2 |
| 소속 | 1포항공대화공과, 2UMASS at Amherst |
| 키워드 | SAXS; SANS; block copolymer; blend |
