| 학회 | 한국고분자학회 |
| 학술대회 | 2003년 가을 (10/10 ~ 10/11, 부경대학교) |
| 권호 | 28권 2호, p.158 |
| 발표분야 | 기능성 고분자 |
| 제목 | Destructive Interference between Molecular and Form Birefringence in a Semicrystalliine Block Copolymer |
| 초록 | Abstract Two different types of optical anisotropy: molecular and form birefringence were investigated in a poly (ethylene-b-ethylene-alt-propylene-b-styrene) semicrystalline terblock copolymer. The molecular birefringence originated from the anisotropic crystalline structure of poly(ethylene) destructively interacts with the form birefringence resulted from uniaxially oriented cylindrical poly(styrene) microdomains. The positive form birefringence above the melting temperature of the polyethylene was transformed into a negative birefringence upon the crystallization of the polyethylene block. At a point where these two types of birefringence destructively interfered each other, the block copolymer showed optically isotropic behavior, leading to darkness under crossed polarizers. The competition between different birefringences was explained using a simple geometric composite model. The materials with both molecular and form birefringence are potentially useful as a temperature sensor optically manipulated. |
| 저자 | 황지영1, 정범석2, 박철민1 |
| 소속 | 1연세대, 2한국과학기술원 고분자하이브리드센터 고분자 물리연구실 |
| 키워드 | Block Copolymer; Birefringence; cylindrical microdomains; temperature sensor |
