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Order-Order Transition in Thin Films of a Diblock Copolymer Composed of a Linear Polymer Block and a Brush Polymer Block with Mesogenic Oligothiophenyl Bristles

2009년 8월 10일 10시 08분 27초
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목 17시 : 20분
고분자화학 - General Topics on Polymer Science I (대학원생 발표)
저자 및
안병철, 윤진환1, 진상우, 노예철, Tomoyasu Hirai2, Rina Maeda2, 박삼대, 김진철, 권원상, 김동민, 정정운, 김미희, 김경태, Teruaki Hayakawa2, 이문호
포항공과대학교 화학과, Korea
1University of Massachusetts, USA, Korea
2Tokyo Institute of Technology, Japan, Japan
In this study, we quantitatively investigated the temperature-dependent phase transition behaviors in thin films of an interesting semi-rod-coil diblock copolymer, poly(styrene)-b-poly(oligothiophene side chain modified isoprene) (PS-b-POTI), and the resulting morphological structures using synchrotron grazing incidence X-ray scattering combined with differential scanning calorimetry. These analyses provided detailed information about the morphologies of the phase-separated domains and the molecular structures formed in each domain. At room temperature, the diblock copolymer molecules in thin films were found to form an alternately stacked structure comprised of amorphous PS and smectic-A POTI microdomains whose stacking direction is parallel to the film plane. On heating, the films underwent a phase transformation to a hexagonal cylinder structure with cylindrical POTI domains in the PS matrix oriented normal to the film plane. This phase conversion is induced by the transformation of the POTI domains from a smectic-A phase to an isotropic phase, where the smectic-A phase is composed of a laterally ordered structure of interdigitated bristles in the POTI blocks. On the basis of these structural analysis results, we propose models for the molecular structures of the diblock polymer thin films at various temperatures.