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High Performance Polymers
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Rubbed Thin Films of Well-defined Brush Polyimides for Flat-Panel Liquid Crystal Displays: Surface Morphology, Molecular Orientation, and Liquid Crystal Alignability

Suk Gyu Hahm

Department of Chemistry, Polymer Research Institute, BK21 Program, and Department of Materials Science & Engineering, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea

Seung Woo Lee

Department of Chemistry, Polymer Research Institute, BK21 Program, and Department of Materials Science & Engineering, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea

Jinsuk Suh

Department of Chemistry, Polymer Research Institute, BK21 Program, and Department of Materials Science & Engineering, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea

Boknam Chae

Department of Chemistry, Polymer Research Institute, BK21 Program, and Department of Materials Science & Engineering, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea

Seung Bin Kim

Department of Chemistry, Polymer Research Institute, BK21 Program, and Department of Materials Science & Engineering, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea

Seong Joon Lee

Department of Chemistry, Polymer Research Institute, BK21 Program, and Department of Materials Science & Engineering, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea

Kyung Hoon Lee

Department of Chemistry, Polymer Research Institute, BK21 Program, and Department of Materials Science & Engineering, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea

Jin Chul Jung

Department of Chemistry, Polymer Research Institute, BK21 Program, and Department of Materials Science & Engineering, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea

Moonhor Ree

Department of Chemistry, Polymer Research Institute, BK21 Program, and Department of Materials Science & Engineering, Pohang University of Science and Technology (Postech), Pohang 790-784, Republic of Korea

A series of well-defined brush polyimide (PI) composed of two 4-n-alkyloxyphenyloxy bristles per repeat unit on a semi-rigid poly(4,4'-methylenyldiphenylene pyromellitimide), Cm-PMDA-MDA PIs, were synthesized and their nanoscale thin films prepared by conventional spin-coating of their soluble poly(amic acid) precursor solutions and subsequent drying and thermal imidization in a nitrogen atmosphere. All the PIs were determined to be a positively birefringent polymer. The surface morphology and molecular orientation of each PI in films before and after rubbing were investigated in detail by atomic force microscopy, optical retardation analysis, and linearly polarized infrared spectroscopy. The sequence of the rubbing-induced polymer segmental orientations was further investigated in detail. In addition, the liquid crystal alignment and pretilt ability of the rubbed PI films were examined, and their thermal stability investigated. The present study provides important information on the sequence of the polymer segmental orientations induced by rubbing and additionally the mechanisms of the alignment and pretilt of liquid crystal molecules in contact with the rubbed PI film surface.

Key Words: Brush polyimide • semi-rigid polyimide backbone • bristle • rubbing • polymer segmental orientation • orientation sequence • FTIR • two-dimensional correlation analysis • liquid crystal alignment • pretilt angle

High Performance Polymers, Vol. 18, No. 5, 549-577 (2006)
DOI: 10.1177/0954008306068117
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