Journal
MACROMOLECULES
Volume 47, Issue 15, Pages 4901-4907Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma5010265
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Funding
- Scientific Research on Innovative Areas New Polymeric Materials Based on Element-Blocks programs [25102535]
- JST SENTANKEISOKU [13A0004]
- Ministry of Education, Culture, Sports, Science, and Technology, Japan
- [24350061]
- Grants-in-Aid for Scientific Research [25102535] Funding Source: KAKEN
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Well-defined poly(methacrylate)s with liquid crystal side chains, designated as PPHM, were synthesized by a living anionic polymerization method. Introducing a short-length alkyl chain at the end of the side chain, the solubility of the polymer was improved, resulting in higher molecular weight polymers. While the highest weight-average molecular weight (M-w) of PPHM was 68k, it exceeded 100k for a slight-polydisperse PPHM. Wide-angle X-ray diffraction (WAXD) revealed that PPHM formed a smectic A phase with 2.7 nm layer spacing and that the layer structure is present even in the glassy state at room temperature. Molecular aggregation states of PPHM in surface regions of films were characterized by sum-frequency generation, grazing-incidence WAXD, and contact angle measurements. The results show that the PPHM with a larger M-w formed a layer structure parallel to the film plane. Although low M-w PPHM also maintained a layer structure, the structure became more random within internal regions. The surface reorganization of PPHM with larger M-w was suppressed in comparison with smaller ones.
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