Bulletin of the Korean Chemical Society

  • 제28권5호
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  • Pages.795-799
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  • 2007
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Conformational Transition of Poly(γ-benzyl-L-glutamate)-Poly(ethylene glycol) Block Copolymers in Bulk

  • 발행 : 2007.05.20
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초록

The bulk properties of poly(γ-benzyl-L-glutamate)-poly(ethylene glycol), PBLG-PEO, diblock copolymer were investigated. The helical transition from 7/2 to 13/5 for pure PBLG was at 120 oC while those of GE-1 and GE-2, which contain flexible PEO block 40 wt% and 60 wt% respectively, were shown at 135℃ on DSC experiments. FT-IR and XRD experiments were shown that the diblock copolymers maintained their α-helical structure in the temperature range between 25℃ and 175℃. Increasing relative size of coil part resulted in the increase of intermolecular packing distances. Due to well-maintained helical structure, lyotropic LC phases were observed for the PBLG-PEO block copolymer by the polarized optical microscope (POM). Especially, GE-3 copolymer, which has 12.5 wt% PEO contents, showed the smectic C phase. The competition of favorable aggregation energy between rod-rod and coil-coil, and unfavorable aggregation energy of rod-coil give rise to change the supramolecular structure in mixed solvent.

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피인용 문헌

  1. Synthesis and Characterization of a Block Copolymer Containing Regioregular Poly(3-hexylthiophene) and Poly(γ-benzyl-L-glutamate) vol.32, pp.3, 2010, https://doi.org/10.1002/marc.201000502
  2. Interrelation between the structural and transport properties of pervaporation membranes with diffusion layers based on poly-γ-benzyl-L-glutamate vol.56, pp.3, 2011, https://doi.org/10.1134/S1063774511030126