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Published on: July 9, 2015
Complexation of syndiotactic polystyrene with 12-crown-4
Fumitoshi Kaneko1, Natsuko Kashihara, Tsuyoshi Tsuchida
1Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. toshi@chem.sci.osaka-u.ac.jp.
Solid-state complexation of syndiotactic polystyrene (sPS) with 12-crown-4 was achieved via guest exchange. The resulting clathrate complex maintained sPS helix conformation and incorporated four 12-crown-4 molecules per unit cell.
Area of Science:
- Polymer Science
- Supramolecular Chemistry
- Materials Science
Background:
- Syndiotactic polystyrene (sPS) can form clathrate complexes with various guest molecules.
- Guest exchange is a method to introduce new molecules into polymer matrices.
Purpose of the Study:
- To investigate the solid-state complexation of sPS with 12-crown-4.
- To characterize the structural and conformational changes during complex formation.
Main Methods:
- Solid-state guest exchange using a plasticizing agent.
- X-ray diffraction (XRD) for structural analysis.
- Thermogravimetric analysis (TGA) for thermal properties.
- Infrared (IR) and Raman spectroscopy for conformational analysis.
Main Results:
- Successful incorporation of 12-crown-4 into the crystalline regions of sPS films.
- Formation of an sPS/12-crown-4 clathrate complex with four 12-crown-4 molecules per unit cell.
- Minimal conformational changes in sPS helices upon complexation.
- 12-crown-4 adopted a C(i)-type conformation within the sPS complex.
Conclusions:
- Solid-state complexation of sPS with 12-crown-4 is feasible via guest exchange.
- The sPS/12-crown-4 complex exhibits a well-defined clathrate structure.
- The complexation process preserves the integrity of the sPS host structure.
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