Effect of self-organization in poly(di-n-hexylsilane) films
| Autor: | N. Ostapenko, Viktor Zaika, Akira Watanabe, Shozo Suto |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Materials science
Birefringence Absorption spectroscopy business.industry Physics::Optics Thermal treatment law.invention Condensed Matter::Soft Condensed Matter Condensed Matter::Materials Science Crystallography Optics Optical microscope Liquid crystal law Phase (matter) Absorption (chemistry) Luminescence business |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| Popis: | The changes in conformation and organization of poly(di-n-hexylsilane) (PDHS) chains initiated by heating the films above the phase transition temperature are investigated by optical spectroscopy, polarizing optical microscopy, and birefringence techniques. Appearance of two new absorption bands is observed after thermal treatment of the samples and explained by transition of PDHS into liquid-crystalline (LC) phase. Existence of the LC phase is confirmed by presence of birefringence in PDHS films at these temperatures and by stable orientation of nematic liquid crystal disposed on the thermally treated polymer. A pattern corresponding to classical columnar liquid-crystalline optical textures is observed under polarizing optical microscope above the phase transition temperature. An increased orientational order and defects created at cooling the polymer films down to room temperature are manifested by several new absorption and luminescence bands. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|