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Molecular characteristics and surface layer structure of poly(siloxane imides) |
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| Authors: | A. E. Grishchenko O. V. Khudyakova N. A. Mikhailova A. S. Gubarev A. N. Ionov M. N. Nikolaeva V. M. Svetlichnyi |
| Affiliation: | (1) Fock Institute of Physics, St. Petersburg State University, Ul’yanovskaya ul. 1, Petrodvorets, 198504, Russia;(2) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(3) Institute of Macromolecular Compounds, Russian Academy of Sciences, Bol’shoi pr. 31, St. Petersburg, 199004, Russia |
| Abstract: | The effects of spontaneous ordering of molecular chains of poly(siloxane imide) block copolymers in the surface layers of thin films on glass and gold supports have been studied by the oblique polarized beam and photoelasticity methods. The effective thermodynamic rigidity of molecular chains of the block copolymers (the statistical segment length) has been found to be A = 10.4 × 10?7 cm. The orientational ordering of molecular chains in poly(siloxane imide) surface layers is characterized by small values of the orientational order parameter (S 0 ～ 0.007). This finding is explained by the microphase separation of the block copolymers. The evaporated gold layer contributes to the effect of surface birefringence owing to formation of the ordered system composed of islets—clusters of gold atoms. |
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