Poly(methylphenyl) silane: Structural properties

• Published in: Journal of polymer science. Part B, Polymer physics Vol. 35; no. 11; pp. 1727 - 1736
• Main Authors: Demoustier-Champagne, S., Jonas, A., Devaux, J.
• Format: Journal Article
• Language: English
• Published: New York John Wiley & Sons, Inc 01.08.1997; Wiley
• Subjects: Applied sciences; Exact sciences and technology; Inorganic and organomineral polymers; liquid crystal; mesophase; microstructure; Physicochemistry of polymers; polysilane; Properties and characterization; Structure factor; Thermotropic state; Temperature effect; Polysilane; Experimental study; Lattice parameters; Liquid crystals; Phase transitions; Atactic polymer; Crystalline structure
• ISSN: 0887-6266; 1099-0488
• DOI: 10.1002/(SICI)1099-0488(199708)35:11<1727::AID-POLB6>3.0.CO;2-P

The physical structure of poly(methylphenyl) silane (PMPS) has been investigated using wide‐angle x‐ray scattering at various temperatures and optical polarizing microscopy. The results obtained by these techniques clearly show the existence of an ordered phase in PMPS. The crystallinity of our sample was estimated to be about 10% at room temperature. Below 190°C, the atactic chains pack into a monoclinic crystalline lattice of near hexagonal symmetry, with two types of disorder existing in the packing. At about 190°C, a phase transition to a liquid crystalline columnar hexagonal packing (Dho) occurs. Finally, the sample melts into an isotropic amorphous phase. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 1727–1736, 1997