Functionalized poly(methylphenyl)silane: End group reactivity

A Cl ended poly(methylphenyl)silane is synthesized and analyzed by Si-29-NMR spectroscopy. The end groups are extremely reactive with small compounds as alcohols and amines. By this way, copolysilanes containing some nitrogen atoms can be synthesized. (C) 1996 John Wiley & Sons, Inc

Solution Properties of Poly(methylphenyl)silane

The solution properties of poly(methylphenyl)silane are studied in tetrahydrofuran at room temperature. Combined measurements by gel permeation chromatography (g.p.c.) and light scattering indicate that the absolute molecular-weight values of poly(methylphenyl)silane do not differ from the g.p.c. values obtained using a classical g.p.c. calibration with polystyrene standards. Some calculations are performed on the molecular-weight values using the theory of Yamakawa and Fujii. These results allow one to conclude that the behaviour in solution of poly(methylphenyl)silane can be described using a model based on rigid-rod-like elements involving about 40 Si atoms

Poly(methylphenyl)silane - the Molecular-weight Dependence of the Uv Absorption Maxima Wavelengths

The purpose of this paper is to provide a correlation between lambda(max) and molecular weight for poly(methylphenyl)silane by the use of fractionated samples and by on-line coupling of a GPC chromatograph with a u.v. diode-array detector

Si-29 nuclear magnetic resonance of poly(methylphenyl)silane

A Cl-terminated poly(methylphenyl)silane is synthesized and analyzed by Si-29-NMR spectroscopy. Assignments are proposed for the different peaks observed. A modification of the chemical shifts of the peaks relative to the main chain atoms is observed upon heating. From these experimental results and computational calculations on model compounds, the assignments of the three main peaks to configurationally different Si atoms are confirmed. (C) 1996 John Wiley & Sons, Inc

Synthesis and Characterization of Polymethylphenylsilane-polystyrene Block-copolymers

Block copolymers of polymethylphenylsilane (PMPS) and polystyrene (PS) have been successfully prepared by the condensation of alpha,omega-dichloro-polymethylphenylsilane with polystyryl-lithium. These new materials have been characterized by UV spectroscopy, Si-29-NMR, and size exclusion chromatography. These block copolymers show a good emulsifying activity to compatibilize blends of the two homopolymers (PMPS and PS)

Synthesis and characterization of new pyrrole-containing polysilanes

The syntheses of 'mixed' polysilanes of molecular weights 1400 less than or equal to M(W) less than or equal to 8000 composed of N-methyl-2,5-pyrrolylene, dimethylsilylene and tetramethyldisilylene units are described. Poly[(dimethylsilylen)-N-methyl-2,5-pyrrolylene] 3 was prepared from N-methyl-2,5-dibromopyrrole and dimethyldichlorosilane, and poly[(tetramethyldisilylen)-N-methyl-2,5-pyrrolylene] 5 was obtained by Wurtz polymerization of N-methyl-2,5-bis(dimethylchlorosilyl)pyrrole 4. The 'mixed' polysilanes were characterized by size exclusion chromatography and by H-1 and Si-29 nuclear magnetic resonance and infra-red spectroscopies. Copyright (C) 1996 Elsevier Science Ltd