A New Polycondensation Process for the Preparation of Polysiloxane Copolymers

Melt copolymerization reactions of several bis(diethylamino)silane derivatives, bis(diethylamino)methylphenylsilane, bis(diethylamino)methyloctylsilane, 1,2-bis(diethylamino)tetramethyldisilane, and 1,3-bis(diethylamino)tetramethyldisiloxane, with 2,7-dihydroxyfluoren-9-one were carried out to yield poly[oxy(2,7-fluoren-9-onenylene)oxy(diorganosilylene)]s bearing the fluoren-9-one fluorescent aromatic group in the polymer main chain: poly[oxy(2,7-fluoren-9-onenylene)oxy(methylphenylsilylene)], poly[oxy(2,7-fluoren-9-onenylene)oxy(methyloctylsilylene)], poly[oxy(2,7-fluoren-9-onenylene)oxy(tetramethyldisilylene)], and poly[oxy-(2,7-fluoren-9-onenylene)oxy(tetramethyldisiloxanylene)]. These polymeric materials are soluble in common organic solvents such as CHCl 3 and THF. FTIR spectra of all the materials reveal characteristic Si-O-C stretching frequencies at 1012-1018 cm −1 . In the THF solution, the prepared materials show strong maximum absorption peaks at 258-270 nm, strong maximum excitation peaks at 260-280 nm, and strong maximum fluorescence emission bands at 310-420 nm. TGA thermograms suggest that most of the polymers are essentially stable to 200 °C without any weight loss and up to 300 °C with only a weight loss of less than 5% in nitrogen.

mentioning

confidence: 99%

Synthesis and Photoelectronic Properties of Thermally Stable Poly[oxy(2,7-fluoren-9-onenylene)oxy(diorganosilylene)]s

Jung¹,

Park²

2012

“…For instance, a new type of polymerization involving the polycondensation of dihydrosilanes with dialkoxysilanes was reported at or below room temperature in the presence of catalytic amounts of tris(pentafluorophenyl)borane to produce a wide variety of hybrid polysiloxanes with elimination of a hydrocarbon as a byproduct. 16 The condensation of a dichlorosilane with a silanediol in the presence of triethylamine was reported to readily yield alternating cyclotetrasiloxanes, which then might be ring-opened to produce linear polysiloxanes.…”

Section: 14mentioning

confidence: 99%

Synthesis and Properties of Poly[oxy(arylene)oxy(tetramethyldisilylene)]s via Melt Copolymerization Reaction

Jung¹,

Park²

2013

We carried out the melt copolymerization reactions of 1,2-bis(diethylamino)tetramethyldisilane with several aryldiols such as, 4,4'-biphenol, 4,4'-isopropylidenediphenol, 9H-fluoren-9,9-dimethanol, and 4,4'-(9-fluorenylidene)bis(2-phenoxyethanol) to afford poly[oxy(arylene)oxy(tetramethyldisilylene)]s containing fluorescent aromatic chromophore groups in the polymer main chain: poly[oxy(4,4'-biphenylene)oxy(tetramethyldisilylene)], poly[oxy{(4,4'-isopropylidene) diphenylene}oxy(tetramethyldisilylene)], poly[oxy(9H-fluorene-9,9-dimethylene)oxy(tetramethyldisilylene)], and poly[oxy{4,4'-(9-fluorenylidene)bis(2-phenoxyethylene)}oxy(tetramethyldisilnylene)]. These prepared materials are soluble in common organic solvents such as CHCl 3 and THF. The obtained polymers were characterized by several spectroscopic methods such as . These polymeric materials in THF showed strong maximum absorption peaks at 268-281 nm, strong maximum excitation peaks at 263-291 nm, and strong maximum fluorescence emission bands at 314-362 nm due to the presence of tetramethyldisilylene and several arylene chromophores in the polymer main chain. TGA thermograms indicated that most of the polymers were stable up to 200 °C with a weight loss of 3-16% in nitrogen.

“…In order to synthesize linear poly(carbotetramethyldisiloxane)s with high molecular weights, we attempted to carry out the melt copolymerization of 2 with several aryldiols. The materials produced were characterized using FTIR, 1 H, 13 …”

Section: 22mentioning

confidence: 99%

“…For example, a new type of polymerization involving the polycondensation reaction of dihydrosilanes with dialkoxysilanes was reported at or below room temperature in the presence of very low levels of B(C 6 F 5 ) 3 to yield hybrid polysiloxanes with the elimination of hydrocarbon as a byproduct. 13 The condensation of a dichlorosilane with a silanediol in the presence of triethylamine was reported to readily yield alternating cyclotetrasiloxanes.…”

mentioning

confidence: 99%

Melt Copolymerization Reactions between 1,3-Bis(diethylamino)tetramethyldisiloxane and Aryldiol Derivatives

Jung¹,

Park²

2011

Melt copolymerization reactions of bis(diethylamino)tetramethyldisiloxane with several aryldiols were carried out to afford poly(carbotetramethyldisiloxane)s containing fluorescent aromatic chromophore groups in the polymer main chain: poly{oxy(4,4'-biphenylene)oxytetramethyldisiloxane}, poly{oxy(1,4-phenylene)oxytetramethyldisiloxane}, poly[oxy{(4,4'-isopropylidene)diphenylene}oxytetramethyldisiloxane], poly[oxy{(4,4'-hexafluoroisopropylidene)diphenylene}oxytetramethyldisiloxane], poly{oxy(2,6-naphthalene)oxytetramethyldisiloxane}, poly[oxy{4,4'-(9-fluorenylidene)diphenylene}oxytetramethyldisiloxane], poly{oxy(fluorene-9,9-dimethylene)oxytetramethyldisiloxane}, and poly[oxy{4,4'-(9-fluorenylidene)bis(2-phenoxyethylene)}oxytetra-methyldisiloxane]. These materials are soluble in common organic solvents such as CHCl 3 and THF. The FTIR spectra of all the polymers exhibit the characteristic Si-O-C stretching frequencies at 1021-1082 cm −1 . In the THF solution, the polymeric materials show strong maximum absorption peaks at 215-311 nm, with strong maximum excitation peaks at 250-310 nm, and strong maximum fluorescence emission bands at 310-360 nm. TGA thermograms indicate that most of the polymers are stable up to 200 o C with a weight loss of less than 10% in nitrogen.