Poly(phenylsilsesquioxane)s: Structural and morphological characterization

Prado, L.; Radovanovic, Eduardo; Pastore, Heloise O.; Yoshida, Inez Valéria Pagotto; Torriani, Íris L.

doi:10.1002/(sici)1099-0518(20000501)38:9<1580::aid-pola22>3.0.co;2-7

Cited by 82 publications

(55 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…High power decoupling-magic angle spinning nuclear magnetic resonance of 29 Si and 13 C (HPDEC-MAS NMR) 29 Si and 13 C HPDEC-MAS NMR spectra were obtained at room temperature on a Bruker AC300/P spectrometer operating at 59.6 MHz for 29 Si and 75.5 MHz for 13 C. For the 29 Si nucleus the acquisition time was 50 ms, with a recycle delay of 20 s and a spectral width of 15 × 10 3 Hz. For the 13 C nucleus the acquisition time was 50 ms, with a recycle delay of 10 s and a spectral width of 26 × 10 3 Hz.…”

Section: 5mentioning

confidence: 99%

n-Propylpyridinium chloride-modified poly(dimethylsiloxane) elastomeric networks: Preparation, characterization, and study of metal chloride adsorption from ethanol solutions

Pissetti

Magosso

Yoshida

et al. 2007

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Section: 5mentioning

confidence: 99%

n-Propylpyridinium chloride-modified poly(dimethylsiloxane) elastomeric networks: Preparation, characterization, and study of metal chloride adsorption from ethanol solutions

Pissetti

Magosso

Yoshida

et al. 2007

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…According to the former study, 6 the two signals at δ 7.72 and 7.68 ppm are reasonably attributed to the symmetric ortho protons in the phenyl groups of T 3 Ph and T 2 Ph , respectively. The presence of T 3 Ph and T 2 Ph suggests that the primary hydrolysate PST underwent silanol coupling to produce oligomers during the hydrolysis and the following neutralization. The unit ratio of T 3 Ph calculated from their integral ratio was 75%.…”

Section: Formation Of the Tcp/tcm Co-hydrolysatementioning

confidence: 99%

“…[1][2][3] In general, PSQ can be obtained by the hydrolytic polycondensation of trifunctional monomers, RSiX 3 , where X can be a halide, an alkoxide, or a carboxylate. Their typical examples are poly(phenylsilsesquioxane) (PPSQ) and poly(methylsilsesquioxane) (PMSQ) that are synthesized from phenyltrichlorosilane (TCP) 4 and methyltrichlorosilane (TCM), 5 respectively.…”

mentioning

confidence: 99%

Formation of Stable Nanoparticles of Poly(phenyl/methylsilsesquioxane) in Aqueous Solution

Taniguchi

Miyamoto

et al. 2003

Polym J

View full text Add to dashboard Cite

ABSTRACT:Nanoparticles of poly(phenyl/methylsilsesquioxane) (PPMSQ) were prepared by emulsion polymerization of the co-hydrolysate that had been formed from a mixture of trichlorophenylsilane (TCP) and trichloromethylsilane (TCM) in aqueous solution. The average size of the resultant particles was controlled from 30 to 250 nm in diameter by changing the initial concentration of the co-hydrolysate and the amount of the emulsifier added. The PPMSQ formed from the hydrolysate of TCP/TCM had a high cross-linking density, being insoluble and stable in nature. The 1 H NMR spectrum of the co-hydrolysate revealed that both the primary hydrolysates of TCP and TCM are involved in the fast co-polycondensation to afford meta-stable water-soluble oligomers having many silanol groups. These oligomers are allowed to react with each other to form the nanoparticles with the aid of emulsifier.KEY WORDS Polysilsesquioxane / Nanoparticles / Emulsion Polymerization / Trichlorophenylsilane / Trichloromethylsilane / Polysilsesquioxanes (PSQ) with the formula of (RSiO 3/2 ) n are a family of silicone compounds having outstanding thermal stability and good electric insulating properies. [1][2][3] In general, PSQ can be obtained by the hydrolytic polycondensation of trifunctional monomers, RSiX 3 , where X can be a halide, an alkoxide, or a carboxylate. Their typical examples are poly(phenylsilsesquioxane) (PPSQ) and poly(methylsilsesquioxane) (PMSQ) that are synthesized from phenyltrichlorosilane (TCP) 4 and methyltrichlorosilane (TCM), 5 respectively. Recently, we reported that the hydrolysis of TCP in an aqueous/organic bilayer system produces monomeric phenylsilanetriol (PST) in the aqueous layer and that the KOH-catalyzed polycondensation of this PST in refluxing toluene gives rise to PPSQ with highly ordered ladder structure. 6,7 More recently, we conducted the polycondensation of the TCP hydrolysate in a refluxing toluene/water bilayer system with the aid of a phase transfer catalyst to obtain PPSQ in high yield without passing the isolation step of the TCP hydrolysate. 8 We also disclosed the preparation of nanoparticles of PPSQ having an average diameter of 30-110 nm by conducting the emulsion polymerization of the TCP hydrolysate after the addition of an emulsifier. 9 This was the first success in preparing the nanoparticles of PSQ.With increasing interest in designing micro-and nano-structured materials for industrial needs, many attempts have been made to obtain particles with suitable size and shape. 10,11 Minami et al., for example, prepared PPSQ particles with an average diameter of 0.2-1.0 µm and a relatively wide size distribution from organoalkoxysilane. They used these microparticles for preparing the thick films of PPSQ and applied as micro-optical devices. 12 Nota et al. prepared the PMSQ particles with an average diameter of 0.2-5.0 µm by emulsion polymerization of organoalkoxysilane. 13,14 Our former success in preparing the PPSQ nanoparticles has opened a new option in designing the nano-structured materials.The p...

show abstract

“…Polyphenylsilsesquioxane itself has a random, lad der, or cage structure. 10, 11 Here, we report the photocon ductivity and electro optic properties of the nanostruc tured composite at telecommunication wavelengths.…”

mentioning

confidence: 96%

Self-organised poly[(ethynediyl)(arylene)(ethynediyl)silylene]/N-ethylcarbazole/polyphenylsilsesquioxane hybrid nanomaterials: photoconductivity and electro-optic response at telecommunication wavelengths

et al. 2004

View full text Add to dashboard Cite

The photoconductivity and electro optic response of a self organised nanostructured poly[(ethynediyl)(arylene)(ethynediyl)silylene]/N ethylcarbazole/polyphenylsilsesquioxane composite have been investigated with a cw diode laser at a wavelength of 1500 nm. For electric field 25 V µm -1 and beam intensity 18 W cm -2 , the photosensitivity was 0.5 pS cm -1 (W cm -2 ) -1 . The dark conductivity was found to be much less than the photocon ductivity and the composite shows photo charge generation at this wavelength. The value of the composite electro optic coefficient is in agreement with data for polymeric materials active in the visible range. Orientational effects have been observed with modulation frequencies down to several Hz, and quite slow dynamics of the response can be expected.Poly[ethynediyl arylene ethynediyl silylene]s (PEAES) exhibit high third order nonlinear optical prop erties 1 and can be used as optical chromophores for photorefraction (PR) at 633 nm with fullerenes as charge generator. 2 We have also recently described novel organic PR composites, based on PEAES behaving as both opti cal chromophore and charge generator, active at the very important telecommunication wavelength 1500 nm. 3 The longest wavelengths at which organic PR materials have been previously demonstrated lie in the region 750-830 nm, 4 although inorganic materials 5 and also nanocomposites of inorganic nanocrystals in a poly mer matrix 6 active at telecommunication wavelengths have been described. The PR compositions made from PEAES/N ethylcarbazole (EC)/polyphenylsilsesquioxane undergo self organisation through π-π interactions be tween the aromatic groups of all three components giving nanostructured hybrid layered materials, thus accounting for the observed PR properties, in particular, the photo charge generation at 1500 nm even though the composi tion solution has an absorption edge at ca. 550 nm. 3 No tably, the self assembly occurs in the absence of any sur factant. Long range surfactant free ordering has been re ported recently for bridged silsesquioxanes X[SiO 1.5 ] n (n ≥ 2), 7,8 but to our knowledge it has not been observed previously for non bridged silsesquioxanes (n = 1) such as polyphenylsilsesquioxane although surfactant directed self assembly is well established, 9 and the use of an thracene based organogelators has recently been de scribed. Polyphenylsilsesquioxane itself has a random, lad der, or cage structure. 10,11 Here, we report the photocon ductivity and electro optic properties of the nanostruc tured composite at telecommunication wavelengths. Results and DiscussionThe PEAES polymer was synthesized by Pd catalysed cross coupling of diethynyldiphenylsilane with 9,10 di bromoanthracene (Scheme 1), the polymer chains con taining ca. 50 units. 12 The molecular structure consists of alternating donor anthracene 13-15 and acceptor Ph 2 Si 16

show abstract

Poly(phenylsilsesquioxane)s: Structural and morphological characterization

Cited by 82 publications

References 33 publications

n-Propylpyridinium chloride-modified poly(dimethylsiloxane) elastomeric networks: Preparation, characterization, and study of metal chloride adsorption from ethanol solutions

n-Propylpyridinium chloride-modified poly(dimethylsiloxane) elastomeric networks: Preparation, characterization, and study of metal chloride adsorption from ethanol solutions

Formation of Stable Nanoparticles of Poly(phenyl/methylsilsesquioxane) in Aqueous Solution

Self-organised poly[(ethynediyl)(arylene)(ethynediyl)silylene]/N-ethylcarbazole/polyphenylsilsesquioxane hybrid nanomaterials: photoconductivity and electro-optic response at telecommunication wavelengths

Contact Info

Product

Resources

About