Synthesis and UV-curing behaviors of novel rapid UV-curable polyorganosilazanes

Kong, Jie; Fan, Xiaodong; Zhang, Guobin; Xie, Xiao; Si, Qingfa; Wang, Shengjie

doi:10.1016/j.polymer.2006.01.007

Cited by 48 publications

(42 citation statements)

References 18 publications

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“…On the other hand, two weak peaks characteristic of the Si-CH 3 and C CH 2 groups appeared at about −1 and 68 ppm, respectively. [29] Some other peaks were observed but with very low intensity. This is due to the difficulty of totally dissolving the yttrium acetate and the silylated yttrium acetate in the same solvent.…”

Section: Silylation Of Yttrium Triacetatementioning

confidence: 98%

“…1 H, 13 C and 29 Si high-resolution solid-state NMR (MAS for magic angle spinning) were carried out at room temperature on a Bruker Avance 400 (9.4 T) spectrometer (CEMHTI, Orleans, France) using a 4 mm MAS probe-head, operating at 400 MHz for 1 H and 100.6 MHz for 13 C. The 13 C{ 1 H} cross-polarization (CP) MAS NMR spectra were recorded at a spinning frequency of 14 kHz using a ramped cross-polarization [21] with a contact time of 1 ms and a recycle delay of 5 s. 1 H decoupling was achieved using the SPINAL-64 sequence [22] with a 1 H nutation frequency of about 60 kHz. Quantitative MAS spectra were acquired (with and without 1 H decoupling) using a single pulse of 0.5 µs duration (π /12) and recycle delays of 2 s. 1 H, 13 C and 29 Si chemical shifts are referred to (TMS) SiMe 4 solution.…”

Section: Nmr and Ftir Spectroscopymentioning

confidence: 99%

“…Quantitative MAS spectra were acquired (with and without 1 H decoupling) using a single pulse of 0.5 µs duration (π /12) and recycle delays of 2 s. 1 H, 13 C and 29 Si chemical shifts are referred to (TMS) SiMe 4 solution. All MAS NMR spectra were modelled using the Dmfit program.…”

Section: Nmr and Ftir Spectroscopymentioning

confidence: 99%

“…The combination of 13 C and 29 Si NMR with FTIR spectroscopy may be helpful to validate the hypothesis of Si incorporation in the product. The hydrated yttrium acetate and the silylated yttrium acetate were characterized by 13 C NMR in CD 3 OD solution at 300 K. In the hydrated yttrium acetate a first peak corresponding to the primary carbon in the C-CH 3 group (24 ppm) and a second peak attributed to the secondary carbon in the O-C(O)-CH 3 group (185 ppm) were observed.…”

Section: Silylation Of Yttrium Triacetatementioning

confidence: 99%

“…In this context, an original route has been defined by introducing yttrium and oxygen elements or yttrium and nitrogen elements into hexamethyldisilazane (HMDS) or tetramethydisiloxane (TMDSO) solution, respectively. The characterization of the different reaction products has been achieved using FTIR and solid and liquid state 1 H, 13 C, 29 Si NMR spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Two synthesis routes of organometallic precursors for the elaboration of SiCNYO pre‐alloyed nanopowders

Chehaidi

Foucaud

Maı̂tre

et al. 2010

Applied Organom Chemis

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International audienceTwo routes were simultaneously investigated to prepare organometallic precursors. They were characterized by NMR and FTIR techniques. In the first route, yttrium acetate was silylated by trimethylchlorosilane before its dissolution in hexamethydisilazane. That leads to a liquid precursor containing Si–C–N–Y–O–H elements. In the second route, a precursor with the same elements was elaborated by dissolution of an amminolysed yttrium compound in tetramethyldisiloxane. The amminolysed yttrium compound was obtained through the amminolysis of the yttrium trichloride by triethylamine [N(C2H5)3]

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Section: Silylation Of Yttrium Triacetatementioning

confidence: 98%

Section: Nmr and Ftir Spectroscopymentioning

confidence: 99%

Section: Nmr and Ftir Spectroscopymentioning

confidence: 99%

Section: Silylation Of Yttrium Triacetatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Two synthesis routes of organometallic precursors for the elaboration of SiCNYO pre‐alloyed nanopowders

Chehaidi

Foucaud

Maı̂tre

et al. 2010

Applied Organom Chemis

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Synthesis, characterization, and UV curing kinetics of hyperbranched polycarbosilane

Wang¹,

Fan²,

Kong³

et al. 2007

J of Applied Polymer Sci

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Hyperbranched polycarbosilane with allyl end groups was synthesized via hydrosilylation of methyldiallyldilane, and characterized by Fourier transform infrared spectroscopy, 1 H, 13 C, 29 Si nuclear magnetic resonance, and size exclusion chromatography/multiangle laser light scattering. The degree of branching and average number of branches of the resulted polymer determined by 29 Si NMR spectroscopy is 0.58 and 0.42, and the exponent a in Mark-Houwink equation is 0.33 based on the relationship between viscosity and molecular weight. UV curing behaviors of the hyperbranched polycarbosilane were investigated using differential scanning photocalorimeter, and the effects of diluent's concentration, light intensity, reaction atmosphere, and temperature on the curing behaviors and kinetics were studied in detail. It was found that curing reaction can be accomplished rapidly under UV irradiation within 40 s both in air and in nitrogen atmosphere if acrylic reactive diluent was employed. The result suggests that it is an effective way to increase the curing reactivity by incorporating acrylic reactive diluents with high UV sensitivity into the polycarbosilane system.

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Synthesis and FTIR spectroscopic investigation of the UV curing kinetics of telechelic urethane methacrylate crosslinkers based on the renewable resource—Cardanol

Rekha

Asha

2008

J of Applied Polymer Sci

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UV curable telechelic urethane-methacrylate crosslinkers based on the natural resource-cardanol was synthesized in a one pot synthetic step involving end capping of isophorone diisocyanate with one equivalent of hydroxyethyl methacrylate followed by condensation with cardanol. The structures of the resins were characterized by 1 H and 13 C NMR, fourier transform infrared (FTIR) and Matrix-assisted laser desorption/ionization time of flight (MALDI-TOF) spectroscopies and size exclusion chromatography (SEC). The curing process and double bond conversion in presence of 2,2-diethoxy acetophenone as photoinitiator upon UV irradiation was followed by Fourier transform infrared spectroscopy. These hydrogen bonded crosslinkers based on cardanol and its derivatives had higher double bond conversion when compared to a nonhydrogen bonding standard such as hexanediol diacrylate (HDDA) under identical conditions. The temperature effects on the hydrogen bonding were investigated, and a decrease in the extent of double bond conversion with increase in temperature was observed for the telechelic urethane-methacrylate crosslinkers whereas a steady increase in the curing rate was observed for HDDA. This gives direct indication of the influence of hydrogen bonding on the curing process.

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Synthesis and UV-curing behaviors of novel rapid UV-curable polyorganosilazanes

Cited by 48 publications

References 18 publications

Two synthesis routes of organometallic precursors for the elaboration of SiCNYO pre‐alloyed nanopowders

Two synthesis routes of organometallic precursors for the elaboration of SiCNYO pre‐alloyed nanopowders

Synthesis, characterization, and UV curing kinetics of hyperbranched polycarbosilane

Synthesis and FTIR spectroscopic investigation of the UV curing kinetics of telechelic urethane methacrylate crosslinkers based on the renewable resource—Cardanol

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