Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Kunio Oka"'
Publikováno v:
Crystal Growth & Design. 7:1078-1085
We report the polymerization mechanism and kinetics of muconic esters as the 1,3-diene monomers during solid-state polymerization via a crystal-to-crystal transformation. We have revealed a change in the structure of the muconate crystals accompanyin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::29efbb823c7854040624628d62697be0
https://doi.org/10.1021/cg0606444
https://doi.org/10.1021/cg0606444
Autor:
Masaki Nishioka, Hiroshi Mabuchi, Takashi Iseki, Kiyohito Okamura, Takaaki Dohmaru, Masaki Narisawa, Kazuya Shimoda, Kunio Oka
Publikováno v:
Journal of the Ceramic Society of Japan. 114:511-516
A melt-spinnable precursor for SiC based fibers was prepared from blend polymers of polycarbosilane (PCS) and polymethylsilane (PMS). After melt spinning, thermal oxidation curing, and pyrolysis, Si-C-O fibers were obtained. The addition of a small a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9eeb95cbb52f63dbcaf4f93259785a9d
https://doi.org/10.2109/jcersj.114.511
https://doi.org/10.2109/jcersj.114.511
Publikováno v:
Synthesis. :1479-1490
We have successfully controlled the stereochemical structure of diene polymers during radical polymerization in the solid state under UV and γ-ray radiation. The polymerization of the substituted benzyl muconates occurredvia a crystal lattice contro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::82575d64196006aba10aefa35890871c
https://doi.org/10.1055/s-2005-865320
https://doi.org/10.1055/s-2005-865320
Publikováno v:
Journal of the American Ceramic Society. 86:227-233
The pyrolysis of polymethylsilane (PMS) in an argon gas environment with a flow rate of 1 L/min was investigated as a standard pyrolytic process, and the investigation showed SiSi network formation at 573 K. Subsequently, various condensed PMS resins
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::201b9c66bdbe56ec037dc60981be108f
https://doi.org/10.1111/j.1151-2916.2003.tb00004.x
https://doi.org/10.1111/j.1151-2916.2003.tb00004.x
Publikováno v:
Chemistry of Materials. 13:4163-4169
Reflux-treated poly(methylsilane) (PMS) at 420−570 K improves its ceramic yield dramatically. This efficient process was investigated by TG, GC, 29Si, 13C, and 1H NMR, and FT-IR methods. The structural transformation process of the PMS polymer cons
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4642df74a5cd7b83bb8458b2a10bb486
https://doi.org/10.1021/cm000744b
https://doi.org/10.1021/cm000744b
Autor:
Yoshikazu Hayashi, Shoji Furukawa, Tatsuo Ogawa, Robert West, Toshinobu Kanai, Kunio Oka, Hiroki Ishibashi, Takaaki Dohmaru
Publikováno v:
Journal of Polymer Science Part B: Polymer Physics. 39:1085-1092
The thermochromic behavior of poly(di-n-octylsilane) {[Si(C8H17)2]n; PDOS} was studied by ultraviolet (UV) absorption, differential scanning calorimetry, and X-ray diffraction measurements. The structure of PDOS in the low-temperature phase strongly
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::37eb0f0cf4d88968fe44c588bfdf2cfd
https://doi.org/10.1002/polb.1085
https://doi.org/10.1002/polb.1085
Publikováno v:
Journal of Organometallic Chemistry. 611:45-51
Polar polysilanes bearing ethereal side groups [{CH 3 Si(CH 2 ) m O(CH 2 CH 2 O) n CH 3 } x , m =3–5 and n =0–3}] were prepared and were found to be soluble in a wide range of polar solvents. UV spectroscopic behavior is highly dep
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::96cf82aab0e52e305da9bfd4a6e0b2f0
https://doi.org/10.1016/s0022-328x(00)00433-2
https://doi.org/10.1016/s0022-328x(00)00433-2
Autor:
Seishi Saragai, Toru Odani, Shinsuke Nakamoto, Kohji Tashiro, Akikazu Matsumoto, Kayoko Katayama, Kunio Oka
Publikováno v:
Macromolecules. 33:7786-7792
Diethyl (Z,Z)-muconate (EMU), di(benzylammonium) (Z,Z)-muconate, and its chloro-substituted derivatives are highly susceptive to γ-irradiation and polymerize in high yields in the crystalline state. γ-Radiation polymerization produces the same ster
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a8ad7a3800f8ae9472865fe1c1b1c983
https://doi.org/10.1021/ma9917038
https://doi.org/10.1021/ma9917038
γ-Ray Curing of Poly(methylsilane) and Poly(methylsilane−dimethylsilane) for Improved Ceramic Yields
Autor:
Kiyohito Okamura, Yoshiro Katase, Takeshi Yoshida, Takaaki Dohmaru, Kunio Oka, Takashi Iseki, Masaki Narisawa
Publikováno v:
Chemistry of Materials. 12:2686-2692
Poly(methylsilane) (PMS) and poly(methylsilane−dimethylsilane) copolymers (P(MS−DMS)) were synthesized by Wurtz type polycondensation reactions of methyldichlorosilane or methyldichlorosilane−dimethyldichlorosilane mixtures in toluene. The obta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be57a071055111ff93a8a94d78b6098b
https://doi.org/10.1021/cm0002564
https://doi.org/10.1021/cm0002564
Publikováno v:
SHINKU. 43:373-376
We prepared thin films from poly (methylphenilsilane) (PMPS) and poly (dimethylsilane) (PDMS) by eximer-laser ablation and characterized them as light-emitting material for electroluminescence. The deposited films were characterized by UV, PL (photol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3a5a05322c7b2892e545a0c81bf2519a
https://doi.org/10.3131/jvsj.43.373
https://doi.org/10.3131/jvsj.43.373