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Synthesis of Photobase Generators and Their Use for Design of Polymeric Photosensitive System
Tsunooka, Masahiro,Tachi, Hideki,Asakino, Kaori,Suyama, Kanji Korean Society of Photoscience 1999 Journal of Photosciences Vol.6 No.3
The use of O-carbamoyloximes as photobase generators was investigated. $\alpha$-Meth-ylbenzilydeneamino phenylcarbamate(2a) and $\alpha$-methyl benzilydeneamino cyclohexylcarbamate(2b) were prepared by the reaction of phenyl or cyclohexyl isocyanates with acetophenone oxime , respectively. Aniline, phenylhydrazine and N, N'-diphenylhydrazine were detected in thephotolysis of 2a and cyclohexylamine and cyclohexylhydrazine in the photolysis of 2b. A monomer having pendant carbamoyloxyimino groups (BGM) was prepared by the reaction fo methancryloyloxyethyl iocyanate with acetophenone oxime, and copolymerized with styrene. The BGM copolymer films turned insoluble on UV irradiation, and the degree of insolubilizationwas increased by post-baking. The photocrosslinking was thought to be due to coupling of resulting pendant aminyl radicals, and the thermal crosslinking was due to association of resulting amino and hydrazino groups by hydrogen bonding. The introduction of epoxy groups into polymer increased the degree of thermal crosslinking by post-baking.
Ohasto, Hitoshi,Tsunooka, Tsutomu,Ando, Minato,Ohishi, Yoshihiro,Miyauchi, Yasuharu,Kakimoto, Ken ichi The Korean Ceramic Society 2003 한국세라믹학회지 Vol.40 No.4
Millimeter-wave dielectric ceramics have been used like applications for ultrahigh speed wireless LAN because it reduces the resources of electromagnetic wave, and Intelligent Transport System (ITS) because of straight propagation wave. For millimeterwave, the dielectric ceramics with high quality factor (Q$.$f), low dielectric constant($\varepsilon$), and nearly zero temperature coefficient of resonant frequency ($\tau$) are needed. No microwave dielectric ceramics with these three properties exist except Ba(Mg$\_$1/3/Ta/sub1/3/)O$_3$ (BMT), which has a little high s: In this paper, alumina (Al$_2$O$_3$) and fosterite (Mg$_2$SiO$_4$), candidates for millimeter-wave applications, were studied with an objective to get high q$.$f and nearly zero $\tau$$\_$f/ For alumina ceramics, q$.$f more than 680,000 GHz was obtained but it was difficult to obtain nearly zero Qf. On the other hand, for forsterite ceramics, q$.$f was achieved from 10,000 GHz of commercial for sterite to 240,000 GHz of highly purified MgO and SiO$_2$ raw materials, and $\tau$$\_$f/ was reduced a few by adding TiO$_2$ with high positive $\tau$$\_$f/.
Synthesis of Forsterite with High Q and Near Zero TCf for Microwave/Millimeterwave Dielectrics
히토시오사토,Minato ANDO,Tsutomu TSUNOOKA 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.11
With the advent of ubiquitous age, the high quality dielectric materials have been required for the wireless communicationsavailable to the millimeterwave as well as microwave frequencies. The utilizable region for the frequency has been expanding tothe millimeter-wave region because of the shortage of radio frequency (RF) resources. These high frequencies would be expectedfor ultra high speed LAN, ETS and car anti-colision system on the intelligent transport system (ITS) and so on. Silicates aregood candidates for microwave/millimeterwave dielectrics, because of their low dielectric constant εr and high quality factor (HighQ). Forsterite (Mg2SiO4) is one of the silicates with low εr of 6.8 and Q·f of 240000 GHz.In this paper, we reviewed following three categories for synthesis of forsterite: (1) Synthesis of high Q forsterite(2) Adjust the temperature coefficient of resonant frequency TCf(3) Diffusion of SiO4- and Mg-ions on the formation of forsterite
Ohsato, Hitoshi,Ando, Minato,Tsunooka, Tsutomu The Korean Ceramic Society 2007 한국세라믹학회지 Vol.44 No.11
With the advent of ubiquitous age, the high quality dielectric materials have been required for the wireless communications available to the millimeterwave as well as microwave frequencies. The utilizable region for the frequency has been expanding to the millimeter-wave region because of the shortage of radio frequency (RF) resources. These high frequencies would be expected for ultra high speed LAN, ETS and car anti-collision system on the intelligent transport system (ITS) and so on. Silicates are good candidates for microwave/millimeterwave dielectrics, because of their low dielectric constant ${\epsilon}_r$ and high quality factor (High Q). Forsterite ($Mg_2SiO_4$) is one of the silicates with low ${\epsilon}_r$ of 6.8 and Q f of 240000 GHz. In this paper, we reviewed following three categories for synthesis of forsterite: (1) Synthesis of high Q forsterite (2) Adjust the temperature coefficient of resonant frequency $TC_f$ (3) Diffusion of $SiO_{4^-}$ and Mg-ions on the formation of forsterite.