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- 저자 : Junichi Hasegawa (검색결과 2 건)
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Polyimides Containing Benzoxazole Units and Their Liquid-Crystalline Behavior
Masatoshi Hasegawa,Takako Inoue,Ryo Miyauchi,Junichi Ishii 한국고분자학회 2018 Macromolecular Research Vol.26 No.10
Herein, we report the liquid-crystalline behavior of polyimides (PIs) containing benzoxazole (BO) units and their model compounds, and provide fundamental information in relation to their potential as heat-releasing materials. A series of BO-containing tetracarboxylic dianhydrides were synthesized using two bis(oaminophenol) s as starting materials, namely, 3,3′-dihydroxy-4,4′-diaminobiphenyl (p-HAB) and 4,6-diaminoresorcinol (DAR). When a p-HAB-type BO-containing tetracarboxylic dianhydride with ester linkages was combined with a siloxanediamine (amine equivalent: 430 g/mol), the resulting PI barely exhibited optical anisotropy with an unclear and undeveloped texture with the assistance of continuous shear stimulus. On the other hand, the combination of DAR-type BO-containing tetracarboxylic dianhydride with ester linkages and the siloxanediamine led to the formation of an optically anisotropic texture with particle-like domains in the heating process over a wide temperature range, although continuous shear stimulus in the molten state was still required for this system. The thermal diffusivity of BOcontaining PI films quenched from their liquid-crystalline states is also reported.
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Chizu Kameda,Hideaki Miwa,Ryohei Kawabata,Daiki Marukawa,Masahiro Murakami,Shingo Noura,Junzo Shimizu,Junichi Hasegawa 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.4
An inflammatory fibroid polyp (IFP) is a mesenchymal tumor of the gastrointestinal tract. IFPs in the small intestine are the mostfrequently detected with symptoms, such as abdominal pain and tarry stool due to intussusception. Accordingly, few studies havereported jejunal IFP as a cause of occult gastrointestinal bleeding (OGIB) diagnosed via both of capsule endoscopy (CE) and doubleballoonenteroscopy (DBE). A 68-year-old woman presented with a progression of anemia and a positive fecal occult blood test result. Esophagogastroduodenoscopy and total colonoscopy findings were unremarkable. CE revealed a tumor with bleeding in the jejunum. DBE also revealed a jejunal polypoid tumor. Bleeding from the tumor seemed to have caused anemia. The patient underwent partiallaparoscopic resection of the jejunum, including resection of the tumor. The tumor was histopathologically diagnosed as IFP. To ourknowledge, this is the first reported case of laparoscopic resection of jejunal IFP with OGIB diagnosed via CE and DBE preoperatively.
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