{"title":"Polyaddition of Bifunctional Isoprene Prepolymer Terminated with Hydroxy Groups and Diisocyanates.","authors":"H. Kouzai, T. Mitsumata","doi":"10.1246/NIKKASHI.2002.409","DOIUrl":"https://doi.org/10.1246/NIKKASHI.2002.409","url":null,"abstract":"ヒドロキシ基を両末端に結合したイソプレンプレポリマーがナトリウム-ナフタレンを開始剤としてイソプレンの溶液重合を行って，まずリビングプレポリマーとし，さらに乾燥酸素を通じて約75%の収率で得られた．このプレポリマーの分子量は1300–1500であり，1分子当たりのヒドロキシ基数は2.0–2.15であった．また，このプレポリマーのジイソシアナートによる重付加について若干検討した．反応溶媒としては，アニソール以外にN,N-ジメチルホルムアミドとジメチルスルホキシドが使用できる．得られたポリマーは黄色のスポンジゴム状で，一般の有機溶媒には不溶である．また，ガラス転移温度は73–78 °Cであった．","PeriodicalId":19311,"journal":{"name":"Nippon Kagaku Kaishi","volume":"30 1","pages":"409-413"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91349704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-01-01DOI: 10.1246/NIKKASHI.2002.485
S. Nakayama, T. Terada, S. Kakita, Shinji Imai, M. Sakamoto
The perovskite oxide LaCoO3 was synthesized by three different preparative methods i.e., the calcination of a mixture of La2O3 and CoO (La–Co–O) and pyrolysis of a co-precipitated precursor (La–Co–ox), La2 (C2O4)3 · xH2O + CoC2O4 · yH2O, and a heteronuclear complex (La–Co–CN), La[Co(CN)6] · 5H2O. The obtained powders were characterized by thermogravimetric analysis, infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy and specific surface area measurements. The formation of LaCoO3 single phase is clearly recognized for La–Co–O, La–Co–ox and La–Co–CN at temperatures above 1000, 1200 and 600 °C, respectively. The nano-sized LaCoO3 powder was obtained at low temperatures by pyrolysis of La–Co–CN. The mean particle diameter of La–Co–CN calcined at 600 °C for 2 h was 72 nm.
采用La2O3与CoO的混合物(La - Co - o)煅烧、共沉淀前驱体(La - Co - ox) La2 (C2O4)3·xH2O + CoC2O4·yH2O和异核配合物(La - Co - CN) La[Co(CN)6]·5H2O三种不同的制备方法合成了钙钛矿氧化物LaCoO3。采用热重分析、红外光谱、粉末x射线衍射、扫描电镜和比表面积测量等方法对所得粉体进行了表征。La-Co-O、La-Co-ox和La-Co-CN分别在1000、1200和600℃以上的温度下形成LaCoO3单相。采用低温热解法制备了纳米级LaCoO3粉体。600℃煅烧2 h后的La-Co-CN平均粒径为72 nm。
{"title":"Perovskite Oxide LaCoO3 Prepared by Solid-state Reaction, Pyrolysis of a Co-Precipitated Precursor or Pyrolysis of a Heteronuclear Complex.","authors":"S. Nakayama, T. Terada, S. Kakita, Shinji Imai, M. Sakamoto","doi":"10.1246/NIKKASHI.2002.485","DOIUrl":"https://doi.org/10.1246/NIKKASHI.2002.485","url":null,"abstract":"The perovskite oxide LaCoO3 was synthesized by three different preparative methods i.e., the calcination of a mixture of La2O3 and CoO (La–Co–O) and pyrolysis of a co-precipitated precursor (La–Co–ox), La2 (C2O4)3 · xH2O + CoC2O4 · yH2O, and a heteronuclear complex (La–Co–CN), La[Co(CN)6] · 5H2O. The obtained powders were characterized by thermogravimetric analysis, infrared spectroscopy, powder X-ray diffraction, scanning electron microscopy and specific surface area measurements. The formation of LaCoO3 single phase is clearly recognized for La–Co–O, La–Co–ox and La–Co–CN at temperatures above 1000, 1200 and 600 °C, respectively. The nano-sized LaCoO3 powder was obtained at low temperatures by pyrolysis of La–Co–CN. The mean particle diameter of La–Co–CN calcined at 600 °C for 2 h was 72 nm.","PeriodicalId":19311,"journal":{"name":"Nippon Kagaku Kaishi","volume":"92 1","pages":"485-488"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76394556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2002-01-01DOI: 10.1246/NIKKASHI.2002.255
Yasuyuki Suzuki, Jun Li, Y. Maekawa, Masaru Yoshida, K. Maeyama, N. Yonezawa
The hydrophilic surface of poly(ethylene terephthalate) (PET) film, obtained by partial hydrolysis, was converted to hydrophobic one under dry air, saturated water vapor atmosphere, nitrogen, and vacuum at temperatures ranging from 0 to 80 °C. The hydrophilicity of the surface increased significantly faster under the saturated water vapor although it was the most hydrophilic in the examined conditions. From the dependence of the absolute temperature on the rate of hydrophilicity change for each storage condition, a discontinuous point at ca. 50 °C was observable only under the water vapor condition. This relation indicates that the appreciable acceleration of the hydrophilicity change on the surface under the hydrophilic condition might be resulted from the increase of the surface mobility due to the water adsorption on the PET surface.
{"title":"Conversion of Hydrophilic Surface of Poly(ethylene terephthalate) Film to Hydrophobic One under Hydrophilic Conditions.","authors":"Yasuyuki Suzuki, Jun Li, Y. Maekawa, Masaru Yoshida, K. Maeyama, N. Yonezawa","doi":"10.1246/NIKKASHI.2002.255","DOIUrl":"https://doi.org/10.1246/NIKKASHI.2002.255","url":null,"abstract":"The hydrophilic surface of poly(ethylene terephthalate) (PET) film, obtained by partial hydrolysis, was converted to hydrophobic one under dry air, saturated water vapor atmosphere, nitrogen, and vacuum at temperatures ranging from 0 to 80 °C. The hydrophilicity of the surface increased significantly faster under the saturated water vapor although it was the most hydrophilic in the examined conditions. From the dependence of the absolute temperature on the rate of hydrophilicity change for each storage condition, a discontinuous point at ca. 50 °C was observable only under the water vapor condition. This relation indicates that the appreciable acceleration of the hydrophilicity change on the surface under the hydrophilic condition might be resulted from the increase of the surface mobility due to the water adsorption on the PET surface.","PeriodicalId":19311,"journal":{"name":"Nippon Kagaku Kaishi","volume":"69 1","pages":"255-259"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83196887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Production of Taxol and Related Taxoids by Callus Culture of Taxus cuspidata.","authors":"Jun-ichi Sakai, M. Ando, T. Uchiyama, Hajime Fujisawa, M. Kitabatake, Kazuki Toyoizumi, K. Hirose","doi":"10.1246/NIKKASHI.2002.231","DOIUrl":"https://doi.org/10.1246/NIKKASHI.2002.231","url":null,"abstract":"再生可能資源として入手の容易な日本イチイ(Taxus cuspidata)を新規抗癌剤Taxol®(Paclitaxel)(1)ならびに1の関連タキソイドの供給源として検討するため，日本イチイから誘導したカルス(イチイ培養細胞)に着目し，カルスの誘導方法，安定した増殖培養条件，1ならびにその関連タキソイド類の分離，生産方法を検討した． その結果，イチイカルスの誘導および安定した増殖を示す培養条件を見いだし，その生産物の抽出，分離方法を詳細に検討することにより，Taxol(1)を含め1の生合成における中間段階と考えられるタキソイド合計10種類とアビエタン1種類を単離同定した．また，本カルスはイチイ樹皮の含有量に匹敵する1の生産(乾燥カルス基準で0.01%)と，低酸化度のタキソイドTaxuyunnanine C(2)を始めとするその14位同族アシル化体3–6を極めて高い収率(乾燥カルス基準で総計0.49%)で生産しており，この結果は1の本カルスによる生産の可能性ならびに1および1の修飾化合物へのタキサン骨格供給源としての可能性を示唆する．","PeriodicalId":19311,"journal":{"name":"Nippon Kagaku Kaishi","volume":"4 1","pages":"231-238"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88527145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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