{"title":"Synthesis and Properties of Stereoblock Copolymers Composed of Lactide and ε-Caprolactone","authors":"Y. Nakayama, T. Uno, T. Shiono, H. Shirahama","doi":"10.1295/KORON.2018-0044","DOIUrl":"https://doi.org/10.1295/KORON.2018-0044","url":null,"abstract":"","PeriodicalId":17878,"journal":{"name":"Kobunshi Ronbunshu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86705962","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}
Takeyama Yoshihisa, M. Ueno, M. Uejima, H. Fujiwara, S. Nishimura
{"title":"Development of Carbon Nanotube/Rubber Composite Materials with Excellent High Pressure Hydrogen Characteristics","authors":"Takeyama Yoshihisa, M. Ueno, M. Uejima, H. Fujiwara, S. Nishimura","doi":"10.1295/KORON.2019-0008","DOIUrl":"https://doi.org/10.1295/KORON.2019-0008","url":null,"abstract":"","PeriodicalId":17878,"journal":{"name":"Kobunshi Ronbunshu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76157447","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}
Hirokazu Yano, M. Nishiyama, Sadayoshi Hayashi, K. Kudo, H. Okuzaki
{"title":"Synthesis and Characterization of a Novel Self-Doped Water-Soluble Conducting Polymer","authors":"Hirokazu Yano, M. Nishiyama, Sadayoshi Hayashi, K. Kudo, H. Okuzaki","doi":"10.1295/KORON.2018-0022","DOIUrl":"https://doi.org/10.1295/KORON.2018-0022","url":null,"abstract":"","PeriodicalId":17878,"journal":{"name":"Kobunshi Ronbunshu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85224016","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}
Daisuke Takeuchi, Shigenaga Takano, Yuriko Chiba, T. Iwamura, K. Osakada
Dinuclear complex catalysts often show different catalytic bahavior compared to the corresponding mononulcear complex catalysts. Most of the previously reported dinuclear catalysts contain two mononuclear complexes connected by a fl exible tether. Herein we report double - decker type dinuclear complex catalysts having two metal centers located on cyclic ligands in close proximity. They show a higher catalytic activity than the mononuclear analogue, and gave polymers with higher molecular weight. The dinuclear catalysts also promote copolymerization of ole fi ns with various comonomers and gave copolymers with unique structures. It was also revealed that the dinuclear catalysts are stable at elevated temperature.
{"title":"Polymerization and Copolymerization of Olefins by Double-Decker Type Dinuclear Metal Complex Catalysts","authors":"Daisuke Takeuchi, Shigenaga Takano, Yuriko Chiba, T. Iwamura, K. Osakada","doi":"10.1295/KORON.2018-0030","DOIUrl":"https://doi.org/10.1295/KORON.2018-0030","url":null,"abstract":"Dinuclear complex catalysts often show different catalytic bahavior compared to the corresponding mononulcear complex catalysts. Most of the previously reported dinuclear catalysts contain two mononuclear complexes connected by a fl exible tether. Herein we report double - decker type dinuclear complex catalysts having two metal centers located on cyclic ligands in close proximity. They show a higher catalytic activity than the mononuclear analogue, and gave polymers with higher molecular weight. The dinuclear catalysts also promote copolymerization of ole fi ns with various comonomers and gave copolymers with unique structures. It was also revealed that the dinuclear catalysts are stable at elevated temperature.","PeriodicalId":17878,"journal":{"name":"Kobunshi Ronbunshu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80184430","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}
R. Tanaka, Takayuki Yamashita, Naoki Tonoko, Y. Nakayama, T. Shiono
The effects of phenols and silanols as a modi fi er of trialkylaluminum - depleted modi fi ed methylaluminoxane ( dMMAO ) were investigated in the living propylene polymerization using fl uorenylamido - ligated titanium complex – dMMAO catalyst system. The addition of phenols with electron withdrawing groups increased the turnover frequency ( TOF ) of the catalyst, while the addition of non - substituted phenol and monosilanol had a negative effect on the TOF. These results indicate that the Lewis acidity of aluminoxane was enhanced by the modi fi cation with electron de fi cient phenoxides. The decrease of the stereoregularity of the obtained polypropylene accompanied by the increase of TOF supported this interpretation. These fi ndings could be extended to explain the cocatalytic behavior of MMAO supported onto silica.
{"title":"Effect of Added Phenols and Silanol on the Cocatalyst Activity of Methylaluminoxane","authors":"R. Tanaka, Takayuki Yamashita, Naoki Tonoko, Y. Nakayama, T. Shiono","doi":"10.1295/KORON.2018-0024","DOIUrl":"https://doi.org/10.1295/KORON.2018-0024","url":null,"abstract":"The effects of phenols and silanols as a modi fi er of trialkylaluminum - depleted modi fi ed methylaluminoxane ( dMMAO ) were investigated in the living propylene polymerization using fl uorenylamido - ligated titanium complex – dMMAO catalyst system. The addition of phenols with electron withdrawing groups increased the turnover frequency ( TOF ) of the catalyst, while the addition of non - substituted phenol and monosilanol had a negative effect on the TOF. These results indicate that the Lewis acidity of aluminoxane was enhanced by the modi fi cation with electron de fi cient phenoxides. The decrease of the stereoregularity of the obtained polypropylene accompanied by the increase of TOF supported this interpretation. These fi ndings could be extended to explain the cocatalytic behavior of MMAO supported onto silica.","PeriodicalId":17878,"journal":{"name":"Kobunshi Ronbunshu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82314604","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":"Analysis of Molecular-level Conditions in Polymer Systems by Using a Pulse-Induced Dynamic Compression ATR Infrared Step Scan Time Resolved FT-IR. Part 1—Basic Simulation Study Based on a Fresnel Multiple Reflection Model—","authors":"Yuji Nishikawa, Hiroto Itoh, I. Noda, T. Hasegawa","doi":"10.1295/koron.2018-0016","DOIUrl":"https://doi.org/10.1295/koron.2018-0016","url":null,"abstract":"","PeriodicalId":17878,"journal":{"name":"Kobunshi Ronbunshu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77344683","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}
Sosuke Kudo, Miru Hirahara, H. Ogihara, H. Kurokawa
{"title":"Polyethylene Blend Prepared by Ethylene or Ethylene/1-Hexene Polymerization Using Ni(II) and Fe(III) Complexes Immobilized into Fluorotetrasilicic Mica Interlayer as Catalyst","authors":"Sosuke Kudo, Miru Hirahara, H. Ogihara, H. Kurokawa","doi":"10.1295/KORON.2018-0026","DOIUrl":"https://doi.org/10.1295/KORON.2018-0026","url":null,"abstract":"","PeriodicalId":17878,"journal":{"name":"Kobunshi Ronbunshu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86196252","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}
K. Nishii, Shigetaka Hayano, Y. Tsunogae, Y. Nakayama, T. Shiono
{"title":"Synthesis of ansa-Fluorenylamidotitanium(tetrahydrofuran) Complex and Its Catalytic Ability for Polymerization of Olefins","authors":"K. Nishii, Shigetaka Hayano, Y. Tsunogae, Y. Nakayama, T. Shiono","doi":"10.1295/koron.2018-0021","DOIUrl":"https://doi.org/10.1295/koron.2018-0021","url":null,"abstract":"","PeriodicalId":17878,"journal":{"name":"Kobunshi Ronbunshu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73102662","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":"Attractive Interactions in Olefin Polymerization—Controlled Chain Transfer","authors":"H. Terao, T. Nakano, S. Ishii, T. Fujita","doi":"10.1295/KORON.2018-0028","DOIUrl":"https://doi.org/10.1295/KORON.2018-0028","url":null,"abstract":"","PeriodicalId":17878,"journal":{"name":"Kobunshi Ronbunshu","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73575279","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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