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SUBSTITUENT EFFECTS OF tert-BUTYL GROUPS ON FLUORENYL LIGAND OF [t-BuNSiMe2Flu] ZrMe2

Chinese Journal of Polymer Science 2008年第5期26卷 575-578页

作者： yuushou nakayama Takeshi Shiono Department of Applied Chemistry Graduate School of EngineeringHiroshima UniversityHigashi-Hiroshima 739-8527Japan

[t-BuNSiMe_2(2,7-t-Bu_2Flu)]ZrMe_2 and[t-BuNSiMe_2(3,6-t-Bu_2Flu)]ZrMe_2 were synthesized,and the solid structure of complex[t-BuNSiMe_2(2,7-t-Bu_2Flu)]ZrMe_2 was elucidated by single crystal X-ray *** complexes were applied for propylene polymerization using dried modified methylaluminoxane as a cocatalyst at 0℃and 20℃in *** systems did not show activity at 0℃,but they conducted the polymerization at 20℃.The introduction of t-butyl substituents to the fluorenyl ligand improved the activ...

关键词： Single-site catalyst Zirconium complex Propylene Polymerization Syndiospecificity.

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Supercritical Fluid Impregnation of Essential Bark Oil in Copolymers of L-Lactide with 7-Membered Cyclic Compounds

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Journal of Biomaterials and Nanobiotechnology 2014年第3期5卷 159-172页

作者： Chikara Tsutsumi Teruyuki Hara Yuka Ueno yuushou nakayama Takeshi Shiono Department of Applied Chemistry and Biotechnology Niihama National College of Technology NiihamaJapan Department of Applied Chemistry Graduate School of Engineering Hiroshima University Higashi-Hiroshima Japan

In order to develop a novel controlled-release material, we previously attempted to impregnate poly(L-lactide) (poly(L-LA)), poly(L-LA-ran-CL) (CL: ε-caprolactone) or poly(L-LA-ran-TEMC) (TEMC: tetramethylene carbonate) with low boiling point, organic useful compounds using supercritical carbon dioxide (scCO2) as the solvent. In this work, the factors influencing impregnation of poly (L-LA) random copolymers with useful compounds were investigated under scCO2 using the copolymers previously used. The influence of temperature, pressure, and time on the impregnation contents of the useful compounds on the copolymers was evaluated. The polymer used, which is a base of this material, was poly(L-LA-ran-CL), poly(L-LA-ran-TEMC), or poly(L-LA-ran-DXO) (DXO: 1,5-dioxepan-2-one). Statistical random copolymers of L-LA with CL, TEMC, or DXO were synthesized using Sn(oct)2 as a catalyst at 150°C for 24 h without solvent. Preparation of the controlled-release materials was carried out using essential bark oil from Thujopsis dolabrata var. hondae and synthetic L-LA random copolymers as a base material under scCO2. The impregnation experiment, which investigated the influence of pressure, was conducted in the range of 10 to 20 MPa. The influence of temperature on impregnation was carried out at 40°C to 100°C. Impregnation time was varied from 1 to 5 h. The pressure of essential oil impregnated into poly(L-LA) random copolymers was the highest at 14 MPa. In the influence of temperature on impregnation, the amount of essential oil increased with increasing temperature.

关键词： Biodegradable Polyester L-Lactide Copolymer Supercritical Carbon Dioxide Impregnation

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