JaLCDOI 10.18926/fest/11482
フルテキストURL 011_093_097.pdf
著者 木村 邦生| 山崎 慎一| Cassidy Patrick E.| Fitch John W| Venumbaka Sreenu R.|
抄録 Fluorine-containing poly(ether ketone)s was synthesized by the nucleophilic aromatic substitution reaction of 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane and 4,4'-bis(2,3,4,5,6-pentafluorobenzoyl) diphenyl ether in super-critical CO(2). Polymerizations were carried out at 80℃ for 6 hours under 5000 psi of CO(2) pressure, which was super-critical phase. Polymerization concentration was 0.5 g of polymer in 10 - 12 mL of CO(2). The polymer was not obtained in CO(2) due to the insolubility of both the potassium bisphenoxide and the polymer into CO(2). However, the polymer was formed by an addition of DMAc and NMP in CO(2), even though molecular weight was not so high. Very small amount of co-solvents which were immiscible with CO(2) was effective, and it was 1/20 - 1/25 amount of the solvent used in the conventional poly(ether ketone) synthesis. The polymerization mechanism was also discussed.
キーワード super-critical carbon dioxide plastics high performance environmentally benign
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2006-03-15
11巻
1号
開始ページ 93
終了ページ 97
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313564
JaLCDOI 10.18926/fest/11477
タイトル(別表記) Efficient Chain Extension Reaction of Poly (butylene terephthalate) by using Crystallization
フルテキストURL 012_167_171.pdf
著者 井原 誠司| 城間 弥| 山崎 慎一| 木村 邦生|
抄録 Plastics are quite important materials for not only industrial usages but also our daily life. Many plastics are difficult to reuse because they are susceptible to UV, hydrolysis and so on leading to the reduction of molecular weight. Among them, poly (butylenes terephthalate) (PBT) is a valuable materials prepared by polycondensation reaction, and PBT has the same limitation to reuse. Hence, efficient chain extension reaction for recovered PBT has been needed to improve the properties damaged by chain scission. In this study, new chain extension reaction had been examined by using crystallization as pre-treatment. Isothermal crystallization at 161℃ concentrated the chain end-groups on the surface of the crystals, and chain extension reaction at 210℃, which was lower than the melting temperature of PBT, enhanced the molecular weight significantly compared with the reaction over the melting temperature. It concluded that the pre-treatment of crystallization was favorable for the efficient chain extension reaction and this result provided the new technology for the effective reuse of the plastics.
キーワード Polyester material recycle crystallization chain extension reaction
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2007-03-15
12巻
1号
開始ページ 167
終了ページ 171
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002314029
JaLCDOI 10.18926/fest/11473
タイトル(別表記) Acceleration of Formation of Shish under Flow by Addition of Irregular Shaped Particles
フルテキストURL 012_157_160.pdf
著者 山崎 慎一| 若林 完爾| 水間 健太| 木村 邦生|
抄録 We have shown that the shish was formed from the oriented melt composed of the elongated chains caused by dust particles within the melt via bundle typed nucleation under flow with low shear rate (γ=5s(-1)). This implies that dust particles effectively cause the elongation of chains within the melt. In this work, we observed the crystallization of polypropylene added with irregular shaped particles under shear flow by means of polarizing optical microscope. We prepared various shaped particles such as confetti-like, spherical and rock-like. We found that the size and asymmetric shape of additive particles play an important role for the acceleration of formation of shish.
キーワード shish crystallization polypropylene shear flow elongation injection molding
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2007-03-15
12巻
1号
開始ページ 157
終了ページ 160
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313610