start-ver=1.4 cd-journal=joma no-vol=11 cd-vols= no-issue=1 article-no= start-page=93 end-page=97 dt-received= dt-revised= dt-accepted= dt-pub-year=2006 dt-pub=20060315 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=New Attempt at Preparation of Fluorine-containing Poly(ether ketone)s in Supercritical Carbon Dioxide en-subtitle= kn-subtitle= en-abstract= kn-abstract=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. en-copyright= kn-copyright= en-aut-name=KimuraKunio en-aut-sei=Kimura en-aut-mei=Kunio kn-aut-name=木村邦生 kn-aut-sei=木村 kn-aut-mei=邦生 aut-affil-num=1 ORCID= en-aut-name=YamazakiShinichi en-aut-sei=Yamazaki en-aut-mei=Shinichi kn-aut-name=山崎慎一 kn-aut-sei=山崎 kn-aut-mei=慎一 aut-affil-num=2 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=CassidyPatrick E. kn-aut-sei=Cassidy kn-aut-mei=Patrick E. aut-affil-num=3 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=FitchJohn W kn-aut-sei=Fitch kn-aut-mei=John W aut-affil-num=4 ORCID= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=VenumbakaSreenu R. kn-aut-sei=Venumbaka kn-aut-mei=Sreenu R. aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=Institute for Environmental and Industrial Science, Texas State University at San Marcos affil-num=4 en-affil= kn-affil=Institute for Environmental and Industrial Science, Texas State University at San Marcos affil-num=5 en-affil= kn-affil=Institute for Environmental and Industrial Science, Texas State University at San Marcos en-keyword=super-critical carbon dioxide kn-keyword=super-critical carbon dioxide en-keyword=plastics kn-keyword=plastics en-keyword=high performance kn-keyword=high performance en-keyword=environmentally benign kn-keyword=environmentally benign END start-ver=1.4 cd-journal=joma no-vol=12 cd-vols= no-issue=1 article-no= start-page=167 end-page=171 dt-received= dt-revised= dt-accepted= dt-pub-year=2007 dt-pub=20070315 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Efficient Chain Extension Reaction of Poly (butylene terephthalate) by using Crystallization kn-title=結晶化処理を用いたポリブチレンテレフタレートの効果的鎖延長反応の開発 en-subtitle= kn-subtitle= en-abstract= kn-abstract=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. en-copyright= kn-copyright= en-aut-name=IharaSeiji en-aut-sei=Ihara en-aut-mei=Seiji kn-aut-name=井原誠司 kn-aut-sei=井原 kn-aut-mei=誠司 aut-affil-num=1 ORCID= en-aut-name=ShiromaHisashi en-aut-sei=Shiroma en-aut-mei=Hisashi kn-aut-name=城間弥 kn-aut-sei=城間 kn-aut-mei=弥 aut-affil-num=2 ORCID= en-aut-name=YamazakiShinichi en-aut-sei=Yamazaki en-aut-mei=Shinichi kn-aut-name=山崎慎一 kn-aut-sei=山崎 kn-aut-mei=慎一 aut-affil-num=3 ORCID= en-aut-name=KimuraKunio en-aut-sei=Kimura en-aut-mei=Kunio kn-aut-name=木村邦生 kn-aut-sei=木村 kn-aut-mei=邦生 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 en-keyword=Polyester kn-keyword=Polyester en-keyword=material recycle kn-keyword=material recycle en-keyword=crystallization kn-keyword=crystallization en-keyword=chain extension reaction kn-keyword=chain extension reaction END start-ver=1.4 cd-journal=joma no-vol=12 cd-vols= no-issue=1 article-no= start-page=157 end-page=160 dt-received= dt-revised= dt-accepted= dt-pub-year=2007 dt-pub=20070315 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Acceleration of Formation of Shish under Flow by Addition of Irregular Shaped Particles kn-title=流動場結晶化における異形微粒子添加によるshish構造形成の促進 en-subtitle= kn-subtitle= en-abstract= kn-abstract=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. en-copyright= kn-copyright= en-aut-name=YamazakiShinichi en-aut-sei=Yamazaki en-aut-mei=Shinichi kn-aut-name=山崎慎一 kn-aut-sei=山崎 kn-aut-mei=慎一 aut-affil-num=1 ORCID= en-aut-name=WakabayashiKanji en-aut-sei=Wakabayashi en-aut-mei=Kanji kn-aut-name=若林完爾 kn-aut-sei=若林 kn-aut-mei=完爾 aut-affil-num=2 ORCID= en-aut-name=MizumaKenta en-aut-sei=Mizuma en-aut-mei=Kenta kn-aut-name=水間健太 kn-aut-sei=水間 kn-aut-mei=健太 aut-affil-num=3 ORCID= en-aut-name=KimuraKunio en-aut-sei=Kimura en-aut-mei=Kunio kn-aut-name=木村邦生 kn-aut-sei=木村 kn-aut-mei=邦生 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 affil-num=2 en-affil= kn-affil=岡山大学 affil-num=3 en-affil= kn-affil=岡山大学 affil-num=4 en-affil= kn-affil=岡山大学 en-keyword=shish kn-keyword=shish en-keyword=crystallization kn-keyword=crystallization en-keyword=polypropylene kn-keyword=polypropylene en-keyword=shear flow kn-keyword=shear flow en-keyword=elongation kn-keyword=elongation en-keyword=injection molding kn-keyword=injection molding END