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j.polymer.2011.10.032.pdf | 782.15 kB | Adobe PDF | 見る/開く |
タイトル: | Structural characterization of poly(ε-caprolactone)-grafted cellulose acetate and butyrate by solid-state 13C NMR, dynamic mechanical, and dielectric relaxation analyses |
著者: | Kusumi, Ryosuke Teramoto, Yoshikuni https://orcid.org/0000-0003-3850-3570 (unconfirmed) Nishio, Yoshiyuki |
著者名の別形: | 西尾, 嘉之 |
キーワード: | Cellulose ester-graft-aliphatic polyester Molecular dynamics Heterogeneity |
発行日: | Nov-2011 |
出版者: | Elsevier Ltd. |
誌名: | Polymer |
巻: | 52 |
号: | 25 |
開始ページ: | 5912 |
終了ページ: | 5921 |
抄録: | Investigations were made into the molecular dynamics and intercomponent mixing state in solid films of two series of cellulosic graft copolymers, cellulose acetate-g-poly(ε-caprolactone) (CA-g-PCL) and cellulose butyrate-g-PCL (CB-g-PCL), both series being prepared over a wide range of compositions with CAs or CBs of acyl DS ≈ 2.1, 2.5, and 2.95. It was shown by T_1ρ^H measurements in solid-state [13]C NMR spectroscopy that all the copolymer samples, except ones using CA of DS = 2.98, formed an amorphous monophase in which the trunk and graft components were mixed homogeneously at least in a scale of a few nanometers. However, those copolymer samples gave, more or less, a response of dynamic heterogeneity, when examined under mechanical oscillation. Through dielectric relaxation measurements, a clear comparison was made between the CA-g-PCL and CB-g-PCL series, regarding the cooperativeness in segmental motions of the trunk and graft chains, directly associated with the extent of the dynamic heterogeneity. The cooperativeness was generally higher in the CB-based copolymer series, probably due to working of the butyryl substituent as an internal compatibilizer. |
著作権等: | © 2011 Elsevier Ltd. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/151853 |
DOI(出版社版): | 10.1016/j.polymer.2011.10.032 |
出現コレクション: | 学術雑誌掲載論文等 |
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