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Title: Structural characterization of poly(ε-caprolactone)-grafted cellulose acetate and butyrate by solid-state 13C NMR, dynamic mechanical, and dielectric relaxation analyses
Authors: Kusumi, Ryosuke  kyouindb  KAKEN_id
Teramoto, Yoshikuni  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-3850-3570 (unconfirmed)
Nishio, Yoshiyuki  kyouindb  KAKEN_id
Author's alias: 西尾, 嘉之
Keywords: Cellulose ester-graft-aliphatic polyester
Molecular dynamics
Heterogeneity
Issue Date: Nov-2011
Publisher: Elsevier Ltd.
Journal title: Polymer
Volume: 52
Issue: 25
Start page: 5912
End page: 5921
Abstract: 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.
Rights: © 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(Published Version): 10.1016/j.polymer.2011.10.032
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