Linear and cyclic amylose derivatives having brush like side groups in solution: Amylose tris(n-octadecylcarbamate)s

Ryoki, Akiyuki; Kim, DongChan; Kitamura, Shinichi; Terao, Ken

doi:https://doi.org/10.1016/j.polymer.2017.12.063

Linear and cyclic amylose derivatives having brush like side groups in solution: Amylose tris(n-octadecylcarbamate)s

Ryoki, Akiyuki; Kim, DongChan; Kitamura, Shinichi et al.

Polymer, 2018, 137, 13-21

アクセス数:380件（2025-07-12 22:56 集計）

固定URL: https://hdl.handle.net/11094/73783

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タイトル	Linear and cyclic amylose derivatives having brush like side groups in solution: Amylose tris(n-octadecylcarbamate)s
著者	NRID 1000070847102 1000070847102 著者名 Ryoki, Akiyuki
	著者名 Kim, DongChan
	NRID 1000060117869 1000060117869 著者名 Kitamura, Shinichi
	NRID 1000060334132 1000060334132 ORCID 0000-0001-7363-4491 0000-0001-7363-4491 researchmap permalink kenterao kenterao Scopus Author ID 7101653015 7101653015 著者名 Terao, Ken
キーワード等	Polysaccharide derivatives
	Cyclic polymers
	Wormlike chain
	Chain stiffness
	Hydrogen bond
抄録	Seven linear amylose tris(n-octadecylcarbamate) (ATODC) samples ranging in the weight-average molar mass Mw from 2.4 × 104 to 1.5 × 106 g mol−1 and their seven cyclic analogues (cATODC) of which Mw are from 3.6 × 104 to 1.9 × 105 g mol−1 were prepared to characterize their conformation in tetrahydrohuran (THF), in 2-octanone (MHK), and in tert-butyl methyl ether (MTBE). Light and small-angle X-ray scattering and viscosity measurements in dilute solution were employed to determine the particle scattering function P(q), the z-average mean-square radius of gyration 〈S2〉z, and the intrinsic viscosity [η]. The obtained data were analyzed in terms of the wormlike chain model to determine the helix pitch per residue h and the Kuhn segment length λ−1 which is a measure of the chain stiffness and equal to twice the persistence length. The parameters indicate that the linear ATODC has an appreciably extended local helical structure and high chain stiffness while the latter parameter λ−1 in THF is lower than those for amylose alkylcarbamates with shorter side chains. This is most likely due to the repulsion between relatively long side groups. This chain extension and less stiff main chain were more significantly observed for the cyclic chains. Lyotropic liquid crystallinity in concentrated solutions supports the high rigidity of ATODC and cATODC chains in solution.
出版者	Elsevier
収録物名	Polymer
巻(号)	137
ページ	13-21
刊行年月	2018-02-14
言語	英語
ハンドルURL	https://hdl.handle.net/11094/73783
PISSN	00323861
NCID	AA11537383
関連情報 (isVersionOf)	DOI (出版社版) https://doi.org/10.1016/j.polymer.2017.12.063
アクセス権	open access
権利情報	© 2017 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license. https://creativecommons.org/licenses/by-nc-nd/4.0/
出版タイプ	Accepted Manuscript
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Polymer. 2018, 137, p. 13-21
DC.title	Linear and cyclic amylose derivatives having brush like side groups in solution: Amylose tris(n-octadecylcarbamate)s
DC.creator	Ryoki, Akiyuki
	Kim, DongChan
	Kitamura, Shinichi
	Terao, Ken
DC.publisher	Elsevier
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2018-02-14
DC.identifier	https://doi.org/10.1016/j.polymer.2017.12.063
DC.subject	Polysaccharide derivatives
	Cyclic polymers
	Wormlike chain
	Chain stiffness
	Hydrogen bond
DCTERMS.abstract	Seven linear amylose tris(n-octadecylcarbamate) (ATODC) samples ranging in the weight-average molar mass Mw from 2.4 × 104 to 1.5 × 106 g mol−1 and their seven cyclic analogues (cATODC) of which Mw are from 3.6 × 104 to 1.9 × 105 g mol−1 were prepared to characterize their conformation in tetrahydrohuran (THF), in 2-octanone (MHK), and in tert-butyl methyl ether (MTBE). Light and small-angle X-ray scattering and viscosity measurements in dilute solution were employed to determine the particle scattering function P(q), the z-average mean-square radius of gyration 〈S2〉z, and the intrinsic viscosity [η]. The obtained data were analyzed in terms of the wormlike chain model to determine the helix pitch per residue h and the Kuhn segment length λ−1 which is a measure of the chain stiffness and equal to twice the persistence length. The parameters indicate that the linear ATODC has an appreciably extended local helical structure and high chain stiffness while the latter parameter λ−1 in THF is lower than those for amylose alkylcarbamates with shorter side chains. This is most likely due to the repulsion between relatively long side groups. This chain extension and less stiff main chain were more significantly observed for the cyclic chains. Lyotropic liquid crystallinity in concentrated solutions supports the high rigidity of ATODC and cATODC chains in solution.
DC.rights	© 2017 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license. https://creativecommons.org/licenses/by-nc-nd/4.0/
DC.format	73783
citation_title	Linear and cyclic amylose derivatives having brush like side groups in solution: Amylose tris(n-octadecylcarbamate)s
citation_author	Ryoki, Akiyuki
	Kim, DongChan
	Kitamura, Shinichi
	Terao, Ken
citation_publisher	Elsevier
citation_language	英語
citation_date	2018-02-14
citation_journal_title	Polymer
citation_volume	137
citation_firstpage	13
citation_lastpage	21
citation_doi	https://doi.org/10.1016/j.polymer.2017.12.063
citation_public_url	https://hdl.handle.net/11094/73783

Linear and cyclic amylose derivatives having brush like side groups in solution: Amylose tris(n-octadecylcarbamate)s

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