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:info:doi/10.1016/j.polymer.2017.12.063

このアイテムのアクセス数:26件（2020-10-28 15:08 集計）

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論文情報

タイトル	Linear and cyclic amylose derivatives having brush like side groups in solution: Amylose tris(n-octadecylcarbamate)s
著者	Ryoki, Akiyuki Ryoki, Akiyuki
	Kim, DongChan Kim, DongChan
	Kitamura, Shinichi Kitamura, Shinichi
	Terao, Ken 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.
公開者	Elsevier
掲載誌名	Polymer
巻	137
開始ページ	13
終了ページ	21
刊行年月	2018-02-14
ISSN	00323861
NCID	AA11537383
DOI	info:doi/10.1016/j.polymer.2017.12.063
URL	http://hdl.handle.net/11094/73783
権利情報	© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
言語	英語
カテゴリ	学術雑誌論文 Journal Article

著者版フラグ	author
NII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.137 P.13-P.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
DCTERMS.issued" scheme="DCTERMS.W3CDTF	2018-02-14
DC.identifier	info:doi/10.1016/j.polymer.2017.12.063
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/73783
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	© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
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_issn	00323861
citation_doi	info:doi/10.1016/j.polymer.2017.12.063
citation_public_url	http://hdl.handle.net/11094/73783
citation_keywords	Polysaccharide derivatives
	Cyclic polymers
	Wormlike chain
	Chain stiffness
	Hydrogen bond

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