Polymacromonomer Consisting of Polystyrene : Light Scattering Characterization in Cyclohexane

Takeo, Yoshishige; Tazaki, Masataka; Nakamura, Yo; Terao, Ken; Norisuye, Takashi

doi:info:doi/10.1295/polymj.31.193

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タイトル	Polymacromonomer Consisting of Polystyrene : Light Scattering Characterization in Cyclohexane
著者	Takeo, Yoshishige Takeo, Yoshishige
	Tazaki, Masataka Tazaki, Masataka
	Nakamura, Yo Nakamura, Yo
	Terao, Ken Terao, Ken
	Norisuye, Takashi Norisuye, Takashi
キーワード等	Polymacromonomer
	Branched Polymer
	Θ Point
	Wormlike Chain
	Chain Stiffness
	Excluded-Volume Effect
抄録	Nine samples of a polymacromonomer consisting of polystyrene with a fixed side-chain length of 33 styrene residues and ranging in total weight-average molecular weight M_w from 1.9 × 10^5 to 1.1 × 10^7 have been prepared and studied by light scattering in cyclohexane at temperatures between 25 and 45°C. The second virial coefficient is found to vanish at 34.5 (±2)°C, the Θ temperature for linear polystyrene in cyclohexane. The M_w dependence of z-average mean-square radius of gyration 〈S^2〉_z at this temperature is analyzed on the basis of the wormlike chain to obtain 22 nm for Kuhn's statistical segment length λ^<-1> and 13000 nm^<-1> for the molar mass per unit contour length. The chain stiffness as indicated by this λ^<-1> value is one order of magnitude higher than that of linear polystyrene. Analysis of 〈S^2〉_z at temperatures other than the Θ point is also made with the aid of the quasi-two-parameter theory for excluded-volume effects. It is found that λ^<-1> increases gradually with raising temperature or increasing excluded-volume strength.
公開者	Nature Publishing Group
掲載誌名	Polymer Journal
巻	31
号	2
開始ページ	193
終了ページ	198
刊行年月	1999-02
ISSN	00323896
NCID	AA00777013
DOI (出版社版)	info:doi/10.1295/polymj.31.193
URL	http://hdl.handle.net/11094/25929
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 Journal.31(2) P.193-P.198
DC.title	Polymacromonomer Consisting of Polystyrene : Light Scattering Characterization in Cyclohexane
DC.creator	Takeo, Yoshishige
	Tazaki, Masataka
	Nakamura, Yo
	Terao, Ken
	Norisuye, Takashi
DC.publisher	Nature Publishing Group
DC.language" scheme="DCTERMS.RFC1766	英語
DCTERMS.issued" scheme="DCTERMS.W3CDTF	1999-02
DC.identifier	info:doi/10.1295/polymj.31.193
DC.identifier" scheme="DCTERMS.URI	http://hdl.handle.net/11094/25929
DC.subject	Polymacromonomer
	Branched Polymer
	Θ Point
	Wormlike Chain
	Chain Stiffness
	Excluded-Volume Effect
DCTERMS.abstract	Nine samples of a polymacromonomer consisting of polystyrene with a fixed side-chain length of 33 styrene residues and ranging in total weight-average molecular weight M_w from 1.9 × 10^5 to 1.1 × 10^7 have been prepared and studied by light scattering in cyclohexane at temperatures between 25 and 45°C. The second virial coefficient is found to vanish at 34.5 (±2)°C, the Θ temperature for linear polystyrene in cyclohexane. The M_w dependence of z-average mean-square radius of gyration 〈S^2〉_z at this temperature is analyzed on the basis of the wormlike chain to obtain 22 nm for Kuhn's statistical segment length λ^<-1> and 13000 nm^<-1> for the molar mass per unit contour length. The chain stiffness as indicated by this λ^<-1> value is one order of magnitude higher than that of linear polystyrene. Analysis of 〈S^2〉_z at temperatures other than the Θ point is also made with the aid of the quasi-two-parameter theory for excluded-volume effects. It is found that λ^<-1> increases gradually with raising temperature or increasing excluded-volume strength.
citation_title	Polymacromonomer Consisting of Polystyrene : Light Scattering Characterization in Cyclohexane
citation_author	Takeo, Yoshishige
	Tazaki, Masataka
	Nakamura, Yo
	Terao, Ken
	Norisuye, Takashi
citation_publisher	Nature Publishing Group
citation_language	英語
citation_date	1999-02
citation_journal_title	Polymer Journal
citation_volume	31
citation_issue	2
citation_firstpage	193
citation_lastpage	198
citation_issn	00323896
citation_doi	info:doi/10.1295/polymj.31.193
citation_public_url	http://hdl.handle.net/11094/25929
citation_keywords	Polymacromonomer
	Branched Polymer
	Θ Point
	Wormlike Chain
	Chain Stiffness
	Excluded-Volume Effect

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