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  1. B200 工学部/工学研究科
  2. B200a 雑誌掲載論文
  3. 学術雑誌

Viscoelastic Properties of Dumbbell-Shaped Polystyrenes in Bulk and Solution

http://hdl.handle.net/2237/0002001523
http://hdl.handle.net/2237/0002001523
2a6f9ef3-a63e-46f9-b7a3-a66a9bf3ff8d
名前 / ファイル ライセンス アクション
20210115-Dumbbell 20210115-Dumbbell Rheology-tiff.pdf (1 MB)
Item type itemtype_ver1(1)
公開日 2021-10-15
タイトル
タイトル Viscoelastic Properties of Dumbbell-Shaped Polystyrenes in Bulk and Solution
言語 en
著者 Doi, Yuya

× Doi, Yuya

en Doi, Yuya

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Takano, Atsushi

× Takano, Atsushi

en Takano, Atsushi

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Takahashi, Yoshiaki

× Takahashi, Yoshiaki

en Takahashi, Yoshiaki

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Matsushita, Yushu

× Matsushita, Yushu

en Matsushita, Yushu

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 This document is the Accepted Manuscript version of a Published Work that appeared in final form in [Macromolecules], copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [https://pubs.acs.org/articlesonrequest/AOR-GZJFN8PTHJUUSBBRJSTK].”
内容記述
内容記述 This study examined viscoeslastic properties of two flexible dumbbell-shaped polystyrene (PS) samples, D-30/120/30 and D-30/240/30, which possess the same ring size (MR ∼ 30 kg/mol) and different lengths of central linear chains (ML ∼ 120 and 240 kg/mol) in bulk and solution. In bulk, both dumbbell PS samples exhibited an extremely long entanglement plateau in dynamic oscillatory measurements, and their terminal relaxation behavior was not observed in our experimental window. In stress relaxation measurements, dumbbell samples in bulk exhibited considerably slower terminal relaxation than high-molecular-weight linear PS samples (M ∼ 10^6 g/mol), and a clear difference between two dumbbell PS samples was observed in the long time regime, i.e., terminal relaxation of D-30/240/30 is much slower than that of D-30/120/30. These results suggest that (i) the dumbbell polymer forms a characteristic “network” where two rings on both ends in a molecule spontaneously thread the ring part of other dumbbell chains and (ii) this type of interchain interaction resulting in network formation becomes more dominant than usual entanglements similar to linear chains. The network of dumbbell chains starts to relax their stress when the intermolecular threading is released, and this release process tends to occur more frequently for the dumbbell with a shorter central chain, D-30/120/30, than that with a longer one, D-30/240/30. In dioctyl phthalate (DOP) solutions of D-30/240/30, where DOP is known as a θ-solvent for PS at 22 °C, in a relatively high concentration regime (i.e., 20–30 wt %), the solutions exhibited an entanglement plateau and higher viscosity than the corresponding linear PS solutions, suggesting that the characteristic entanglement originating from intermolecular threading of dumbbell chains is still dominant in the solution. On the contrary, in a lower-concentration regime (≤8 wt %), the D-30/240/30 solutions exhibited similar viscosities to the linear PS ones, wherein the dumbbell molecules behave like unentangled/isolated chains.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 ACS Publications
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ AM
出版タイプResource http://purl.org/coar/version/c_ab4af688f83e57aa
関連情報
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1021/acs.macromol.0c02050
収録物識別子
収録物識別子タイプ PISSN
収録物識別子 0024-9297
書誌情報 en : Macromolecules

巻 54, 号 3, p. 1366-1374, 発行日 2021-02-09
ファイル公開日
日付 2022-02-09
日付タイプ Available
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