2003年4月
Shear-induced disruption and recovery of microphase-separated network structure of a BSB triblock copolymer in dibutyl phthalate
MACROMOLECULES
- ,
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- 巻
- 36
- 号
- 8
- 開始ページ
- 2886
- 終了ページ
- 2893
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/ma021654q
- 出版者・発行元
- AMER CHEMICAL SOC
Rheological and structural properties were examined for a 30 wt % solution of a 1,4-butadiene-styrene-1,4-butadiene (BSB) triblock copolymer (M-S = 108 x 10(3), M-B = 13.3 x 10(3) for each B block) in an S-selective solvent, dibutyl phthalate (DBP). At equilibrium at 25 degreesC, a bee lattice of the unsolved, soft (rubbery) B domains connected by the middle S blocks (a lattice-type network) was formed to exhibit the elastic behavior against small strains. This lattice-type network was disrupted under steady shear to lose its elasticity, and the strongest disruption occurred at an intermediate shear rate (gamma) over dot close to a frequency of B/S concentration fluctuation. This disruption behavior was similar to that of a BS/DBP diblock micellar lattice system. However, for the BSB/DBP system, an order of magnitude increase of (gamma) over dot resulted in a minor change (by a factor <30%) of a time t(r)(infinity) required for the full recovery of the elasticity during a quiescent rest after the preshear. This result, quantitatively different from that seen for the BS/DBP diblock system, was related to the bridge-type configuration of the middle S blocks of BSB: Under the steady shear, a large fraction of the bridges in the flowing defect region would be converted into loops. Thus, the re-formation of the bridges in this region (a process absent in the BS/DBP system) should be required for the full recovery of the elasticity of the BSB/DBP system. This bridge re-formation, leading to a recovery of the order of the B domain arrangement and allowing the coexisting loops to exhibit the elasticity, should be accompanied by a transient mixing of the B and S block and thus gave the very weakly (gamma) over dot-dependent t(r)(infinity) determined by the mixing enthalpy.
- リンク情報
-
- DOI
- https://doi.org/10.1021/ma021654q
- J-GLOBAL
- https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200902287614794584
- Web of Science
- https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000182361700048&DestApp=WOS_CPL
- URL
- http://www.scopus.com/inward/record.url?eid=2-s2.0-0037461395&partnerID=MN8TOARS
- ID情報
-
- DOI : 10.1021/ma021654q
- ISSN : 0024-9297
- J-Global ID : 200902287614794584
- ORCIDのPut Code : 76271968
- SCOPUS ID : 0037461395
- Web of Science ID : WOS:000182361700048