NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
53rd NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
Session ID : 3C15
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OS18-1
Flow-Induced Disruption and Recovery of a Tribrock Copolymer Network System
*hiroshi Watanabe
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Abstract
Rheological and structural properties were examined for a 30wt% solution of a butadiene-styrene-butadiene (BSB) triblock copolymer in an S-selective solvent, dibutyl phthalate (DBP). At equilibrium at 25C, a bcc 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 (g) close to a frequency of B/S concentration fluctuation. An order of magnitude increase of g resulted in a minor change of a time required for the full recovery of the elasticity during a quiescent rest after the shear. This result, quantitatively different from that seen for the BS/DBP diblock system, was related to reformation of the bridge-type configuration of the middle S blocks of BSB.
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© 2004 Committee for Mechanics and Structure,Science Council
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