NDLI: Linear viscoelasticity of styrenic block copolymers

Content Provider	Springer Nature Link
Author	Carastan, Danilo Justi Demarquette, Nicole Raymonde Vermogen, Alexandre Masenelli Varlot, Karine
Copyright Year	2008
Abstract	In this work, the rheological behavior of block copolymers with different morphologies (lamellar, cylindrical, spherical, and disordered) and their clay-containing nanocomposites was studied using small amplitude oscillatory shear. The copolymers studied were one asymmetric starblock styrene–butadiene–styrene copolymer and four styrene–ethylene/butylenes–styrene copolymers with different molecular architectures, one of them being modified with maleic anhydride. The nanocomposites of those copolymers were prepared by adding organophilic clay using three different preparation techniques: melt mixing, solution casting, and a hybrid melt mixing–solution technique. The nanocomposites were characterized by X-ray diffraction and transmission electron microscopy, and their viscoelastic properties were evaluated and compared to the ones of the pure copolymers. The influence of copolymer morphology and presence of clay on the storage modulus (G′) curves was studied by the evaluation of the changes in the low frequency slope of log G′× logω (ω: frequency) curves upon variation of temperature and clay addition. This slope may be related to the degree of liquid- or solid-like behavior of a material. It was observed that at temperatures corresponding to the ordered state, the rheological behavior of the nanocomposites depended mainly on the viscoelasticity of each type of ordered phase and the variation of the slope due to the addition of clay was small. For temperatures corresponding to the disordered state, however, the rheological behavior of the copolymer nanocomposites was dictated mostly by the degree of clay dispersion: When the clay was well dispersed, a strong solid-like behavior corresponding to large G′ slope variations was observed.
Starting Page	521
Ending Page	536
Page Count	16
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	47
Issue Number	5-6
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-05-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nanocomposites Block copolymers Clay Linear viscoelasticity Food Science Mechanical Engineering Soft Matter, Complex Fluids Polymer Sciences Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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