Nonlinear stress properties of poly(styrene-block-butadiene-block-styrene) melt under elongational and shear deformation
| Autor: | Hideyuki Toda, Keiji Minagawa, Tatsuhiro Takahashi, Kenji Iwakura, Jun-ichi Takimoto, Kiyohito Koyama |
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| Rok vydání: | 1995 |
| Předmět: |
Materials science
Polymers and Plastics Deformation (mechanics) General Chemistry Surfaces Coatings and Films Stress (mechanics) chemistry.chemical_compound chemistry Ultimate tensile strength Materials Chemistry Stress relaxation Shear stress Polystyrene Elasticity (economics) Elongation Composite material |
| Zdroj: | Journal of Applied Polymer Science. 56:411-417 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/app.1995.070560401 |
| Popis: | Effects of block copolymerized structure on nonlinear stress properties under elongational and shear deformation were investigated. Samples used in this study were poly(styrene-block-butadiene-block-styrene) (SBS, weight rate of S/B = 40/60) and polystyrene (PS) as a reference. Tensile stress–strain and shear stress relaxation properties were measured at the molten state. SBS showed high elasticity after reaching the yield point under elongational deformation at room temperature. PS melt showed substantial tensile stress increase after the yield point as strain rates increased. However, SBS melt did not exhibit noticeable tensile stress rise at higher elongation, and this property was almost independent of strain rates. Stress relaxation experiments revealed that the damping function of SBS melt was more strain-softening than that of PS melt. The results suggested that the block copolymerized structure decreases melt elasticity under elongational and shear deformation. A transmission electron micrograph indicated that the lack of melt elasticity in SBS melt is caused by orientation of the lamellar structure toward the stretched direction during deformation. © 1995 John Wiley & Sons, Inc. |
| Databáze: | OpenAIRE |
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