Morphology and micromechanical deformation behavior of styrene–butadiene block copolymers. IV. Structure–property correlation in binary block copolymer blends

Adhikari, Rameshwar; Michler, Goerg H.; Henning, Sven; Godehardt, R.; Huy, Trinh An; Goerlitz, S.; Knoll, Konrad

doi:10.1002/app.20126

Cited by 19 publications

(10 citation statements)

References 25 publications

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“…Although for partially miscible SB star block/triblock copolymer blends two brittle‐to‐tough transitions have been observed, the mechanical properties, such as σ y and the strain at break, depend exponentially or linearly on the composition 12, 13. The morphologies in this system resemble the neat copolymers, causing a simple change in the mechanical properties 17. In contrast, for the miscible LN3/LN4 system, consisting of blends of similar architectures, hexagonal and bicontinuous morphologies were observed that were not found in the neat copolymers, and they resulted in a nonmonotonic dependence of the mechanical properties on the composition.…”

Section: Resultsmentioning

confidence: 94%

Morphology and mechanical properties of binary triblock copolymer blends

Lach

Weidisch

Knoll

2005

J Polym Sci B Polym Phys

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The influence of the morphology on the mechanical properties of binary styrene–butadiene (SB) triblock copolymer blends of a thermoplastic block copolymer and a thermoplastic elastomer (TPE) with different molecular architectures was studied with bulk samples prepared from toluene. Both block copolymers contained SB random copolymer middle blocks, that is, the block sequence S–SB–S. The two miscible triblock copolymers were combined to create a TPE with increased tensile strength without a change in their elasticity. The changes in the equilibrium morphology of the miscible triblock copolymer blends as a function of the TPE content (lamellae, bicontinuous morphology, hexagonal cylinders, and worms) resulted in a novel morphology–property correlation: (1) the strain at break and Young's modulus of blends with about 20 wt % TPE were larger than those of the pure thermoplastic triblock copolymer; (2) at the transition from bicontinuous structures to hexagonal structures (∼35 wt % TPE), a change in the mechanical properties from thermoplastic to elastomeric was observed; and (3) in the full range of wormlike and hexagonal morphology (60–100 wt % TPE), elastomeric properties were observed, the strength greatly increasing and high‐strength elastomers resulting. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 429–438, 2005

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Section: Resultsmentioning

confidence: 94%

Morphology and mechanical properties of binary triblock copolymer blends

Lach

Weidisch

Knoll

2005

J Polym Sci B Polym Phys

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“…[7] In the last few decades, the structure-property relationships and the deformation mechanisms of di-and tri-block copolymers based on thermoplastic elastomers (TPE) containing glassy and rubbery segments have been investigated. [3,[8][9][10][11][12][13][14] In general, TPEs are composed of two or more microphase-separated components. The most commonly used TPE is the binary triblock copolymer polystyrene-b-polybutadiene-bpolystyrene, SBS.…”

Section: Introductionmentioning

confidence: 99%

Deformation and orientation behavior of polystyrene-b-polybutadiene-b-poly(methyl methacrylate) triblock terpolymers: Influence of polybutadiene microstructures and the molar masses

Kabir

Albuerne

Simon

et al. 2013

Polymer

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Morphological changes caused by deformation and orientation of different domains of polystyrene-b-polybutadiene-b-poly(methyl methacrylate),SBM, triblock terpolymers were investigated using in-situ small angle X-ray scattering (SAXS), tensile testing, and transmission electron microscopy (TEM). Two sets of SBM triblock terpolymers with similar weight fractions of the three blocks were studied. The two sets differ in terms of their molecular weights. Each set contained two SBM differing in their polybutadiene isomers (1,2-and 1,4-B). Results showed that for 1,2-B based SBMs polybutadiene forms cylindrical domains which coalesce in the glassy lamellar matrix of the two glassy outer blocks whereas the lower molar mass 1,4-B based SBM forms mixed S/M and the higher one forms well segregated long range ordered lamellae. These morphological differences indicate that the deformation and the orientation behavior of the polymers' domains differ. In 1,2-B based SBMs yielding at high stresses was followed by a stress drop after the yield point. The other polymer type showed homogeneous deformation of the lamellar domains at their yield point. 2D-SAXS during deformation of the triblock terpolymers showed an anisotropic deformation pattern in the 1,2-B SBMs, whereas four point SAXS patterns were found for the 1,4-B SBMs. Further studies showed that the fragmented lamellar planes of the lower molar mass 1,2-SBM oriented randomly whereas the orientation of the lamellar planes of the higher molar mass 1,2-B SBM was parallel to the strain direction. The alignment of the lamellar planes of 1,4-B SBMs were randomly distributed in the unstretched state.

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“…Triblock copolymers with glass‐rubber‐glass chain architectures are observed to have high tensile strength when compared to diblock copolymers, which is due to the immobilisation of the elastomer segments in‐between nonelastomeric segments 8. Studies on the morphological and mechanical behaviour of different polystyrene/polybutadiene (PS/PB) triblock and starblock copolymer systems has given deeper insight into the characteristics of various molecular architectures 9–11. Phase behaviour and morphology of a symmetric and an asymmetric S‐(S/B)‐S triblock copolymer have been discussed by Lach et al,12 where the compositions of the S/B middle block and the PS outer blocks were found to have a significant influence on the miscibility and thus on the morphology of these copolymers.…”

Section: Introductionmentioning

confidence: 99%

Influence of Molecular Weight on Physical and Mechanical Properties of Linear Symmetric S‐(S/B)‐S Triblock Copolymers

Thunga

Staudinger

Ganß

et al. 2009

Macro Chemistry & Physics

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Symmetric linear S‐(S/B)‐S triblock copolymers with 80 wt.‐% of PS having a block composition of 20‐60‐20 and a S/B ratio of 70:30 in the middle block are studied with varying molecular weights ($\overline M _{\rm w}$). Increase in the $\overline M _{\rm w}$ leads to a change in the morphology from disordered to ordered microphase separated structure, as characterised by TEM and SAXS. Two distinct glass transitions for PS‐ and PB‐rich phases are observed from DMA measurements, which are due to phase separation at high $\overline M _{\rm w}$. Rheological studies (master curves) reveal an extended rubbery plateau and a delay in the terminal response with an increase in $\overline M _{\rm w}$, whereas a terminal flow behaviour is observed for materials having a disordered nature at low $\overline M _{\rm w}$. A brittle‐to‐tough transition is observed from tensile tests with the increase in $\overline M _{\rm w}$.magnified image

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Morphology and micromechanical deformation behavior of styrene–butadiene block copolymers. IV. Structure–property correlation in binary block copolymer blends

Cited by 19 publications

References 25 publications

Morphology and mechanical properties of binary triblock copolymer blends

Morphology and mechanical properties of binary triblock copolymer blends

Deformation and orientation behavior of polystyrene-b-polybutadiene-b-poly(methyl methacrylate) triblock terpolymers: Influence of polybutadiene microstructures and the molar masses

Influence of Molecular Weight on Physical and Mechanical Properties of Linear Symmetric S‐(S/B)‐S Triblock Copolymers

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