Deformation behavior of styrene-block-butadiene-block-styrene triblock copolymers having different morphologies

Huy, Trinh An; Adhikari, Rameshwar; Michler, Goerg H.

doi:10.1016/s0032-3861(02)00548-7

Cited by 76 publications

(56 citation statements)

References 36 publications

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“…A detailed account of orientation behaviour of styrene/butadiene block copolymers with different morphologies may be found elsewhere. [55] The orientation function (DF) of individual phases in linear and radial block copolymers (LN1 and ST2) is plotted as a function of nominal strain in Figure 9. The orientation of both the phases in each sample is almost constant up to a strain of about 5-10%.…”

Section: Orientation Behaviour Of the Block Copolymersmentioning

confidence: 99%

Correlation between Molecular Architecture, Morphology, and Deformation Behaviour of Styrene/Butadiene Block Copolymers

Adhikari

Michler

Huy

et al. 2003

Macro Chemistry & Physics

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The correlation between the molecular architecture, morphology, and micromechanical deformation behaviour of styrene/butadiene (SB) block copolymers with different architectures (linear and star block copolymers, total styrene content, ΦST = 0.74) was studied using dynamic mechanical analysis (DMA), uniaxial tensile testing, scanning force microscopy (SFM), and high voltage electron microscopy (HVEM). Deformation of the individual phases under uniaxial strain at the molecular level was monitored by Fourier transform infrared (FT‐IR) spectroscopy. It was demonstrated that the morphology and deformation behaviour of these block copolymers are strongly influenced by their molecular topology, block symmetry, and the nature of the interface between the component blocks. While the cylindrical morphology (hexagonal polybutadiene (PB) cylinders in polystyrene (PS) matrix) was observed in a symmetric SBS triblock copolymer with ΦST = 0.74, a “two‐component three‐phase” morphology was found in an asymmetric star block copolymer having an equivalent chemical composition and an SBS arm structure. Likewise, an SBS triblock copolymer with a composition identical to the former ones but with highly asymmetric PS end blocks revealed a lamellar morphology. While no locally confined deformation zones were observed in the lamellar block copolymers, the cylindrical block copolymer was found to deform through the formation of highly localised craze‐like deformation zones.

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Section: Orientation Behaviour Of the Block Copolymersmentioning

confidence: 99%

Correlation between Molecular Architecture, Morphology, and Deformation Behaviour of Styrene/Butadiene Block Copolymers

Adhikari

Michler

Huy

et al. 2003

Macro Chemistry & Physics

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“…[13] This polymer involves a highly asymmetric styrene/butadiene star block copolymer of polystyrene (PS) and random PS-co-PB [poly(styrene-co-butadiene)] copolymer. [14,15] Because there is a strong correlation between the character of the yield region and permanent deformation, understanding the yielding process is very important to the understanding of the complete deformation process. However, in the literature available, the double yielding phenomenon was generally observed in PE and their blends.…”

Section: Introductionmentioning

confidence: 99%

Morphology Dependent Double Yielding in Injection Molded Polycarbonate/Polyethylene Blend

Huang

Yang

et al. 2004

Macro Materials & Eng

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Summary: Polycarbonate (PC)/polyethylene (PE) blend was injection molded at different molding temperatures. The morphological observation by scanning electronic microscope (SEM) indicated that the sample molded at 190 °C contained only uniformly dispersed spherical PC particles. The samples molded at 230 and 275 °C had a typical skin‐core structure, and there were many injection‐induced PC fibers in the subskin. While the sample molded at 190 °C had the usual stress‐strain behavior, the samples obtained at 230 and 275 °C showed apparently double yielding behavior. It was suggested that the double yielding points were morphology‐dependent. The first one was the result of the yielding of PE at low strain, and the second one was caused by the yielding of the PC fibers. Moreover, it is the frictional force in the interfaces between PC and PE that transferred the stress to the PC fibers, hence giving rise to the reinforcement of PE by PC.Stress‐strain curves of PC/PE blends injection molded at various temperatures showing first (I) and second (II) yielding points.magnified imageStress‐strain curves of PC/PE blends injection molded at various temperatures showing first (I) and second (II) yielding points.

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“…All composites exhibited strain hardening past the yield, due to deformation of the hard (polystyrene) domains and alignment of polymer chains in both segments. 62 As shown in Figure 8(b), phenylPOSS composites displayed higher strain hardening moduli than isobutylPOSS (refer Table I) and supported greater stress levels past the yield. Within elastomers, the glassy components contribute to strain hardening by providing rigidity.…”

Section: Stress-strain Analysismentioning

confidence: 73%

Novel elastomer‐dumbbell functionalized POSS composites: Thermomechanical and Morphological Properties

Spoljaric

Genovese

Shanks

2011

J of Applied Polymer Sci

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Nanocomposites consisting of poly(styreneb-butadiene-b-styrene) (SBS) and polyhedral oligomeric silsesquioxanes (POSS) were prepared using a solvent dispersion method. Dumbbell-shaped POSS fillers were prepared using diacyl chlorides to bridge the POSS molecules. Infrared spectroscopy confirmed functionalization. Scanning electron microscopy revealed an increase in filler aggregation with concentration, with preferential phase selectivity. Polydispersity increased with filler concentration while d spacing was influenced by phase selectivity and domain-filler compatibility. Functionalized POSS improved thermal stability by imparting restrictions of SBS chain motions. Tensile stress-strain analysis revealed an increase in modulus, yield strength, and strain hardening with filler concentration, while creep deformation decreased and permanent strain increased with POSS content. Storage modulus, loss modulus, and glass transition temperature increased with filler content due to effective SBS-POSS interaction. Nanocomposite properties were influenced by filler concentration, the phase of the filler was dispersed throughout and the length of the alkyl ''barbell'' on the dumbbell-shaped POSS.

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Deformation behavior of styrene-block-butadiene-block-styrene triblock copolymers having different morphologies

Cited by 76 publications

References 36 publications

Correlation between Molecular Architecture, Morphology, and Deformation Behaviour of Styrene/Butadiene Block Copolymers

Correlation between Molecular Architecture, Morphology, and Deformation Behaviour of Styrene/Butadiene Block Copolymers

Morphology Dependent Double Yielding in Injection Molded Polycarbonate/Polyethylene Blend

Novel elastomer‐dumbbell functionalized POSS composites: Thermomechanical and Morphological Properties

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