Spheres on spheres - a novel spherical multiphase morphology in polystyrene-block-polybutadiene-block-poly(methyl methacrylate) triblock copolymers

Breiner, U.; Krappe, Udo; Jakob, Thomas; Abetz, Volker; Stadler, Reimund

doi:10.1007/s002890050245

Cited by 80 publications

(88 citation statements)

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“…In full agreement with the spherical morphology found for PFS-b-PMMA diblock copolymers reported recently, [10] we assume that this limited long-range structural perfection is due to the rather high viscosity of the polymer melt, even under annealing conditions and thus, is a direct consequence of the high molecular weights of the samples under investigation. The morphologies found for S 13 F 13 M 101 74 and S 13 F 19 M 110 68 are fully consistent with the morphology of the corresponding SBM (polystyrene-block-polybutadieneblock-PMMA) and SEBM [polystyrene-block-poly(ethyleneco-butylene)-block-PMMA] triblock copolymers published by Breiner et al [23] These authors report the formation of ''spheres on spheres'' (sos) morphologies for materials containing high volume fractions of the matrix polymer. Table 1.…”

Section: Tem Analysis Of Microphase-separated Film Samplessupporting

confidence: 72%

Styrene–Ferrocenyldimethylsilane–Methyl Methacrylate Triblock Copolymers: Synthesis and Phase Morphology

Kloninger¹,

Rehahn²

2007

Macro Chemistry & Physics

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Triblock copolymers were synthesized from styrene (S), dimethylsilaferrocenophane (FS), and methyl methacrylate (MMA) via sequential anionic polymerization, taking advantage of the dimethylsilacyclobutane‐mediated endcapping of the living PS‐b‐PFS precursors. Well‐defined materials were obtained, having molecular weights of around 100 000 g · mol−1 and polydispersity indices of below 1.1. First investigations of the microphase behavior show that the materials selforganize in bulk morphologies where PMMA is the matrix while PS forms either spheres or cylinders. The central short PFS block forms either droplets or cylinders, which are placed at the surface of the PS domains.magnified image

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Section: Tem Analysis Of Microphase-separated Film Samplessupporting

confidence: 72%

Styrene–Ferrocenyldimethylsilane–Methyl Methacrylate Triblock Copolymers: Synthesis and Phase Morphology

Kloninger¹,

Rehahn²

2007

Macro Chemistry & Physics

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“…Block copolymers give rise to a variety of morphologies as they experience self-assembly based on microphase separation (Bates and Fredrickson (1990); Krappe et al (1995) ;Breiner et al (1998); Kaneko et al (2006); Bates and Fredrickson (1999); Abetz and Boschetti-deFierro (2012)). For diblock copolymers specific microstructures can be achieved by controlling the volume fraction f and the product of χN, where χ is the Flory-Huggins interaction parameter and N the degree of polymerization (Leibler (1980); Matsen and Bates (1997); Khandpur et al (1995)).…”

Section: Introductionmentioning

confidence: 99%

Morphology and elasticity of polystyrene-block-polyisoprene diblock copolymers in the melt

Haenelt

Georgopanos

Abetz

et al. 2014

Korea-Aust. Rheol. J.

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The influence of morphology on the viscoelastic properties of melts of microphase-separated polystyrene-block-polyisoprene (PS-b-PI) diblock copolymers was investigated in oscillatory and creep recovery experiments. By means of anionic polymerization, three PS-b-PI diblock copolymers with a narrow molecular weight distribution and different types of morphology (spherical, cylindrical and lamellar microstructure) were prepared. Linear viscoelastic shear oscillations and creep recovery experiments in shear were performed in order to determine the elastic and viscous properties of the diblock copolymers in the melt at small and large time scales. Our analysis reveals that melts of diblock copolymers are characterized by a pronounced elastic behavior leading to a relatively large recoverable deformation in creep recovery experiments. The elasticity of the diblock copolymers is also revealed by the appearance of the creep-ringing effect. Morphological investigations were carried out to establish relations between microstructure and melt elasticity. Since ordering phenomena take place in melts of diblock copolymers until an equilibrium morphology is achieved, the storage modulus G' of diblock copolymer melts increases with time up to a steady-state value.

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“…The block sequence also matters when the interaction parameters are very different [25]. For instance, polystyrene-bpolybutadiene-b-poly(methyl methacrylate) copolymers were found to selfassemble into many different complex structures such as spheres on spheres [52] or helices on cylinders [53] embedded in a continuous matrix formed by the majority component, and many other morphologies like the knitting pattern [54]. The phase diagram of polyisoprene-b-polystyrene-b-poly(ethylene oxide) has been extensively explored leading to the discovery of a succession of three different network morphologies [26].…”

Section: Beyond Diblock Copolymer Meltsmentioning

confidence: 99%

Block Copolymers in External Fields: Rheology, Flow‐Induced Phenomena, and Applications

Cloître

Vlassopoulos

2011

Applied Polymer Rheology

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Spheres on spheres - a novel spherical multiphase morphology in polystyrene-block-polybutadiene-block-poly(methyl methacrylate) triblock copolymers

Cited by 80 publications

References 0 publications

Styrene–Ferrocenyldimethylsilane–Methyl Methacrylate Triblock Copolymers: Synthesis and Phase Morphology

Styrene–Ferrocenyldimethylsilane–Methyl Methacrylate Triblock Copolymers: Synthesis and Phase Morphology

Morphology and elasticity of polystyrene-block-polyisoprene diblock copolymers in the melt

Block Copolymers in External Fields: Rheology, Flow‐Induced Phenomena, and Applications

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