Molecular mass distribution of polystyrene obtained using Li-organic compounds in benzene

Summary: Protonated star-shaped polystyrenes with single and double fullerene C 60 core and the hybrid stars with pairs of polar and non-polar arms (tertbuthylmetacrylate, polystyrene) have been studied in deuterated toluene (20 8C) by small-angle neutron scattering at low and moderate polymer concentrations (c 1 $ 1 g/dl, c 2 $ 3-6 g/dl) to evaluate the peculiarities of fullerene centre action on polymers selfassembly in solutions. As we found, the cores composed of two fullerenes, linked via Si(CH 3 ) 2 -bridge, induce stars' anisotropic interactions and association into chain-like structures (correlation radius $400-600 nm). Meanwhile, the single-core stars of polystyrene and hybrids organize globular clusters (size $ 10 3 nm) those geometry do not change significantly by polymer content variation.

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“…[8] In this way there were prepared single-core stars C 60 (PS) f (f ¼ 6, the mass of polystyrene arm M PS ¼ 5 Á 10 3 ) and 12-arm…”

Section: Experimental Partmentioning

confidence: 99%

Neutron Scattering Studies of Structure and Self‐Assembly of Star‐Shaped Polymers with Fullerene Centres in Solutions

Лебедев

Виноградова

Török

2010

Macromolecular Symposia

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Lamellar structure formation in the mixture of two cylinder‐forming block copolymers

Vilesov

Floudas

Pakuła

et al. 1994

Macro Chemistry & Physics

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Two cylinder-forming polystyrene-block-polybutadiene block copolymers of type A-B with antisymmetric composition (polymer PI with A : B = 3 : 1 (w/w) and polymer P2 with A : B = 1 : 3 (w/w)) and their binary mixture were studied by small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) in order to determine the microphase structure. The cylindrical microstructure is confirmed for both copolymers, whereas, in the mixture, both techniques have unambiguously shown that a regular lamellar structure is obtained at the polymer-polymer composition P1 : P2 = 1 : 1 (ratio of the numbers of chains). Qualitatively, the same results are obtained for corresponding systems simulated by the cooperative motion algorithm (CMA). Direct observations of the structure as well as the cooperative structure factors determined in the strong segregation limit for the simulated systems indicated lamellar structures in the blend of composition P1 :P2 = 1 : 1, in contrast to the microfibrillar morphology of the copolymers. The simulation additionally indicated a polymer-polymer microseparation. The experimental and simulation results are compared with theoretical predictions based on the self consistent field theory.

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Mechanism of deactivation of growing chains in the processes of ionic polymerization of vinyl monomers. Review

Yerusalimskii

1985

Polymer Science U.S.S.R.

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Molecular mass distribution of polystyrene obtained using Li-organic compounds in benzene

Cited by 9 publications

References 10 publications

Neutron Scattering Studies of Structure and Self‐Assembly of Star‐Shaped Polymers with Fullerene Centres in Solutions

Neutron Scattering Studies of Structure and Self‐Assembly of Star‐Shaped Polymers with Fullerene Centres in Solutions

Lamellar structure formation in the mixture of two cylinder‐forming block copolymers

Mechanism of deactivation of growing chains in the processes of ionic polymerization of vinyl monomers. Review

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