Étude de l’agrégation des copolymères séquences polystyrène-polyparaphénylène par diffusion de la lumière et des neutrons

Widawski, Gilles; Rawiso, M.; François, B.

doi:10.1051/jcp/1992891331

Cited by 13 publications

(3 citation statements)

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“…Indeed, CS 2 is a selective solvent for PS so that an aggregation process generally takes place. In particular, PS-PPP forms quasispherical micellar aggregates composed of a solid PPP core (30-150Å) surrounded by a shell of PS sequences [3]. The star-polymer morphology is believed to be a determinant element in the mechanism of formation of the honeycomb structure, all the more because disordered membranes were obtained from usual linear polystyrenes.…”

Section: Introductionmentioning

confidence: 99%

Formation of ordered micro-porous membranes

1999

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Regular micro-porous polymeric membranes have recently been discovered by rapidly evaporating a solution of CS2 containing poly(p-phenylene)-block-polystyrene [1]. 1,2-dichloroethane (a chlorated solvent in which polystyrene gel phase has never been observed) is also found to produce ordered structures, which definitively excludes eventual effect of the gelation process during the membrane formation. The observation of the solution surface during the solvent evaporation reveals the growing of micron-sized water droplets trapped at the surface and forming compact aggregates. The study of the solution/water interface shows that the water droplets profile is in agreement with the pore shape observed in the membranes. Moreover, the copolymer was found to precipitate at the interface, forming a layer encapsulating the droplets and preventing their coalescence. In that way, the final structure results from the droplets stacking under the action of large surface currents. Finally, we argue that the decisive element in the formation of ordered structures is the ability of the polymer to precipitate at the solution/water interface, which seems to be related the star-polymer microstructure.

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Section: Introductionmentioning

confidence: 99%

Formation of ordered micro-porous membranes

1999

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“…Block copolymers can improve mechanical and optoelectronic properties, compared to individual component homopolymers, by forming well-defined macrostructures based on stable, chemically inter-linked macrodomains. 17 PPP-PS has been shown to form micelles in a wide range of organic solvents with PPP "cores" surrounded by PS "shells" , [18][19][20][21][22] and thin films of PPP-PS-PPP self-organize into a honeycomblike morphology 23 presenting promising photo-and electroluminescence properties. 20,22,24,25 The synthesis of star copolymers consisting of PCHD, about divinylbenzene 26,27 or trichloromethylsilane 28 cores, has led to the possibility of preparing three-dimensional copolymers containing PPP which may display novel properties.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Star Copolymers Consisting of Fullerene and Conjugated Polyphenylene: 6-star-C₆₀[styrene−poly(1,4-phenylene)-block-polystyrene] and 6-star-C₆₀[polystyrene-block-poly(1,4-phenylene)]

2002

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The grafting of "living" polystyrene-block-poly(1,3-cyclohexadiene)-block-styryllithium and poly(1,3-cylclohexadiene)-block-polystyryllithium onto C 60 yielded, respectively, 6-star-fullerene[styreneblock-poly(1,3-cyclohexadiene)-block-polystyrene] and 6-star-fullerene[polystyrene-block-poly(1,3-cyclohexadiene)]. Selective dehydrogenation of these macromolecules yielded, respectively, 6-star-fullerene-[styrene-block-poly(1,4-phenylene)-block-polystyrene], C60(st-PPP-PS)6, and 6-star-fullerene [polystyreneblock-poly(1,4-phenylene)], C60(PS-PPP)6. 6-star-Fullerene[poly(1,4-phenylene)-block-polystyrene] could not be synthesized via this route as fullerene-poly(1,3-cyclohexadiene) bonds were found to form without control and to degrade during aromatization. Star copolymers containing conjugated PPP were characterized by size exclusion chromatography, UV, and fluorescence spectroscopy. Fluorescence quantum yields of C 60(st-PPP-PS)6 and C60(PS-PPP)6 in THF were compared and discussed in light of characterizations of PPP-PS-PPP in comparable conditions without or mixed with C60(PS)6.

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Advanced syntheses and microfabrications of conjugated polymers, C60-containing polymers and carbon nanotubes for optoelectronic applications

Dai

1999

Polym. Adv. Technol.

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Étude de l’agrégation des copolymères séquences polystyrène-polyparaphénylène par diffusion de la lumière et des neutrons

Cited by 13 publications

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Formation of ordered micro-porous membranes

Formation of ordered micro-porous membranes

Synthesis and Characterization of Star Copolymers Consisting of Fullerene and Conjugated Polyphenylene: 6-star-C₆₀[styrene−poly(1,4-phenylene)-block-polystyrene] and 6-star-C₆₀[polystyrene-block-poly(1,4-phenylene)]

Advanced syntheses and microfabrications of conjugated polymers, C60-containing polymers and carbon nanotubes for optoelectronic applications

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Étude de l’agrégation des copolymères séquences polystyrène-polyparaphénylène par diffusion de la lumière et des neutrons

Cited by 13 publications

References 0 publications

Formation of ordered micro-porous membranes

Formation of ordered micro-porous membranes

Synthesis and Characterization of Star Copolymers Consisting of Fullerene and Conjugated Polyphenylene: 6-star-C60[styrene−poly(1,4-phenylene)-block-polystyrene] and 6-star-C60[polystyrene-block-poly(1,4-phenylene)]

Advanced syntheses and microfabrications of conjugated polymers, C60-containing polymers and carbon nanotubes for optoelectronic applications

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Synthesis and Characterization of Star Copolymers Consisting of Fullerene and Conjugated Polyphenylene: 6-star-C₆₀[styrene−poly(1,4-phenylene)-block-polystyrene] and 6-star-C₆₀[polystyrene-block-poly(1,4-phenylene)]