Description d'une chambre de diffusion des rayons X aux petits angles à collimation linéaire

Luzzati, Vittorio; Baro, Robert Alexander Jones

doi:10.1051/jphysap:019610022011018600

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…The polymers used were synthesized anionically in benzene at 25 °C with sec-butyllithium as the initiator. 23 Their molecular characteristics (Table I) were carefully determined following the usual physicochemical methods.…”

Section: Methodsmentioning

confidence: 99%

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Molecular weight dependence of lamellar structure in styrene isoprene two- and three-block copolymers

Hadziioannou¹,

Skoulios²

1982

Macromolecules

127

126

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The lamellar structure of three homologous series of SI, SIS, and ISI block copolymers, 50% by weight polystyrene, was studied as a function of molecular weight with low-angle X-ray diffraction. From the structural standpoint, the three-block copolymers behave identically with the corresponding two-block copolymers of half the molecular weight. Helfand's thermodynamic predictions for the value of the lamellar thickness are in fair numerical agreement with the experimental facts; however, the observed lamellar spacing increases with molecular weight a little more steeply than predicted. Finally, the molecular area, calculated from Helfand's theory as a function of chemical composition at constant lamellar thickness, is independent of the exact position of the interface within the lamella. The general impression is that for two-block copolymers the arrangement of the sequences in the lamellae would be close to a double-layer arrangement. This would imply little interpenetration of the molecules in a direction normal to the interfaces.

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Section: Methodsmentioning

confidence: 99%

“…The X-ray diffraction experiments were carried out with a Baro-Luzzati small-angle camera. 25 This was equipped with a bent quartz monochromator and was operated under vacuum using Cu K«! radiation.…”

Section: Methodsmentioning

confidence: 99%

Molecular weight dependence of lamellar structure in styrene isoprene two- and three-block copolymers

Hadziioannou¹,

Skoulios²

1982

Macromolecules

127

126

View full text Add to dashboard Cite

show abstract

Crystalline changes in native wheat and potato starches at intermediate water levels during gelatinization

Svensson

Eliasson

1995

Carbohydrate Polymers

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Experimental separation of Kα1 and Kα2 components in X-ray line profile analysis

Tanninen

1983

Nuclear Instruments and Methods in Physics Research

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Description d'une chambre de diffusion des rayons X aux petits angles à collimation linéaire

Abstract: . Réumé. — On décrit une chambre de diffusion des rayons X aux petits angles, basée sur l'emploi d'un monochromateur à lame de quartz courbée, opérant sous vide

Cited by 4 publications

References 5 publications

Molecular weight dependence of lamellar structure in styrene isoprene two- and three-block copolymers

Molecular weight dependence of lamellar structure in styrene isoprene two- and three-block copolymers

Crystalline changes in native wheat and potato starches at intermediate water levels during gelatinization

Experimental separation of Kα1 and Kα2 components in X-ray line profile analysis

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