Dynamic structure factor of diblock copolymer solutions in the disordered state. 2. Effect of composition polydispersity

P. Holmqvist; S. Pispas; R. Sigel; N. Hadjichristidis; G. Fytas

doi:10.1021/ma0119068

Dynamic structure factor of diblock copolymer solutions in the disordered state. 2. Effect of composition polydispersity

P. Holmqvist, S. Pispas, R. Sigel, N. Hadjichristidis^*, G. Fytas

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The dynamic structure factor of entangled solutions of one symmetric and two asymmetric high molar mass styrene-b-ethylene-alt-propylene (SEP) and the parent styrene-b-isoprene (SI) diblock copolymers in the common solvent toluene was thoroughly studied by photon correlation spectroscopy. The incomplete hydrogenation transforms the I-block of SI into a random heteropolymer block. In turns out that this acts as enhanced composition polydispersity on both static and dynamic structure factor. In the mean-field regime of the disordered phase, the decay of the composition fluctuations in SI and SEP changes from a pure relaxational (q-independent rate) for SI to a pure diffusive (q²-dependent rate) character for SEP in a controlled way.

Original language	English (US)
Pages (from-to)	3157-3163
Number of pages	7
Journal	Macromolecules
Volume	35
Issue number	8
DOIs	https://doi.org/10.1021/ma0119068
State	Published - Apr 9 2002
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Dynamic structure factor of diblock copolymer solutions in the disordered state. 2. Effect of composition polydispersity",

abstract = "The dynamic structure factor of entangled solutions of one symmetric and two asymmetric high molar mass styrene-b-ethylene-alt-propylene (SEP) and the parent styrene-b-isoprene (SI) diblock copolymers in the common solvent toluene was thoroughly studied by photon correlation spectroscopy. The incomplete hydrogenation transforms the I-block of SI into a random heteropolymer block. In turns out that this acts as enhanced composition polydispersity on both static and dynamic structure factor. In the mean-field regime of the disordered phase, the decay of the composition fluctuations in SI and SEP changes from a pure relaxational (q-independent rate) for SI to a pure diffusive (q2-dependent rate) character for SEP in a controlled way.",

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AU - Holmqvist, P.

AU - Pispas, S.

AU - Sigel, R.

AU - Hadjichristidis, N.

AU - Fytas, G.

PY - 2002/4/9

Y1 - 2002/4/9

N2 - The dynamic structure factor of entangled solutions of one symmetric and two asymmetric high molar mass styrene-b-ethylene-alt-propylene (SEP) and the parent styrene-b-isoprene (SI) diblock copolymers in the common solvent toluene was thoroughly studied by photon correlation spectroscopy. The incomplete hydrogenation transforms the I-block of SI into a random heteropolymer block. In turns out that this acts as enhanced composition polydispersity on both static and dynamic structure factor. In the mean-field regime of the disordered phase, the decay of the composition fluctuations in SI and SEP changes from a pure relaxational (q-independent rate) for SI to a pure diffusive (q2-dependent rate) character for SEP in a controlled way.

AB - The dynamic structure factor of entangled solutions of one symmetric and two asymmetric high molar mass styrene-b-ethylene-alt-propylene (SEP) and the parent styrene-b-isoprene (SI) diblock copolymers in the common solvent toluene was thoroughly studied by photon correlation spectroscopy. The incomplete hydrogenation transforms the I-block of SI into a random heteropolymer block. In turns out that this acts as enhanced composition polydispersity on both static and dynamic structure factor. In the mean-field regime of the disordered phase, the decay of the composition fluctuations in SI and SEP changes from a pure relaxational (q-independent rate) for SI to a pure diffusive (q2-dependent rate) character for SEP in a controlled way.

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JO - Macromolecules

JF - Macromolecules

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Dynamic structure factor of diblock copolymer solutions in the disordered state. 2. Effect of composition polydispersity

Abstract

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