Dynamic light scattering from semidilute solutions of a styrene-acrylonitrile random copolymer

Haifeng Zheng, Iwao Teraoka

Research output: Contribution to journalArticle

Abstract

Dynamics of a random copolymer, poly(styrene-co-acrylonitrile), in dilute and semidilute solutions was studied by using dynamic light scattering. The solvent used was a mixture of dioxane and acetonitrile (ACN). The mixing ratio and the temperature were changed to provide the copolymer with various solvent conditions that range from a good to a ⊖ solvent. At low ACN contents, the autocorrelation function of the light scattering intensity had a single relaxation mode. Its diffusion changed from the mutual diffusion to the cooperative diffusion of entangled chains in the good solvent as the concentration c increased. At high ACN contents (near ⊖), the diffusion coefficient decreased to 1/3 of the dilute solution value and the scattering intensity increased almost linearly with c, before the diffusion coefficient turned to increase as ∼c and the scattering intensity to decrease as ∼c-1, indicating the cooperative diffusion of entangled ⊖ chains. In this high concentration range, the autocorrelation function exhibited a slow diffusion mode as well. A high friction coefficient and an extended near-linear range in the scattering intensity, especially at low temperatures, suggest dynamic clustering of chains upon increasing the concentration.

Original languageEnglish (US)
Pages (from-to)6074-6082
Number of pages9
JournalMacromolecules
Volume34
Issue number17
DOIs
StatePublished - Aug 14 2001

Fingerprint

Acrylonitrile
Styrene
Dynamic light scattering
Copolymers
Acetonitrile
Scattering
Autocorrelation
Light scattering
Friction
Temperature

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Dynamic light scattering from semidilute solutions of a styrene-acrylonitrile random copolymer. / Zheng, Haifeng; Teraoka, Iwao.

In: Macromolecules, Vol. 34, No. 17, 14.08.2001, p. 6074-6082.

Research output: Contribution to journalArticle

@article{24678d0f803e4d648396b4e7ded75bb2,
title = "Dynamic light scattering from semidilute solutions of a styrene-acrylonitrile random copolymer",
abstract = "Dynamics of a random copolymer, poly(styrene-co-acrylonitrile), in dilute and semidilute solutions was studied by using dynamic light scattering. The solvent used was a mixture of dioxane and acetonitrile (ACN). The mixing ratio and the temperature were changed to provide the copolymer with various solvent conditions that range from a good to a ⊖ solvent. At low ACN contents, the autocorrelation function of the light scattering intensity had a single relaxation mode. Its diffusion changed from the mutual diffusion to the cooperative diffusion of entangled chains in the good solvent as the concentration c increased. At high ACN contents (near ⊖), the diffusion coefficient decreased to 1/3 of the dilute solution value and the scattering intensity increased almost linearly with c, before the diffusion coefficient turned to increase as ∼c and the scattering intensity to decrease as ∼c-1, indicating the cooperative diffusion of entangled ⊖ chains. In this high concentration range, the autocorrelation function exhibited a slow diffusion mode as well. A high friction coefficient and an extended near-linear range in the scattering intensity, especially at low temperatures, suggest dynamic clustering of chains upon increasing the concentration.",
author = "Haifeng Zheng and Iwao Teraoka",
year = "2001",
month = "8",
day = "14",
doi = "10.1021/ma001646e",
language = "English (US)",
volume = "34",
pages = "6074--6082",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "17",

}

TY - JOUR

T1 - Dynamic light scattering from semidilute solutions of a styrene-acrylonitrile random copolymer

AU - Zheng, Haifeng

AU - Teraoka, Iwao

PY - 2001/8/14

Y1 - 2001/8/14

N2 - Dynamics of a random copolymer, poly(styrene-co-acrylonitrile), in dilute and semidilute solutions was studied by using dynamic light scattering. The solvent used was a mixture of dioxane and acetonitrile (ACN). The mixing ratio and the temperature were changed to provide the copolymer with various solvent conditions that range from a good to a ⊖ solvent. At low ACN contents, the autocorrelation function of the light scattering intensity had a single relaxation mode. Its diffusion changed from the mutual diffusion to the cooperative diffusion of entangled chains in the good solvent as the concentration c increased. At high ACN contents (near ⊖), the diffusion coefficient decreased to 1/3 of the dilute solution value and the scattering intensity increased almost linearly with c, before the diffusion coefficient turned to increase as ∼c and the scattering intensity to decrease as ∼c-1, indicating the cooperative diffusion of entangled ⊖ chains. In this high concentration range, the autocorrelation function exhibited a slow diffusion mode as well. A high friction coefficient and an extended near-linear range in the scattering intensity, especially at low temperatures, suggest dynamic clustering of chains upon increasing the concentration.

AB - Dynamics of a random copolymer, poly(styrene-co-acrylonitrile), in dilute and semidilute solutions was studied by using dynamic light scattering. The solvent used was a mixture of dioxane and acetonitrile (ACN). The mixing ratio and the temperature were changed to provide the copolymer with various solvent conditions that range from a good to a ⊖ solvent. At low ACN contents, the autocorrelation function of the light scattering intensity had a single relaxation mode. Its diffusion changed from the mutual diffusion to the cooperative diffusion of entangled chains in the good solvent as the concentration c increased. At high ACN contents (near ⊖), the diffusion coefficient decreased to 1/3 of the dilute solution value and the scattering intensity increased almost linearly with c, before the diffusion coefficient turned to increase as ∼c and the scattering intensity to decrease as ∼c-1, indicating the cooperative diffusion of entangled ⊖ chains. In this high concentration range, the autocorrelation function exhibited a slow diffusion mode as well. A high friction coefficient and an extended near-linear range in the scattering intensity, especially at low temperatures, suggest dynamic clustering of chains upon increasing the concentration.

UR - http://www.scopus.com/inward/record.url?scp=0035860052&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035860052&partnerID=8YFLogxK

U2 - 10.1021/ma001646e

DO - 10.1021/ma001646e

M3 - Article

AN - SCOPUS:0035860052

VL - 34

SP - 6074

EP - 6082

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 17

ER -