Dynamic light scattering study on a bimodal end-linked polydimethylsiloxane network structure

Hidetoshi Oikawa

doi:10.1016/0032-3861(92)90035-U

Dynamic light scattering study on a bimodal end-linked polydimethylsiloxane network structure

Hidetoshi Oikawa

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

26 Citations (Scopus)

Abstract

The cooperative diffusion coefficient D_coop and the normalized variance μ₂ \ ̄qG^-2 for bimodal end-linked polydimethylsiloxane (PDMS) networks were determined by means of dynamic light scattering (DLS) measurements. D_coop was proportional to polymer weight concentration at the equilibrium state of swelling C_e to the power of 0.88, which was larger than the theoretical exponent, compared with the unimodal PDMS networks. Further, the value of μ₂ \ ̄qG^-2 at the lowest C_e was greater than that of the corresponding bimodal PDMS solutions in the semidilute regime, and the autocorrelation function of DLS could be reproduced by a double-exponential fitting. These facts suggested a spatially and compositionally heterogeneous structure of bimodal PDMS networks, especially in the case of the lowest C_e.

Original language	English
Pages (from-to)	1116-1119
Number of pages	4
Journal	Polymer
Volume	33
Issue number	5
DOIs	https://doi.org/10.1016/0032-3861(92)90035-U
Publication status	Published - 1992

Keywords

bimodal network
dynamic light scattering
polydimethylsiloxane

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/0032-3861(92)90035-U

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title = "Dynamic light scattering study on a bimodal end-linked polydimethylsiloxane network structure",

abstract = "The cooperative diffusion coefficient Dcoop and the normalized variance μ2 \{\= }qG-2 for bimodal end-linked polydimethylsiloxane (PDMS) networks were determined by means of dynamic light scattering (DLS) measurements. Dcoop was proportional to polymer weight concentration at the equilibrium state of swelling Ce to the power of 0.88, which was larger than the theoretical exponent, compared with the unimodal PDMS networks. Further, the value of μ2 \{\= }qG-2 at the lowest Ce was greater than that of the corresponding bimodal PDMS solutions in the semidilute regime, and the autocorrelation function of DLS could be reproduced by a double-exponential fitting. These facts suggested a spatially and compositionally heterogeneous structure of bimodal PDMS networks, especially in the case of the lowest Ce.",

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T1 - Dynamic light scattering study on a bimodal end-linked polydimethylsiloxane network structure

AU - Oikawa, Hidetoshi

PY - 1992

Y1 - 1992

N2 - The cooperative diffusion coefficient Dcoop and the normalized variance μ2 \ ̄qG-2 for bimodal end-linked polydimethylsiloxane (PDMS) networks were determined by means of dynamic light scattering (DLS) measurements. Dcoop was proportional to polymer weight concentration at the equilibrium state of swelling Ce to the power of 0.88, which was larger than the theoretical exponent, compared with the unimodal PDMS networks. Further, the value of μ2 \ ̄qG-2 at the lowest Ce was greater than that of the corresponding bimodal PDMS solutions in the semidilute regime, and the autocorrelation function of DLS could be reproduced by a double-exponential fitting. These facts suggested a spatially and compositionally heterogeneous structure of bimodal PDMS networks, especially in the case of the lowest Ce.

AB - The cooperative diffusion coefficient Dcoop and the normalized variance μ2 \ ̄qG-2 for bimodal end-linked polydimethylsiloxane (PDMS) networks were determined by means of dynamic light scattering (DLS) measurements. Dcoop was proportional to polymer weight concentration at the equilibrium state of swelling Ce to the power of 0.88, which was larger than the theoretical exponent, compared with the unimodal PDMS networks. Further, the value of μ2 \ ̄qG-2 at the lowest Ce was greater than that of the corresponding bimodal PDMS solutions in the semidilute regime, and the autocorrelation function of DLS could be reproduced by a double-exponential fitting. These facts suggested a spatially and compositionally heterogeneous structure of bimodal PDMS networks, especially in the case of the lowest Ce.

KW - bimodal network

KW - dynamic light scattering

KW - polydimethylsiloxane

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Dynamic light scattering study on a bimodal end-linked polydimethylsiloxane network structure

Abstract

Keywords

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