Anomaly in SANS χ for polydisperse polystyrene-b-poly(isooctyl acrylate)

Jumi Lee; Hyungju Ahn; Du Yeol Ryu; Kwanwoo Shin; Junhan Cho

doi:10.1016/j.polymer.2012.03.051

Anomaly in SANS χ for polydisperse polystyrene-b-poly(isooctyl acrylate)

Jumi Lee, Hyungju Ahn, Du Yeol Ryu, Kwanwoo Shin, Junhan Cho

Department of Chemical and Biomolecular Engineering

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

Abstract

Small-angle neutron scattering (SANS) measurements have been performed on a disordered block copolymer from deuterated polystyrene (dPS) and self-adhesive poly(isooctyl acrylate) (POA) in order to elicit the effective Flory-Huggins χ, which carries the essence of the copolymer phase behavior. The copolymer sample for the measurement was prepared by blending two polydisperse dPS-b-POAs of different molecular weights, where the overall average size of the blend was low enough to ensure to be in the mean-field region but high enough to have discernible scattering intensities. The SANS profiles for the copolymer were fitted to Leibler's scattering function for a polydisperse copolymer system described by Schulz-Zimm distribution. The resultant χ as a function of inverse temperature was shown to have a strong entropic contribution and a weak enthalpic contribution. By adopting Sanchez-Balasz or ten Brinke-Karasz-type simple analysis for specific interactions, it was found that the entropically dominated χ for dPS-b-POA arises from the steric hindrance of long alkyl side groups of POA.

Original language	English
Pages (from-to)	2495-2499
Number of pages	5
Journal	polymer
Volume	53
Issue number	12
DOIs	https://doi.org/10.1016/j.polymer.2012.03.051
Publication status	Published - 2012 May 25

Bibliographical note

Funding Information:
This work has been supported by collaborative R&D program with technology advanced country [ 2011-advanced-B-015 ]. J. C. also acknowledges the support from Center for Photofunctional Energy Materials through Gyeonggi Regional Research Center program [ GRRC dankook2011-B04 ].

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/j.polymer.2012.03.051

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title = "Anomaly in SANS χ for polydisperse polystyrene-b-poly(isooctyl acrylate)",

abstract = "Small-angle neutron scattering (SANS) measurements have been performed on a disordered block copolymer from deuterated polystyrene (dPS) and self-adhesive poly(isooctyl acrylate) (POA) in order to elicit the effective Flory-Huggins χ, which carries the essence of the copolymer phase behavior. The copolymer sample for the measurement was prepared by blending two polydisperse dPS-b-POAs of different molecular weights, where the overall average size of the blend was low enough to ensure to be in the mean-field region but high enough to have discernible scattering intensities. The SANS profiles for the copolymer were fitted to Leibler's scattering function for a polydisperse copolymer system described by Schulz-Zimm distribution. The resultant χ as a function of inverse temperature was shown to have a strong entropic contribution and a weak enthalpic contribution. By adopting Sanchez-Balasz or ten Brinke-Karasz-type simple analysis for specific interactions, it was found that the entropically dominated χ for dPS-b-POA arises from the steric hindrance of long alkyl side groups of POA.",

author = "Jumi Lee and Hyungju Ahn and Ryu, {Du Yeol} and Kwanwoo Shin and Junhan Cho",

note = "Funding Information: This work has been supported by collaborative R&D program with technology advanced country [ 2011-advanced-B-015 ]. J. C. also acknowledges the support from Center for Photofunctional Energy Materials through Gyeonggi Regional Research Center program [ GRRC dankook2011-B04 ]. ",

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doi = "10.1016/j.polymer.2012.03.051",

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AU - Shin, Kwanwoo

AU - Cho, Junhan

N1 - Funding Information: This work has been supported by collaborative R&D program with technology advanced country [ 2011-advanced-B-015 ]. J. C. also acknowledges the support from Center for Photofunctional Energy Materials through Gyeonggi Regional Research Center program [ GRRC dankook2011-B04 ].

PY - 2012/5/25

Y1 - 2012/5/25

N2 - Small-angle neutron scattering (SANS) measurements have been performed on a disordered block copolymer from deuterated polystyrene (dPS) and self-adhesive poly(isooctyl acrylate) (POA) in order to elicit the effective Flory-Huggins χ, which carries the essence of the copolymer phase behavior. The copolymer sample for the measurement was prepared by blending two polydisperse dPS-b-POAs of different molecular weights, where the overall average size of the blend was low enough to ensure to be in the mean-field region but high enough to have discernible scattering intensities. The SANS profiles for the copolymer were fitted to Leibler's scattering function for a polydisperse copolymer system described by Schulz-Zimm distribution. The resultant χ as a function of inverse temperature was shown to have a strong entropic contribution and a weak enthalpic contribution. By adopting Sanchez-Balasz or ten Brinke-Karasz-type simple analysis for specific interactions, it was found that the entropically dominated χ for dPS-b-POA arises from the steric hindrance of long alkyl side groups of POA.

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Anomaly in SANS χ for polydisperse polystyrene-b-poly(isooctyl acrylate)

Abstract

Bibliographical note

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