Evaluation of molecular volume change of block copolymer depending on temperature: A SANS study

Tae Hwan Kim; Changwoo Do; Young Soo Han

doi:10.1016/j.physb.2017.12.059

Evaluation of molecular volume change of block copolymer depending on temperature: A SANS study

Tae Hwan Kim, Changwoo Do, Young Soo Han

Large Scale Structures

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1 Scopus citations

Abstract

Amphiphilic Pluronic triblock copolymers form various self-assembled structures such as sphere, cylinder, lamellae and so on, depending on temperature, leading to the increase of hydrophobicity of block copolymers. However, the effective molecular volume change of the block copolymer has not been fully exploited yet, when temperature increases. Here, we have investigated the effective molecular volume change of the block copolymer upon heating by using the contrast variation small angle neutron scattering. The scattering length densities (SLDs) of the block copolymer were experimentally obtained from the neutron scattering contrast variation method between the solvent and the block copolymer at varying temperature. Even though the SLD, which is the intrinsic property of the material, should not be changed by temperature elevation, it was dependent on temperature, indicating that the molecular volume is changed. Therefore, we obtained the increase rate of the molecular volume change of the block copolymer (the effective molecular volume change) from the comparison of the calculated SLD and the standard SLD, which is evaluated by plotting the SANS intensity at the first order Bragg peak as the function of temperature at each volume fraction of D₂O and H₂O that is about 25.5%–51.3% depending on temperature.

Original language	English
Pages (from-to)	179-183
Number of pages	5
Journal	Physica B: Physics of Condensed Matter
Volume	551
DOIs	https://doi.org/10.1016/j.physb.2017.12.059
State	Published - Dec 15 2018

Funding

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ( NRF-2017R1D1A3B03028827 ) and “Research Base Construction Fund Support Program” funded by Chonbuk National University in 2017 . The Research at Oak Ridge National Laboratory's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy .

Funders	Funder number
Scientific User Facilities Division
U.S. Department of Energy
Basic Energy Sciences
Oak Ridge National Laboratory
Chonbuk National University
Ministry of Education	NRF-2017R1D1A3B03028827
National Research Foundation of Korea

Keywords

Block copolymer and self-assembly
Neutron contrast variation
Phase behavior
Small angle neutron scattering (SANS)

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10.1016/j.physb.2017.12.059

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title = "Evaluation of molecular volume change of block copolymer depending on temperature: A SANS study",

abstract = "Amphiphilic Pluronic triblock copolymers form various self-assembled structures such as sphere, cylinder, lamellae and so on, depending on temperature, leading to the increase of hydrophobicity of block copolymers. However, the effective molecular volume change of the block copolymer has not been fully exploited yet, when temperature increases. Here, we have investigated the effective molecular volume change of the block copolymer upon heating by using the contrast variation small angle neutron scattering. The scattering length densities (SLDs) of the block copolymer were experimentally obtained from the neutron scattering contrast variation method between the solvent and the block copolymer at varying temperature. Even though the SLD, which is the intrinsic property of the material, should not be changed by temperature elevation, it was dependent on temperature, indicating that the molecular volume is changed. Therefore, we obtained the increase rate of the molecular volume change of the block copolymer (the effective molecular volume change) from the comparison of the calculated SLD and the standard SLD, which is evaluated by plotting the SANS intensity at the first order Bragg peak as the function of temperature at each volume fraction of D2O and H2O that is about 25.5%–51.3% depending on temperature.",

keywords = "Block copolymer and self-assembly, Neutron contrast variation, Phase behavior, Small angle neutron scattering (SANS)",

author = "Kim, {Tae Hwan} and Changwoo Do and Han, {Young Soo}",

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doi = "10.1016/j.physb.2017.12.059",

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T2 - A SANS study

AU - Kim, Tae Hwan

AU - Do, Changwoo

AU - Han, Young Soo

PY - 2018/12/15

Y1 - 2018/12/15

N2 - Amphiphilic Pluronic triblock copolymers form various self-assembled structures such as sphere, cylinder, lamellae and so on, depending on temperature, leading to the increase of hydrophobicity of block copolymers. However, the effective molecular volume change of the block copolymer has not been fully exploited yet, when temperature increases. Here, we have investigated the effective molecular volume change of the block copolymer upon heating by using the contrast variation small angle neutron scattering. The scattering length densities (SLDs) of the block copolymer were experimentally obtained from the neutron scattering contrast variation method between the solvent and the block copolymer at varying temperature. Even though the SLD, which is the intrinsic property of the material, should not be changed by temperature elevation, it was dependent on temperature, indicating that the molecular volume is changed. Therefore, we obtained the increase rate of the molecular volume change of the block copolymer (the effective molecular volume change) from the comparison of the calculated SLD and the standard SLD, which is evaluated by plotting the SANS intensity at the first order Bragg peak as the function of temperature at each volume fraction of D2O and H2O that is about 25.5%–51.3% depending on temperature.

AB - Amphiphilic Pluronic triblock copolymers form various self-assembled structures such as sphere, cylinder, lamellae and so on, depending on temperature, leading to the increase of hydrophobicity of block copolymers. However, the effective molecular volume change of the block copolymer has not been fully exploited yet, when temperature increases. Here, we have investigated the effective molecular volume change of the block copolymer upon heating by using the contrast variation small angle neutron scattering. The scattering length densities (SLDs) of the block copolymer were experimentally obtained from the neutron scattering contrast variation method between the solvent and the block copolymer at varying temperature. Even though the SLD, which is the intrinsic property of the material, should not be changed by temperature elevation, it was dependent on temperature, indicating that the molecular volume is changed. Therefore, we obtained the increase rate of the molecular volume change of the block copolymer (the effective molecular volume change) from the comparison of the calculated SLD and the standard SLD, which is evaluated by plotting the SANS intensity at the first order Bragg peak as the function of temperature at each volume fraction of D2O and H2O that is about 25.5%–51.3% depending on temperature.

KW - Block copolymer and self-assembly

KW - Neutron contrast variation

KW - Phase behavior

KW - Small angle neutron scattering (SANS)

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Evaluation of molecular volume change of block copolymer depending on temperature: A SANS study

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