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

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 in this paper, 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 D 2O and H 2O that is about 25.5%–51.3% depending onmore » temperature.« less
Authors:
 [1] ; ORCiD logo [2] ;  [3]
  1. Chonbuk National Univ., Jeonju (Korea, Republic of). Dept. of Quantum System Engineering; Korea Atomic Energy Research Inst., Yuseong-gu, Daejeon (Korea, Republic of). Neutron Science Division, Research Reactor Utilization Dept.
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biology and Soft Matter Division
  3. Korea Atomic Energy Research Inst., Yuseong-gu, Daejeon (Korea, Republic of). Neutron Science Division, Research Reactor Utilization Dept.
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physica. B, Condensed Matter
Additional Journal Information:
Journal Name: Physica. B, Condensed Matter; Journal ID: ISSN 0921-4526
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; National Research Foundation of Korea (NRF); Chonbuk National University; Ministry of Education
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Small angle neutron scattering (SANS); Neutron contrast variation; Phase behavior; Block copolymer and self-assembly
OSTI Identifier:
1422542