skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Conformation and Phase Separation of Oligo (ethylene glycol) Grafted Polystyrene in Dilute Aqueous Solutions

Abstract

Temperature induced conformational changes of poly(p-oligo(ethylene glycol) styrene) (POEGS) in aqueous solutions were investigated by small angle neutron scattering (SANS), neutron transmission and dynamic light scattering (DLS). The molecular weight of the polymer studied was 9400 g/mol with a polydispersity index of 1.18 and each repeat unit of the polymer had four ethylene glycol monomer segments. The polymer was water soluble due to the hydrophilicity of the OEG side chains and these solutions showed lower critical solution temperature (LCST) depending on the concentration of the polymer. Measurements of solution behavior were made as a function of temperature in the range of 25-55 C for three polymer concentrations (0.1 wt%, 0.3 wt%, and 1.8 wt%). Neutron transmission measurements were used to monitor the amount of polymer which precipitated or remained in solution above the cloud point temperature (T{sub CP}). DLS revealed the presence of large clusters in all solutions both below and above T{sub CP} while SANS provided information on the structure and interactions between individual chains. It was found that in the homogeneous region below T{sub CP} the shape of individual polymers in solution was close to ellipsoidal with the dimensions R{sub a} = 37 Angstroms and R{sub b} =more » 14 Angstroms and was virtually independent of temperature. The SANS data taken for the most concentrated solution studied (1.8 wt%) were fit to the ellipsoidal model with attractive interactions which were approximated by the Ornstein-Zernike function with a temperature-dependent correlation length in the range of 24-49 Angstroms. The collapse of individual polymers to spherical globules with the radius of 15 Angstroms above TCP was observed.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Center for Nanophase Materials Sciences
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
931735
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Polymer; Journal Volume: 48
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AQUEOUS SOLUTIONS; CONFORMATIONAL CHANGES; GLYCOLS; MOLECULAR WEIGHT; POLYSTYRENE; TEMPERATURE DEPENDENCE

Citation Formats

Cheng, Gang, Melnichenko, Yuri B, Wignall, George D, Hua, Fengjun, Hong, Kunlun, and Mays, Jimmy. Conformation and Phase Separation of Oligo (ethylene glycol) Grafted Polystyrene in Dilute Aqueous Solutions. United States: N. p., 2007. Web. doi:10.1016/j.polymer.2007.05.016.
Cheng, Gang, Melnichenko, Yuri B, Wignall, George D, Hua, Fengjun, Hong, Kunlun, & Mays, Jimmy. Conformation and Phase Separation of Oligo (ethylene glycol) Grafted Polystyrene in Dilute Aqueous Solutions. United States. doi:10.1016/j.polymer.2007.05.016.
Cheng, Gang, Melnichenko, Yuri B, Wignall, George D, Hua, Fengjun, Hong, Kunlun, and Mays, Jimmy. Mon . "Conformation and Phase Separation of Oligo (ethylene glycol) Grafted Polystyrene in Dilute Aqueous Solutions". United States. doi:10.1016/j.polymer.2007.05.016.
@article{osti_931735,
title = {Conformation and Phase Separation of Oligo (ethylene glycol) Grafted Polystyrene in Dilute Aqueous Solutions},
author = {Cheng, Gang and Melnichenko, Yuri B and Wignall, George D and Hua, Fengjun and Hong, Kunlun and Mays, Jimmy},
abstractNote = {Temperature induced conformational changes of poly(p-oligo(ethylene glycol) styrene) (POEGS) in aqueous solutions were investigated by small angle neutron scattering (SANS), neutron transmission and dynamic light scattering (DLS). The molecular weight of the polymer studied was 9400 g/mol with a polydispersity index of 1.18 and each repeat unit of the polymer had four ethylene glycol monomer segments. The polymer was water soluble due to the hydrophilicity of the OEG side chains and these solutions showed lower critical solution temperature (LCST) depending on the concentration of the polymer. Measurements of solution behavior were made as a function of temperature in the range of 25-55 C for three polymer concentrations (0.1 wt%, 0.3 wt%, and 1.8 wt%). Neutron transmission measurements were used to monitor the amount of polymer which precipitated or remained in solution above the cloud point temperature (T{sub CP}). DLS revealed the presence of large clusters in all solutions both below and above T{sub CP} while SANS provided information on the structure and interactions between individual chains. It was found that in the homogeneous region below T{sub CP} the shape of individual polymers in solution was close to ellipsoidal with the dimensions R{sub a} = 37 Angstroms and R{sub b} = 14 Angstroms and was virtually independent of temperature. The SANS data taken for the most concentrated solution studied (1.8 wt%) were fit to the ellipsoidal model with attractive interactions which were approximated by the Ornstein-Zernike function with a temperature-dependent correlation length in the range of 24-49 Angstroms. The collapse of individual polymers to spherical globules with the radius of 15 Angstroms above TCP was observed.},
doi = {10.1016/j.polymer.2007.05.016},
journal = {Polymer},
number = ,
volume = 48,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}