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Title: Structural Analysis of Ultrasoft PDMS-g-PDMS Shell-Only Particles

Abstract

We have used anionic polymerization to synthesize polymers of linear and bottlebrush architecture each with a polydimethylsiloxane backbone. The blending of polymer architectures has the effect of changing material properties, e.g., the viscoelasticity, which are connected to the chain conformation. Thus, we explore the conformation of bottlebrush polymers in a linear host melt both as a function of the concentration and for various molecular weights of the linear host matrices. Our bottlebrush polymers are seen as shell-only particles with a negligible core size. We find a substantial influence of the molecular weight of the linear matrices on the structure of the bottlebrushes and their interactions. In samples with a low molecular weight matrix that have the same degree of polymerization as the side chains, the bottlebrush behavior is consistent with an effective theta solvent condition for all concentrations. With increasing molecular weight of the host matrix, this condition is only reached at the highest concentration of the bottlebrush polymers. The increase of the molecular weight of the host matrix leads to a shrinkage of the bottlebrushes and subsequently to a formation of clusters at higher volume fractions. None of the scattering patterns show a pronounced correlation peak; however, decreased forwardmore » scattering associated with a structure factor effect is observed.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States)
  2. Australian Centre for Neutron Scattering, NSW (Australia)
Publication Date:
Research Org.:
Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Org.:
U.S. Department of Energy (DoE) under EPSCoR Grant No. DE-SC0012432 ANSTO for access to the QUOKKA SANS instrument through proposal grant P6515 and FRMII for access to the KWSII SANS instrument.
OSTI Identifier:
1605743
Alternate Identifier(s):
OSTI ID: 1677408; OSTI ID: 1773791
Grant/Contract Number:  
SC0012432; SC0019050
Resource Type:
Accepted Manuscript
Journal Name:
Macromolecules
Additional Journal Information:
Journal Volume: 53; Journal Issue: 1; Journal ID: ISSN 0024-9297
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; Star polymers; Scattering Polymer; particles; Chemical structure; Polymers; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Star polymers, Scattering, Polymer particles, Chemical structure, Polymers; SANS, neutron scattering, small-angle neutron scattering, bottlebrush

Citation Formats

Bichler, Karin J., Jakobi, Bruno, Huber, Stefan O., Gilbert, Elliot P., and Schneider, Gerald J. Structural Analysis of Ultrasoft PDMS-g-PDMS Shell-Only Particles. United States: N. p., 2019. Web. https://doi.org/10.1021/acs.macromol.9b01598.
Bichler, Karin J., Jakobi, Bruno, Huber, Stefan O., Gilbert, Elliot P., & Schneider, Gerald J. Structural Analysis of Ultrasoft PDMS-g-PDMS Shell-Only Particles. United States. https://doi.org/10.1021/acs.macromol.9b01598
Bichler, Karin J., Jakobi, Bruno, Huber, Stefan O., Gilbert, Elliot P., and Schneider, Gerald J. Mon . "Structural Analysis of Ultrasoft PDMS-g-PDMS Shell-Only Particles". United States. https://doi.org/10.1021/acs.macromol.9b01598. https://www.osti.gov/servlets/purl/1605743.
@article{osti_1605743,
title = {Structural Analysis of Ultrasoft PDMS-g-PDMS Shell-Only Particles},
author = {Bichler, Karin J. and Jakobi, Bruno and Huber, Stefan O. and Gilbert, Elliot P. and Schneider, Gerald J.},
abstractNote = {We have used anionic polymerization to synthesize polymers of linear and bottlebrush architecture each with a polydimethylsiloxane backbone. The blending of polymer architectures has the effect of changing material properties, e.g., the viscoelasticity, which are connected to the chain conformation. Thus, we explore the conformation of bottlebrush polymers in a linear host melt both as a function of the concentration and for various molecular weights of the linear host matrices. Our bottlebrush polymers are seen as shell-only particles with a negligible core size. We find a substantial influence of the molecular weight of the linear matrices on the structure of the bottlebrushes and their interactions. In samples with a low molecular weight matrix that have the same degree of polymerization as the side chains, the bottlebrush behavior is consistent with an effective theta solvent condition for all concentrations. With increasing molecular weight of the host matrix, this condition is only reached at the highest concentration of the bottlebrush polymers. The increase of the molecular weight of the host matrix leads to a shrinkage of the bottlebrushes and subsequently to a formation of clusters at higher volume fractions. None of the scattering patterns show a pronounced correlation peak; however, decreased forward scattering associated with a structure factor effect is observed.},
doi = {10.1021/acs.macromol.9b01598},
journal = {Macromolecules},
number = 1,
volume = 53,
place = {United States},
year = {2019},
month = {12}
}

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