Softening of PMMA brushes upon collapse/swelling transition. A combined neutron reflectivity and nanomechanical cantilever sensor study

Sebastian Lenz, Adrian Rühm, J. Major, Rüdiger Berger, Jochen S. Gutmann

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In this work, we establish a direct correlation between chain mechanics and structural properties of polymer brushes upon swelling. We present experimental results on poly(methyl methacrylate) (PMMA) brushes prepared via surface initiated atomic transfer radical polymerization. Neutron reflectivity studies gave insight into the brush thickness and volume fraction profiles of the brush, gradually swollen with solvent mixtures. Comparison of our experiments with scaling theory yielded specific polymer - solvent interaction parameters and gave insight into the desorption and adsorption behavior of bad and good solvents, respectively. Insight into the brush's chain mechanics was obtained from surface stress investigations using the nanomechanical cantilever sensor bending technique. It was shown that polymer brush swelling leads to a decrease in surface stress due to chain disentanglements and the related softening of the polymer brush under θ-solvent conditions.

Original languageEnglish
Pages (from-to)360-367
Number of pages8
JournalMacromolecules
Volume44
Issue number2
DOIs
Publication statusPublished - Jan 25 2011

Fingerprint

Polymethyl Methacrylate
Brushes
Polymethyl methacrylates
Swelling
Neutrons
Sensors
Polymers
Mechanics
Free radical polymerization
Structural properties
Volume fraction
Desorption
Adsorption
Experiments

ASJC Scopus subject areas

  • Organic Chemistry
  • Materials Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry

Cite this

Softening of PMMA brushes upon collapse/swelling transition. A combined neutron reflectivity and nanomechanical cantilever sensor study. / Lenz, Sebastian; Rühm, Adrian; Major, J.; Berger, Rüdiger; Gutmann, Jochen S.

In: Macromolecules, Vol. 44, No. 2, 25.01.2011, p. 360-367.

Research output: Contribution to journalArticle

Lenz, Sebastian ; Rühm, Adrian ; Major, J. ; Berger, Rüdiger ; Gutmann, Jochen S. / Softening of PMMA brushes upon collapse/swelling transition. A combined neutron reflectivity and nanomechanical cantilever sensor study. In: Macromolecules. 2011 ; Vol. 44, No. 2. pp. 360-367.
@article{c2dfe29b32184f9ebe556937ac63c035,
title = "Softening of PMMA brushes upon collapse/swelling transition. A combined neutron reflectivity and nanomechanical cantilever sensor study",
abstract = "In this work, we establish a direct correlation between chain mechanics and structural properties of polymer brushes upon swelling. We present experimental results on poly(methyl methacrylate) (PMMA) brushes prepared via surface initiated atomic transfer radical polymerization. Neutron reflectivity studies gave insight into the brush thickness and volume fraction profiles of the brush, gradually swollen with solvent mixtures. Comparison of our experiments with scaling theory yielded specific polymer - solvent interaction parameters and gave insight into the desorption and adsorption behavior of bad and good solvents, respectively. Insight into the brush's chain mechanics was obtained from surface stress investigations using the nanomechanical cantilever sensor bending technique. It was shown that polymer brush swelling leads to a decrease in surface stress due to chain disentanglements and the related softening of the polymer brush under θ-solvent conditions.",
author = "Sebastian Lenz and Adrian R{\"u}hm and J. Major and R{\"u}diger Berger and Gutmann, {Jochen S.}",
year = "2011",
month = "1",
day = "25",
doi = "10.1021/ma1021715",
language = "English",
volume = "44",
pages = "360--367",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "2",

}

TY - JOUR

T1 - Softening of PMMA brushes upon collapse/swelling transition. A combined neutron reflectivity and nanomechanical cantilever sensor study

AU - Lenz, Sebastian

AU - Rühm, Adrian

AU - Major, J.

AU - Berger, Rüdiger

AU - Gutmann, Jochen S.

PY - 2011/1/25

Y1 - 2011/1/25

N2 - In this work, we establish a direct correlation between chain mechanics and structural properties of polymer brushes upon swelling. We present experimental results on poly(methyl methacrylate) (PMMA) brushes prepared via surface initiated atomic transfer radical polymerization. Neutron reflectivity studies gave insight into the brush thickness and volume fraction profiles of the brush, gradually swollen with solvent mixtures. Comparison of our experiments with scaling theory yielded specific polymer - solvent interaction parameters and gave insight into the desorption and adsorption behavior of bad and good solvents, respectively. Insight into the brush's chain mechanics was obtained from surface stress investigations using the nanomechanical cantilever sensor bending technique. It was shown that polymer brush swelling leads to a decrease in surface stress due to chain disentanglements and the related softening of the polymer brush under θ-solvent conditions.

AB - In this work, we establish a direct correlation between chain mechanics and structural properties of polymer brushes upon swelling. We present experimental results on poly(methyl methacrylate) (PMMA) brushes prepared via surface initiated atomic transfer radical polymerization. Neutron reflectivity studies gave insight into the brush thickness and volume fraction profiles of the brush, gradually swollen with solvent mixtures. Comparison of our experiments with scaling theory yielded specific polymer - solvent interaction parameters and gave insight into the desorption and adsorption behavior of bad and good solvents, respectively. Insight into the brush's chain mechanics was obtained from surface stress investigations using the nanomechanical cantilever sensor bending technique. It was shown that polymer brush swelling leads to a decrease in surface stress due to chain disentanglements and the related softening of the polymer brush under θ-solvent conditions.

UR - http://www.scopus.com/inward/record.url?scp=78751514664&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78751514664&partnerID=8YFLogxK

U2 - 10.1021/ma1021715

DO - 10.1021/ma1021715

M3 - Article

AN - SCOPUS:78751514664

VL - 44

SP - 360

EP - 367

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 2

ER -