Interactions between surfaces bearing highly extended polymer melt brushes: 1. Adhesion and spontaneous thinning

Larisa Tsarkova; Xueyan Zhang; Jacob Klein; Nikos Hadjichristidis

doi:10.1021/ma010981f

Interactions between surfaces bearing highly extended polymer melt brushes: 1. Adhesion and spontaneous thinning

Larisa Tsarkova, Xueyan Zhang, Jacob Klein^*, Nikos Hadjichristidis

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

A surface force balance (SFB) was used to characterize the behavior of highly stretched polymer brush melts. Langmuir-Blodgett monolayers of polyisoprene (M_w = 29.9 kg/mol) end-functionalized with a zwitterionic group were deposited onto freshly cleaved mica (areal density ≈ 1 chain/(170 Å²)), and two identical brush monolayers were brought into adhesive contact in the SFB. The changes in film thickness as well as the topography of the contact could be continuously monitored. We observed spontaneous film thinning of the brush-melt bilayer, attributed to the outward lateral motion of the anchoring end groups resulting from the contact-induced pressure on the confined brushes, and a detailed model for this is presented. Refractive index measurements of the confined PI-X melt brushes did not reveal any significant deviation from the bulk value for polyisoprenes, suggesting that possible effects (if any) on the optical properties due to chain orientation were below our detection limit. The behavior of the two opposing brush melts was compared with that where only one brush monolayer was confined between mica surfaces.

Original language	English (US)
Pages (from-to)	2817-2826
Number of pages	10
Journal	Macromolecules
Volume	35
Issue number	7
DOIs	https://doi.org/10.1021/ma010981f
State	Published - Mar 26 2002
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma010981f

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title = "Interactions between surfaces bearing highly extended polymer melt brushes: 1. Adhesion and spontaneous thinning",

abstract = "A surface force balance (SFB) was used to characterize the behavior of highly stretched polymer brush melts. Langmuir-Blodgett monolayers of polyisoprene (Mw = 29.9 kg/mol) end-functionalized with a zwitterionic group were deposited onto freshly cleaved mica (areal density ≈ 1 chain/(170 {\AA}2)), and two identical brush monolayers were brought into adhesive contact in the SFB. The changes in film thickness as well as the topography of the contact could be continuously monitored. We observed spontaneous film thinning of the brush-melt bilayer, attributed to the outward lateral motion of the anchoring end groups resulting from the contact-induced pressure on the confined brushes, and a detailed model for this is presented. Refractive index measurements of the confined PI-X melt brushes did not reveal any significant deviation from the bulk value for polyisoprenes, suggesting that possible effects (if any) on the optical properties due to chain orientation were below our detection limit. The behavior of the two opposing brush melts was compared with that where only one brush monolayer was confined between mica surfaces.",

author = "Larisa Tsarkova and Xueyan Zhang and Jacob Klein and Nikos Hadjichristidis",

year = "2002",

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doi = "10.1021/ma010981f",

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T1 - Interactions between surfaces bearing highly extended polymer melt brushes

T2 - 1. Adhesion and spontaneous thinning

AU - Tsarkova, Larisa

AU - Zhang, Xueyan

AU - Klein, Jacob

AU - Hadjichristidis, Nikos

PY - 2002/3/26

Y1 - 2002/3/26

N2 - A surface force balance (SFB) was used to characterize the behavior of highly stretched polymer brush melts. Langmuir-Blodgett monolayers of polyisoprene (Mw = 29.9 kg/mol) end-functionalized with a zwitterionic group were deposited onto freshly cleaved mica (areal density ≈ 1 chain/(170 Å2)), and two identical brush monolayers were brought into adhesive contact in the SFB. The changes in film thickness as well as the topography of the contact could be continuously monitored. We observed spontaneous film thinning of the brush-melt bilayer, attributed to the outward lateral motion of the anchoring end groups resulting from the contact-induced pressure on the confined brushes, and a detailed model for this is presented. Refractive index measurements of the confined PI-X melt brushes did not reveal any significant deviation from the bulk value for polyisoprenes, suggesting that possible effects (if any) on the optical properties due to chain orientation were below our detection limit. The behavior of the two opposing brush melts was compared with that where only one brush monolayer was confined between mica surfaces.

AB - A surface force balance (SFB) was used to characterize the behavior of highly stretched polymer brush melts. Langmuir-Blodgett monolayers of polyisoprene (Mw = 29.9 kg/mol) end-functionalized with a zwitterionic group were deposited onto freshly cleaved mica (areal density ≈ 1 chain/(170 Å2)), and two identical brush monolayers were brought into adhesive contact in the SFB. The changes in film thickness as well as the topography of the contact could be continuously monitored. We observed spontaneous film thinning of the brush-melt bilayer, attributed to the outward lateral motion of the anchoring end groups resulting from the contact-induced pressure on the confined brushes, and a detailed model for this is presented. Refractive index measurements of the confined PI-X melt brushes did not reveal any significant deviation from the bulk value for polyisoprenes, suggesting that possible effects (if any) on the optical properties due to chain orientation were below our detection limit. The behavior of the two opposing brush melts was compared with that where only one brush monolayer was confined between mica surfaces.

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M3 - Article

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JO - Macromolecules

JF - Macromolecules

IS - 7

ER -

Interactions between surfaces bearing highly extended polymer melt brushes: 1. Adhesion and spontaneous thinning

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