Moisture absorption into ultrathin hydrophilic polymer films on different substrate surfaces

Bryan D. Vogt; Christopher L. Soles; Hae Jeong Lee; Eric K. Lin; Wen Li Wu

doi:10.1016/j.polymer.2004.11.114

Moisture absorption into ultrathin hydrophilic polymer films on different substrate surfaces

Bryan D. Vogt, Christopher L. Soles, Hae Jeong Lee, Eric K. Lin, Wen Li Wu

Chemical Engineering

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

104 Scopus citations

Abstract

Moisture absorption into ultrathin poly(vinyl pyrrolidone) (PVP) films with varying thickness was examined using X-ray reflectivity (XR) and quartz crystal microbalance (QCM) measurements. Two different surfaces were used for the substrate: a hydrophilic silicon oxide (SiO_x) and a hydrophobic hexamethyldisilazane (HMDS) treated silicon oxide surface. The total equilibrium moisture absorption (solubility) was insensitive to the surface treatment in the thickest films (≈150 nm). However, strong reductions in the equilibrium uptake with decreasing PVP film thickness were observed on the HMDS surfaces, while the SiO_x surface exhibited thickness independent equilibrium absorption. The decreased absorption with decreasing film thickness is attributed a depletion layer of water near the polymer/HMDS interface, arising from hydrophobic interactions between the surface and water. The diffusivity of water decreased when the film thickness was less than 60 nm, independent of the surface treatment. Changes in the properties of ultrathin polymer films occur even in plasticized films containing nearly 50% water.

Original language	English (US)
Pages (from-to)	1635-1642
Number of pages	8
Journal	Polymer
Volume	46
Issue number	5
DOIs	https://doi.org/10.1016/j.polymer.2004.11.114
State	Published - Feb 14 2005

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/j.polymer.2004.11.114

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@article{d7709807267347b59eb91c2a5c5d2d35,

title = "Moisture absorption into ultrathin hydrophilic polymer films on different substrate surfaces",

abstract = "Moisture absorption into ultrathin poly(vinyl pyrrolidone) (PVP) films with varying thickness was examined using X-ray reflectivity (XR) and quartz crystal microbalance (QCM) measurements. Two different surfaces were used for the substrate: a hydrophilic silicon oxide (SiOx) and a hydrophobic hexamethyldisilazane (HMDS) treated silicon oxide surface. The total equilibrium moisture absorption (solubility) was insensitive to the surface treatment in the thickest films (≈150 nm). However, strong reductions in the equilibrium uptake with decreasing PVP film thickness were observed on the HMDS surfaces, while the SiOx surface exhibited thickness independent equilibrium absorption. The decreased absorption with decreasing film thickness is attributed a depletion layer of water near the polymer/HMDS interface, arising from hydrophobic interactions between the surface and water. The diffusivity of water decreased when the film thickness was less than 60 nm, independent of the surface treatment. Changes in the properties of ultrathin polymer films occur even in plasticized films containing nearly 50% water.",

author = "Vogt, {Bryan D.} and Soles, {Christopher L.} and Lee, {Hae Jeong} and Lin, {Eric K.} and Wu, {Wen Li}",

note = "Funding Information: BDV acknowledges financial support from the NIST/NRC postdoctoral fellowship program. The authors thank B.J. Bauer for graciously providing the poly(vinyl pyrrolidone). Copyright: Copyright 2018 Elsevier B.V., All rights reserved.",

year = "2005",

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doi = "10.1016/j.polymer.2004.11.114",

language = "English (US)",

volume = "46",

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T1 - Moisture absorption into ultrathin hydrophilic polymer films on different substrate surfaces

AU - Vogt, Bryan D.

AU - Soles, Christopher L.

AU - Lee, Hae Jeong

AU - Lin, Eric K.

AU - Wu, Wen Li

N1 - Funding Information: BDV acknowledges financial support from the NIST/NRC postdoctoral fellowship program. The authors thank B.J. Bauer for graciously providing the poly(vinyl pyrrolidone). Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

PY - 2005/2/14

Y1 - 2005/2/14

N2 - Moisture absorption into ultrathin poly(vinyl pyrrolidone) (PVP) films with varying thickness was examined using X-ray reflectivity (XR) and quartz crystal microbalance (QCM) measurements. Two different surfaces were used for the substrate: a hydrophilic silicon oxide (SiOx) and a hydrophobic hexamethyldisilazane (HMDS) treated silicon oxide surface. The total equilibrium moisture absorption (solubility) was insensitive to the surface treatment in the thickest films (≈150 nm). However, strong reductions in the equilibrium uptake with decreasing PVP film thickness were observed on the HMDS surfaces, while the SiOx surface exhibited thickness independent equilibrium absorption. The decreased absorption with decreasing film thickness is attributed a depletion layer of water near the polymer/HMDS interface, arising from hydrophobic interactions between the surface and water. The diffusivity of water decreased when the film thickness was less than 60 nm, independent of the surface treatment. Changes in the properties of ultrathin polymer films occur even in plasticized films containing nearly 50% water.

AB - Moisture absorption into ultrathin poly(vinyl pyrrolidone) (PVP) films with varying thickness was examined using X-ray reflectivity (XR) and quartz crystal microbalance (QCM) measurements. Two different surfaces were used for the substrate: a hydrophilic silicon oxide (SiOx) and a hydrophobic hexamethyldisilazane (HMDS) treated silicon oxide surface. The total equilibrium moisture absorption (solubility) was insensitive to the surface treatment in the thickest films (≈150 nm). However, strong reductions in the equilibrium uptake with decreasing PVP film thickness were observed on the HMDS surfaces, while the SiOx surface exhibited thickness independent equilibrium absorption. The decreased absorption with decreasing film thickness is attributed a depletion layer of water near the polymer/HMDS interface, arising from hydrophobic interactions between the surface and water. The diffusivity of water decreased when the film thickness was less than 60 nm, independent of the surface treatment. Changes in the properties of ultrathin polymer films occur even in plasticized films containing nearly 50% water.

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DO - 10.1016/j.polymer.2004.11.114

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SP - 1635

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JO - Polymer

JF - Polymer

IS - 5

ER -

Moisture absorption into ultrathin hydrophilic polymer films on different substrate surfaces

Abstract

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