Molecular weight dependence of polymer chain mobility within multilayer films

Li Xu; Victor Selin; Aliaksandr Zhuk; John F. Ankner; Svetlana A. Sukhishvili

doi:10.1021/mz400413v

Molecular weight dependence of polymer chain mobility within multilayer films

Li Xu, Victor Selin, Aliaksandr Zhuk, John F. Ankner, Svetlana A. Sukhishvili

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

92 Scopus citations

Abstract

Fluorescence recovery after photobleaching has been applied to determine, to our knowledge for the first time, the molecular weight (M_w) dependence of lateral diffusion of polymer chains within layer-by-layer (LbL) films. As shown by neutron reflectometry, polyelectrolyte multilayers containing polymethacrylic acid (PMAA, M_w/M_n < 1.05) of various molecular weights assembled from solutions of low ionic strengths at pH 4.5, where film growth was linear, showed similar diffusion of PMAA in the direction perpendicular to the film surface. At a salt concentration sufficient for unfreezing electrostatically bonded chains, layer intermixing remained almost unaffected (changes <1.0 nm), while the lateral diffusion coefficient (D) scaled with the PMAA molecular weight as D ∼ M_w ^-1±0.05.

Original language	English
Pages (from-to)	865-868
Number of pages	4
Journal	ACS Macro Letters
Volume	2
Issue number	10
DOIs	https://doi.org/10.1021/mz400413v
State	Published - Oct 15 2013
Externally published	Yes

Funding

Funders	Funder number
National Science Foundation	0906474

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title = "Molecular weight dependence of polymer chain mobility within multilayer films",

abstract = "Fluorescence recovery after photobleaching has been applied to determine, to our knowledge for the first time, the molecular weight (Mw) dependence of lateral diffusion of polymer chains within layer-by-layer (LbL) films. As shown by neutron reflectometry, polyelectrolyte multilayers containing polymethacrylic acid (PMAA, Mw/Mn < 1.05) of various molecular weights assembled from solutions of low ionic strengths at pH 4.5, where film growth was linear, showed similar diffusion of PMAA in the direction perpendicular to the film surface. At a salt concentration sufficient for unfreezing electrostatically bonded chains, layer intermixing remained almost unaffected (changes <1.0 nm), while the lateral diffusion coefficient (D) scaled with the PMAA molecular weight as D ∼ Mw -1±0.05.",

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T1 - Molecular weight dependence of polymer chain mobility within multilayer films

AU - Xu, Li

AU - Selin, Victor

AU - Zhuk, Aliaksandr

AU - Ankner, John F.

AU - Sukhishvili, Svetlana A.

PY - 2013/10/15

Y1 - 2013/10/15

N2 - Fluorescence recovery after photobleaching has been applied to determine, to our knowledge for the first time, the molecular weight (Mw) dependence of lateral diffusion of polymer chains within layer-by-layer (LbL) films. As shown by neutron reflectometry, polyelectrolyte multilayers containing polymethacrylic acid (PMAA, Mw/Mn < 1.05) of various molecular weights assembled from solutions of low ionic strengths at pH 4.5, where film growth was linear, showed similar diffusion of PMAA in the direction perpendicular to the film surface. At a salt concentration sufficient for unfreezing electrostatically bonded chains, layer intermixing remained almost unaffected (changes <1.0 nm), while the lateral diffusion coefficient (D) scaled with the PMAA molecular weight as D ∼ Mw -1±0.05.

AB - Fluorescence recovery after photobleaching has been applied to determine, to our knowledge for the first time, the molecular weight (Mw) dependence of lateral diffusion of polymer chains within layer-by-layer (LbL) films. As shown by neutron reflectometry, polyelectrolyte multilayers containing polymethacrylic acid (PMAA, Mw/Mn < 1.05) of various molecular weights assembled from solutions of low ionic strengths at pH 4.5, where film growth was linear, showed similar diffusion of PMAA in the direction perpendicular to the film surface. At a salt concentration sufficient for unfreezing electrostatically bonded chains, layer intermixing remained almost unaffected (changes <1.0 nm), while the lateral diffusion coefficient (D) scaled with the PMAA molecular weight as D ∼ Mw -1±0.05.

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Molecular weight dependence of polymer chain mobility within multilayer films

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