Controlling Internal Organization of Multilayer Poly(methacrylic acid) Hydrogels with Polymer Molecular Weight

Kozlovskaya, Veronika; Zavgorodnya, Oleksandra; Ankner, John F.; Kharlampieva, Eugenia

doi:10.1021/acs.macromol.5b02019

Title: Controlling Internal Organization of Multilayer Poly(methacrylic acid) Hydrogels with Polymer Molecular Weight

Journal Article · Mon Nov 16 00:00:00 EST 2015 · Macromolecules

DOI:https://doi.org/10.1021/acs.macromol.5b02019· OSTI ID:1324154

Kozlovskaya, Veronika ^[1]; Zavgorodnya, Oleksandra ^[1]; Ankner, John F. ^[2]; Kharlampieva, Eugenia ^[3]

Univ. of Alabama, Birmingham, AL (United States). Dept. of Chemistry
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source
Univ. of Alabama, Birmingham, AL (United States). Dept. of Chemistry and Center for Nanoscale Materials and Biointegration

Here, we report on tailoring the internal architecture of multilayer-derived poly(methacrylic acid) (PMAA) hydrogels by controlling the molecular weight of poly(N-vinylpyrrolidone) (PVPON) in hydrogen-bonded (PMAA/PVPON) layer-by-layer precursor films. The hydrogels are produced by cross-linking PMAA in the spin-assisted multilayers followed by PVPON release. We found that the thickness, morphology, and architecture of hydrogen-bonded films and the corresponding hydrogels are significantly affected by PVPON chain length. For all systems, an increase in PVPON molecular weight from M_w = 2.5 to 1300 kDa resulted in increased total film thickness. We also show that increasing polymer M_w smooths the hydrogen-bonded film surfaces but roughens those of the hydrogels. Using deuterated dPMAA marker layers in neutron reflectometry measurements, we found that hydrogen-bonded films reveal a high degree of stratification which is preserved in the cross-linked films. We observed dPMAA to be distributed more widely in the hydrogen-bonded films prepared with small M_w PVPON due to the greater mobility of short-chain PVPON. Furthermore, these variations in the distribution of PMAA are erased after cross-linking, resulting in a distribution of dPMAA over about two bilayers for all M_w but being somewhat more widely distributed in the films templated with higher M_w PVPON. Finally, our results yield new insights into controlling the organization of nanostructured polymer networks using polymer molecular weight and open opportunities for fabrication of thin films with well-organized architecture and controllable function.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1324154

Journal Information:: Macromolecules, Vol. 48, Issue 23; ISSN 0024-9297

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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