Different Response Kinetics to Temperature and Water Vapor of Acrylamide Polymers Obtained by Initiated Chemical Vapor Deposition

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

Thermoresponsive polymers undergo a reversible phase transition at their lower critical solution temperature (LCST) from a hydrated hydrophilic state at temperatures below the LCST to a collapsed hydrophobic state at higher temperatures. This results in a strong response to temperature when in aqueous environment. This study shows that hydrogel thin films synthesized by initiated chemical vapor deposition show fast and strong response to temperature also in water vapor environment. Thin films of cross-linked poly(N-isopropylacrylamide), p(NIPAAm), were found to have a sharp change in thickness by 200% in water vapor at temperatures above and below the LCST. Additionally, the stimuli-responsive poly(N,N-diethylacrylamide) was investigated and compared to results found for p(NIPAAm). Analysis of the swelling kinetics performed with in situ spectroscopic ellipsometry with variable stage temperature shows differences for swelling and deswelling processes, and a hysteresis in the thickness profile was found as a function of temperature and of temperature change rate.

Spracheenglisch
Seiten6636-6645
Seitenumfang10
FachzeitschriftACS Applied Materials & Interfaces
Jahrgang10
Ausgabennummer7
DOIs
StatusVeröffentlicht - 21 Feb 2018

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Acrylamide
Steam
Water vapor
Chemical vapor deposition
Polymers
Kinetics
Temperature
Swelling
Thin films
Spectroscopic ellipsometry
Hydrogel
Hydrogels
Hysteresis
Phase transitions

Schlagwörter

    ASJC Scopus subject areas

    • !!Materials Science(all)

    Fields of Expertise

    • Advanced Materials Science

    Dies zitieren

    Different Response Kinetics to Temperature and Water Vapor of Acrylamide Polymers Obtained by Initiated Chemical Vapor Deposition. / Salzmann, Paul; Perrotta, Alberto; Coclite, Anna Maria.

    in: ACS Applied Materials & Interfaces, Jahrgang 10, Nr. 7, 21.02.2018, S. 6636-6645.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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    AU - Coclite, Anna Maria

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