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In situ monitoring of the effect of ionic strength and pH on plasma polymer thin films
Author(s) -
Knobloch Jacqueline J.,
Askew Hannah J.,
Jarvis Karyn L.,
Jones Robert,
Shapter Joseph G.,
McArthur Sally L.,
Köper Ingo
Publication year - 2017
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201700084
Subject(s) - quartz crystal microbalance , ionic strength , materials science , x ray photoelectron spectroscopy , allylamine , dielectric spectroscopy , chemical engineering , acrylic acid , polymer , electrochemistry , ionic bonding , polymerization , monomer , analytical chemistry (journal) , ion , polyelectrolyte , electrode , chemistry , composite material , aqueous solution , organic chemistry , adsorption , engineering
The effect of ionic strength and pH on the structure of hydrated plasma polymerized films of allylamine (ppAAm) and acrylic acid (ppAAc) has been analyzed in situ using quartz crystal microbalance with dissipation techniques, electrochemical impedance spectroscopy, ellipsomtery, and X‐ray photoelectron spectroscopy. Both materials showed a salt concentration and pH dependent uptake and release of water and ions. Depending on the type of monomer used, the effects showed reversible or non‐reversible behavior. The investigation of the electrochemical properties of the film further revealed a non‐homogeneous structure, especially in the case of ppAAc films, with regions of higher and lower cross‐linking density. The use of complimentary techniques to characterize the films in situ allowed for a deeper understanding of processes happening inside the plasma polymerized films, which can help to optimize film preparation conditions for selected applications.