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Water Content of Hydrated Polymer Brushes Measured by an In Situ Combination of a Quartz Crystal Microbalance with Dissipation Monitoring and Spectroscopic Ellipsometry.
MedLine Citation:
PMID:  22121006     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Poly(methacryloyloxy ethyltrimethylammonium chloride) (PMETAC), poly(sulfopropylmethacrylate potassium salt), or poly(N-isopropyl acrylamide) (PNIPAM) brushes are synthesized by means of the atom transfer radical polymerization technique from gold surfaces coated with a monolayer of the initiator ω-mercaptoundecyl bromo isobutyrate. The brush growth is followed in situ and in real time by the combination of quartz crystal microbalance with dissipation technique (QCM-D) and spectroscopic ellipsometry in a single device. The combination of QCM-D and ellipsometry allows for the simultaneous determination of both the acoustic mass, m(acous) , comprising the mass of the polymer and the solvent, and the optical mass, m(opt) , which corresponds to the polymer mass alone. Brush hydration is calculated from the difference between the values obtained for m(acous) and m(opt) for each polymer synthesized. Brush hydration is then used to quantify the percentage of water released in the brush during collapse; a 30-40% release of water for PMETAC and PSPM brushes in 1 M NaCl and 80% for PNIPAM brushes when the temperature is increased to values above the lower critical solution temperature is observed.
Authors:
Jagoba J Iturri Ramos; Sergio E Moya
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-25
Journal Detail:
Title:  Macromolecular rapid communications     Volume:  -     ISSN:  1521-3927     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9888239     Medline TA:  Macromol Rapid Commun     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Affiliation:
CIC biomaGUNE, Biosurfaces Unit, Paseo Miramón 182 C, 20009 San Sebastian, Gipuzkoa, Spain.
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