Interfacial Properties of Environmentally Responsive Polymers
Zhu, Xi
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https://hdl.handle.net/2142/82378
Description
Title
Interfacial Properties of Environmentally Responsive Polymers
Author(s)
Zhu, Xi
Issue Date
2005
Doctoral Committee Chair(s)
Deborah Leckband
Department of Study
Chemical Engineering
Discipline
Chemical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Chemistry, Polymer
Language
eng
Abstract
Direct force measurements quantified the substantial pH-dependent change in the molecular properties of end-grafted NIPAM-N-Gly-(C18) 2 monolayers. At pH 8.0, where the glycine side chains are ionized, the polymers exhibit stereotypical polyelectrolyte behavior. Side chain neutralization at pH 5.0 causes a substantial decrease in the film thickness, and the polymer films adhere strongly. The adhesion is presumably through H-bonding between the glycine side chains. Our findings revealed the likely molecular basis of pH-dependent changes in the copolymer films and identified clear design criteria for tuning the interfacial properties of these polymer films. In addition to the study of the interfacial properties of NIPAM-Gly copolymer, we also investigated the mucoadhesive properties using SFA and Surface Plasmon Resonance (SPR), and identify key parameters that control the interaction between hydrogen bonding polymers and soluble mucin.
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