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The Waterborne Symposium

Environmentally Friendly Coating Technologies

Mission Statement:

To administer the preeminent educational/technical forum in the United States directed to the science and technology of surface coatings and  to provide revenue to support and advance the School of Polymers and High Performance Materials at The University of Southern Mississippi.

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April L. Fogel - Synthesis of copolymer hydrogel networks for the determination of the effects of network architecture on water structure and hydration processes

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April L. Fogel - Synthesis of copolymer hydrogel networks for the determination of the effects of network architecture on water structure and hydration processes

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April L. Fogel
Graduate Student
University of Southern Mississippi
Co-Authors: Bishal Upadhyay Jay Mills, Sarah E. Morgan
 

ABSTRACT

Hydrogels are capable of absorbing many times their weight in water but are insoluble in water due to their crosslinked nature, making them ideal materials for use in biomedical applications such as drug delivery systems. Water within hydrogel networks plays a pivotal role in dictating network properties such as mechanical stability, permeability, and network architecture. Three structural states of water (bound, restricted, and free) exist within hydrogel networks, which are described by the degree of hydrogen bonding that occurs between molecular water and the network. The purpose of this study is to gain a fundamental understanding of the influence of structural parameters such as crosslink density, hydrophilic to hydrophobic content, and hydrophilic monomer identity on water content, structure and hydration processes (e.g. hydration and dehydration) of copolymer hydrogels. Acrylamide based glycomonomers containing a stereospecific pendant galactose moiety (GalEAm) and dimethyl acrylamide (DMA) were independently used as the hydrophilic component in hydrogels synthesized via UV initiated free radical polymerization. A siloxane containing monomer, 3-acrylamidopropyltris (trimethylsiloxy)silane (ATris) was incorporated to tailor the level of hydration as well as the distribution of bound water in varying network architectures. Water structure and hydration processes of varying network architectures were characterized via thermogravimetric analysis (TGA) and dynamic scanning calorimetry (DSC). Significant differences in equilibrium water and bound water content are observed as a function of hydrophobic content and crosslink density.

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