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EFFECTS OF PH/ TEMPERATURE ON THE SWELLING BEHAVIOR AND
RHEOLOGICAL PROPERTIES OF HYDROGEL
by
Byungsoo Kim
________________________________________________________________________
A Dissertation Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(CHEMICAL ENGINEERING)
May 2010
Copyright 2010 Byungsoo Kim
Object Description
| Title | Effects of pH/ temperature on the swelling behavior and rheological properties of hydrogel |
| Author | Kim, Byungsoo |
| Author email | kimb@usc.edu; kimbyungsu@hotmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Chemical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2009-10-26 |
| Date submitted | 2010 |
| Restricted until | Restricted until 19 Aug. 2010. |
| Date published | 2010-08-19 |
| Advisor (committee chair) | Chang, Wenji Victor |
| Advisor (committee member) |
Shing, Katherine S. Hogen-Esch, Thieo E. |
| Abstract | In order to prepare the colloidal particle filled rubbery composite composed of connections of each particle bridged by one single polymer chain, particle size must be as small as possible, especially below 40 nm in diameter. First, emulsifier free emulsion polymerization of styrene was achieved, but the size range of final particles was about 210 nm to 700 nm in diameter, and it was much bigger than our desired size. Alternatively, microemulsion polymerization of styrene was carried out, and the diameter of final particle was about 40 nm.; Nano-sized polystyrene (PS) particles prepared by microemulsion polymerization were incorporated in pH sensitive poly (acrylic acid) hydrogel (PAG) with varying cross-linking density to produce two types of PS bead filled PAG – F40PAG by copolymerization, and PAGPS by the addition of PS bead. Comparing with other two types of hydrogels: PAG and PAGPS, F40PAG showed the slowest swelling rate, lowest equilibrium swollen ratio, highest pH sensitivity of equilibrium swollen ratio, highest storage shear modulus and highest yield strength.; When the pH sensitive monomer such as acrylic acid (AAc) or acrylamide glycolic acid (AAmGAc) was introduced into temperature sensitive poly (N-isopropylacrylamide), it was expected that the phase transition temperature of polymer solution would be observed as a function of pH and the concentration of acid comonomer. In addition to the phase transition behavior, rheological properties, especially viscosities, were also tested and compared. |
| Keyword | pH; emulsion polymerization; hydrogel; phase transition; rheology; polystyrene |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m2855 |
| Contributing entity | University of Southern California |
| Rights | Kim, Byungsoo |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | cisadmin@lib.usc.edu |
| Filename | etd-Kim-3489 |
| Archival file | uscthesesreloadpub_Volume29/etd-Kim-3489.pdf |
Description
| Title | Page 1 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | EFFECTS OF PH/ TEMPERATURE ON THE SWELLING BEHAVIOR AND RHEOLOGICAL PROPERTIES OF HYDROGEL by Byungsoo Kim ________________________________________________________________________ A Dissertation Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (CHEMICAL ENGINEERING) May 2010 Copyright 2010 Byungsoo Kim |
