Abstract/Details

Polymer brush-modified photopolymer network surfaces and their applications


2010 2010

Other formats: Order a copy

Abstract (summary)

Because of their important role in many areas of science and technology, polymer brushes have been extensively studied theoretically and experimentally. In the first part of my thesis, in order to understand the molecular weight behavior of polymer brushes, a new method to cleave polymer brushes were investigated. A new inimer (having both an initiator and monomer fragment) was synthesized. After growing polymer brushes from these inimers containing cleavable linkages, the polymer brush layers were characterized by various techniques. The brush chains were cleaved and collected, providing an opportunity to study and compare polymer grown in solution vs. polymer grafted from the inimer-inbedded surfaces. Molecular weight differences were determined since it has been assumed, but not confirmed, that polymers synthesized in both manners should have the same molecular weight.

Since growing a brush layer from a photopolymer (PP) layer is different than growing brushes from the surface directly, the first part of my thesis is dedicated to showing the differences between these two surfaces and how the PP network affects the brush growth with using different characterization methods such as neutron reflectivity and secondary ion mass spectroscopy. These studies helped to understand the characteristic behavior of the polymer brushes such as where the initiation occurs, how the inimer concentration affects on the photopolymer properties.

The next part of my thesis is about the possible applications of polymer brushes. We examined the antibacterial effects of –onium salts and enzymes attached to polymer brushes. It is already known that -onium salts can be used as antibacterial agents in solution. They can kill both Gram-positive and Gram-negative bacteria. In our case, polymer brushes were grown from the PP layer spin-coated on glass substrates, and we investigated their antibacterial effectiveness of these polymer brushes. Phosphonium salts and lysozyme were used as antibacterial agents. Lysozyme was chosen since it is biocompatible and can be used inside the body.

Lastly, azobenzene-containing photoresposive polymer brushes were prepared and the surface properties before and after UV exposure were observed. The surface wettability changes dramatically, and using only UV light is one of the safest and cleanest way to alter surface properties.

Indexing (details)


Subject
Polymer chemistry
Classification
0495: Polymer chemistry
Identifier / keyword
Pure sciences; Antibacterial; Photopolymer network; Photoresponsive; Polymer brush
Title
Polymer brush-modified photopolymer network surfaces and their applications
Author
Koylu, Damla
Number of pages
161
Publication year
2010
Degree date
2010
School code
0118
Source
DAI-B 71/07, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781124072791
Advisor
Carter, Kenneth R.
Committee member
Crosby, Alfred J.; Venkataraman, Dhandapani
University/institution
University of Massachusetts Amherst
Department
Polymer Science & Engineering
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3409612
ProQuest document ID
648051258
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/648051258
Access the complete full text

You can get the full text of this document if it is part of your institution's ProQuest subscription.

Try one of the following:

  • Connect to ProQuest through your library network and search for the document from there.
  • Request the document from your library.
  • Go to the ProQuest login page and enter a ProQuest or My Research username / password.