Chemical vapor deposition of functionalized isobenzofuran polymers
Name
156793374-MIT.pdf
Description
Full printable version
Size
2.27 MB
Format
Adobe PDF
Checksum (MD5)
d07d2d016cf78ec92afebb10b9c73705
Author(s)
Olsson, Ylva Kristina
Advisor(s)
Klavs F. Jensen.
Date Issued
2007
Publisher
Massachusetts Institute of Technology
Abstract
This thesis develops a platform for deposition of polymer thin films that can be further tailored by chemical surface modification. First, we explore chemical vapor deposition of functionalized isobenzofuran films using two different functional groups: pentafluorophenolate ester and alkyne. Both functional groups can be further modified using either ester substitution or click chemistry, respectively. The resulting thin films are characterized extensively using nuclear magnetic resonance (NMR), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). We show that the functional groups remain on the surface post deposition for both films at cracking temperature not exceeding 6000C. However, gel permeation chromatography(GPC) measurements of the pentafluorophenolate ester films show only marginal polymerization. On the other hand, the alkyne films appear crosslinked and showed defect formation. Films deposited at ambient temperature show formation of a large number of micro defects. Increasing the deposition temperature, in addition to increasing the growth rate, also leads to formation of films with two distinct domains: one smooth domain with no micro defects and another filled with defects.
(cont.) Analogous to the deposition of unmodified isobenzofuran films, the films with alkyne moiety have a high refractive index and are transparent in the visible and near IR range. Second, we explore coating of poly(dimethyl siloxane) (PDMS) microfluidic devices with poly(glycidyl methacrylate) (PGMA) thin films using initiated hot filament chemical vapor deposition. We demonstrate a use of a new ultra violet (UV) initiated bonding method that allows PGMA coated PDMS devices to be sealed to PGMA coated glass, while maintaining the integrity of the majority of surface functional groups. This approach allowed us to further functionalize the channel walls with hexamethylene diamine (HMDA) and poly(ethylene glycol) (PEG)-bis(amine) to make a lasting hydrophilic surface. Bonding of devices proved to be stable up to 2 bar.
Description
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2007.
Includes bibliographical references (leaves 47-48).
Subjects
Materials Science and Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
Persistent DSpace Link
