Abstract/Details

Surface chemistry of poly(<i>p</i>-xylylene) and nylon


2005 2005

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Abstract (summary)

The interaction of a material with its surroundings occurs at the material-environment interface, therefore, the chemical and physical characteristics of the material's surface plays a fundamental role in determining its properties, such as its biocompatibility, adhesion, and wettability, and ultimately, its technological applicability. This dissertation discusses aspects of the chemical surface modification of two polymers, poly(p-xylylene) and nylon.

Chapter 2 focuses on the synthesis and wet-chemistry surface modification of poly(p-xylylene) (PPX) thin films. A series of electrophilic aromatic substitutions were studied including chlorosulfonation, chloroamidomethylation, and Friedel-Crafts catalyzed reactions. It was found that the yields and surface selectivity of the reactions studied were highly dependent on the interaction of the polymer with the reaction medium.

Chapter 3 describes the use of vapor deposition polymerization in template-assisted synthesis. Poly(p-xylylene) nanotubes were synthesized by template assisted methods using porous aluminum oxide membranes as the templating material. The pore diameter showed a linear dependence with respect to the deposition time. FESEM analysis showed that PPX was deposited along the pores of the membranes. Exposure of the membranes to a reactive solution resulted in chemical functionalization of the inner walls of the nanotubes, confirmed by XPS.

Chapter 4 discusses the chemical reduction of nylon film surfaces by reaction with a borane-tetrahydrofuran complex. It was observed that, while the reaction occurs in high yields, its surface-confinement is highly dependent on the segmental mobility of the polymer. The amine-rich surfaces were further used as templates for the synthesis of composite films by electrostatic adsorption of polyanions.

Chapter 5 deals with the synthesis of linear polyalkyleneimines of different hydrocarbon lengths by the surface-mediated reduction of nylons. These polyalkyleneimines were further used as compatibilizers for the melt intercalation of montmorillonite clays, modified and unmodified, with polypropylene. The polyamines were found to interact favorably with the clays, leading to intercalated and exfoliated systems. The determining factor in controlling the degree of dispersion of the clays, was the enthalpic interaction between the clay and the compatibilizer.

Indexing (details)


Subject
Materials science;
Polymers
Classification
0794: Materials science
0495: Polymers
Identifier / keyword
Applied sciences; Pure sciences; Nylon; Poly(p-xylylene); Surface chemistry
Title
Surface chemistry of poly(<i>p</i>-xylylene) and nylon
Author
Herrera-Alonso, Margarita
Number of pages
168
Publication year
2005
Degree date
2005
School code
0118
Source
DAI-B 66/02, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780496976607, 0496976605
Advisor
McCarthy, Thomas J.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3163673
ProQuest document ID
305000063
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305000063
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