Zheng Sun

Abstract

Teflon materials including poly(tetrafluoroethylene) (PTFE) and poly (tetrafluoroethylene-co-hexafluoropropylene) (FEP) were exposed to vacuum UV (VUV) radiation from a He DC arc plasma that was made to rotate inside of a graphite tube by the application of an auxiliary magnetic field. The polymer films were covered with optical filters having different cut-off wavelengths to vary the spectrum of the VUV radiation that modified the fluoropolymer surface. The properties of the surface changed after surface modification as follows: (1) water contact angles started to decrease in the wavelength region between 173 and 160 nm and continued to decrease with shorter wavelengths; (2) surface roughening; (3) defluorination of the surface with a slight increase in the atomic %C and formation of C-C bonds in the top 3-5 nm of the surface as detected by XPS analysis; and (4) incorporation of oxygen upon exposure to air. Changes in the adhesion of copper to these modified surfaces were observed.

Library of Congress Subject Headings

Polytef--Surfaces--Testing; Surface chemistry; Adhesion; Copper; Far ultraviolet radiation; Helium plasmas

Publication Date

2005

Document Type

Thesis

Student Type

Graduate

Degree Name

Chemistry (MS)

Department, Program, or Center

School of Chemistry and Materials Science (COS)

Advisor

Gerald Takacs

Comments

Physical copy available from RIT's Wallace Library at QD383.F48 S86 2005

Campus

RIT – Main Campus

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