Type of Document	Master's Thesis
Author	Nazem, Negin
Author's Email Address	nnazem@vt.edu
URN	etd-93097-173344
Title	Preparation of highly reflective films by supercritical infusion of a silver additive into poly(ether ether ketone)
Degree	Master of Science
Department	Chemical Engineering
Advisory Committee	Advisor Name Title Dr. Larry T. Taylor Committee Chair Dr. Eva Marand Committee Member Dr. Richey M. Davis Committee Member
Keywords	Supercritical fluid Supercritical Fluid Infusion Silver Reflectivity Poly(ether ether ketone)
Date of Defense	1997-10-03
Availability	unrestricted
Abstract PREPARATION OF HIGHLY REFLECTIVE FILMS BY SUPERCRITICAL INFUSION OF A SILVER ADDITIVE INTO POLY(ETHER ETHER KETONE) Negin Nazem (ABSTRACT) There has been a great interest in preparing polymeric reflective surfaces in the last few years. The application of supercritical fluid technology in this area is beginning to receive a great deal of attention. Poly ether ether ketone (PEEK) is well known for its excellent thermal, chemical, mechanical and electrical properties. These properties make it ideal for use in aerospace, electrical, fluid handling and coating industries. Supercritical infusion of a silver–containing additive (1,5-cyclooctadiene- 1,1,1,5,5,5-hexafluoroacetylacetonato)silver(I) into a PEEK film was achieved with moderately high density CO2 at various temperatures, pressures, and times. During the infusion process: 1) polymer sample was exposed to both supercritical CO2 and the additive under pressure for a brief time, 2) depressurization of the system caused the CO2 to rapidly diffuse out of the polymer; while the remaining additive in the polymer desorbed at a much slower rate governed by its diffusivity in the CO2-free polymer. Following this process the infused film was heated for a short time period to thermally reduce the infused metal and to form a reflective surface. In this research the effect of different additive concentrations, infusion conditions (e.g. temperature, pressure, time), and curing conditions (e.g. air flow rate, temperature, time) on the nature of the PEEK surface will be presented.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    THNH.PDF 691.90 Kb 00:03:12 00:01:38 00:01:26 00:00:43 00:00:03

If you have questions or technical problems, please Contact DLA.