2:30 PM BB4.5
OXIDATION OF POLYOLEFINS DURING
FLAME SPRAYING. Jeffrey Brogan, Poly Therm Corp, Stony
Brook, NY; Chris Berndt, SUNY Stony Brook, Dept of Materials Science
and Engineering, Stony Brook, NY; George Simon, Monash University,
Department of Materials Engineering, Clayton, Victoria, AUSTRALIA;
Dave Hewitt, Monash University, Department of Chemistry, Clayton,
Victoria, AUSTRALIA.
Thermal spraying of polymers
represents an alternative method to process polymer powder to produce
both polymeric coatings and free-standing forms of great complexity.
Such alternative methods of applying barrier coatings are an
environmentally attractive alternative to solvent-based paints due to
their lack of hazardous chemicals. Despite the extensive utility of
ethylene methacrylic acid copolymers in the field and in laboratory
studies, most work has focussed on the mechanical and adhesion
properties. Much less work has been reported on the effect of rapid
exposure of these organic molecules to a high temperature flame. In
this study, ethylene methacrylic acid copolymer (EMAA) was
flame-sprayed at different conditions and a range of physical and
chemical properties were assessed. Fourier transform infrared
spectroscopy (FTIR) was used to examine the chemistry of the starting
powder with respect to the sprayed coatings. Differential scanning
calorimetry (DSC) was used to determine crystallinity. Coatings were
scanned using dielectric relaxation spectroscopy (DRS) with a
frequency range from 100 Hz to 1 GHz over a temperature interval of
-20 to 85 C. The relaxation associated with the glass-transition
temperature was dependent upon the temperature of the deposited
coating. The effects of thermal oxidation to EMAA copolymer in re
lation to the measured properties will be discussed.
SESSION BB5: SCIENCE AND TECHNOLOGY OF WATER STABILIZED
PLASMAS
Chairs: Joachim V.R. Heberlein and Jan Ilavsky
Wednesday Afternoon, December 3, 1997
Essex North/Center (W)
