Document Type : Research Paper
Authors
Abstract
Due to the important applications of the unsaturated polyester under
normal climate conditions, this study dealt with polymer blends of this polymer
with polyvinyl acetate (PVAc), using tetra hydrofuran (THF) as asolvent
according to the following weight to weight ratios (W/W)
(11%,12%,13%,14.5%,16%,17%). Films were made from these two polymers
and they were expossed to UV light of 365nm as wave length for 200 hours at
room temperature continously. Another set of films were expossed to heat (80C0)
for the same period (thermal aging).IR , UV and light microscope techniques
were used to follow up the thermal and photo degradation of this system.It has
been found that the practical results have shown agreement with the proposed
theory which indicate that the PVAc undergoes cross-linking reactions rather
than chain degradation, also it has been noticed that the effect of UV radiation is
more effective in comparison with that of the heat.
By using the same method mentioned above a study on (UPE+PVC)
was carried out under the same conditions. It has been noticed that PVC makes
the system more stable especially against the UV light and the effect of heat is
more significant than that of the radiation because the PVC did not contain the
chromophores can be react with light. The photographs that have taken by the
photo microscope showed agreement with that of the UV and the IR spectra . In
such away that these systems suffered surface oxidative reactions and then crosslinking
rather than chain degradation. Better weathering resistant polyblends of
(UPE) were obtained in this study towards heat and UV effects.
Keywords
Main Subjects
)
