A.M.Mohammed; H.KH.Ali; T.A.mondeel
Abstract
Due to the important applications of the unsaturated polyester undernormal climate conditions, this study dealt with polymer blends of this polymerwith polyvinyl acetate (PVAc), using ...
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Due to the important applications of the unsaturated polyester undernormal climate conditions, this study dealt with polymer blends of this polymerwith polyvinyl acetate (PVAc), using tetra hydrofuran (THF) as asolventaccording to the following weight to weight ratios (W/W)(11%,12%,13%,14.5%,16%,17%). Films were made from these two polymersand they were expossed to UV light of 365nm as wave length for 200 hours atroom temperature continously. Another set of films were expossed to heat (80C0)for the same period (thermal aging).IR , UV and light microscope techniqueswere used to follow up the thermal and photo degradation of this system.It hasbeen found that the practical results have shown agreement with the proposedtheory which indicate that the PVAc undergoes cross-linking reactions ratherthan chain degradation, also it has been noticed that the effect of UV radiation ismore 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 makesthe system more stable especially against the UV light and the effect of heat ismore significant than that of the radiation because the PVC did not contain thechromophores can be react with light. The photographs that have taken by thephoto microscope showed agreement with that of the UV and the IR spectra . Insuch away that these systems suffered surface oxidative reactions and then crosslinkingrather than chain degradation. Better weathering resistant polyblends of(UPE) were obtained in this study towards heat and UV effects.
