Abstract
The effects of Adopol EVS-9279X on the emulsion and film properties of poly (vinyl acetate) and acrylic resin have been examined. Variation of these effects with time was investigated in this study using 5%-10% w/w sample formulations. The emulsion and film properties were measured at 4 weekly intervals. Results indicate that properties, such as solid content, drying time and water absorption were decreased by Adopol EVS-9279X. Observation within 8 weeks shows that the solid content increased while the drying time and water absorption decreased further. At 10% w/w concentration, solid content of poly (vinyl acetate) decreased from 38.2% to 33.3% in week 0, which increased to 35.0% in week 4 and 35.2% in week 8. That of acrylic resin decreased from 45.8% to 41.8% in week 0 and later increased to 43.7% in week 4 and 43.8% in week 8. Drying time of poly (vinyl acetate) at 8% w/w concentration decreased from 74.0 min to 51.0 min in week 0, which decreased further to 49.5 min in week 4 and 48.5 min in week 8. At 7% w/w concentration, drying time of acrylic resin reduced from 68.0 min to 58.0 min in week 0, which reduced further to 55.5 min in week 4 and 55.3 min in week 8. Water absorption of poly (vinyl acetate) at 5% w/w concentration was decreased from 45.8% to 38.4% in week 0, which further decreased to 32.8% in week 4 and 32.0% in week 8, while that of acrylic resin was decreased from 37.2% to 34.0% in week 0, 29.9% in week 4 and 29.2% in week 8. Surface tension of poly (vinyl acetate) was increased from 2.06 x 10 –3 N/m to 3.502 x 10 –2 N/m at 5% w/w concentration. This decreased to 3.294 x10 -2 N/m in week 4 and 3.163 x 10 –2 N/m in week 8. That of acrylic resin was decreased from 3.988 x 10 –2 N/m to 2.866 x 10 –2 N/m in week 0 and then decreased further to 2.844 x 10 –2 N/m in weeks 4 and 8. Specific gravity and pH were lowered at low concentration for both polymers. Their variations within the period were not significant. Finally, apparent viscosities and flexibility of both polymers were unaltered by Adopol EVS-9279X. KEY WORDS: Adopol EVS-9279X, Poly (vinyl acetate), Acrylic resin, Time. Global Journal of Pure and Applied Sciences Vol.11(1) 2005: 51-55
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