Surface modification of polypropylene and polypropylene blends using ultraviolet/ozone was studied. In this study, the effect of the conditions of UV irradiation for PP structure was investigated by 13C-NMR, GPC, DSC analysis. It was shown UV irradiation under air resulted in more decreasing molecul...
Surface modification of polypropylene and polypropylene blends using ultraviolet/ozone was studied. In this study, the effect of the conditions of UV irradiation for PP structure was investigated by 13C-NMR, GPC, DSC analysis. It was shown UV irradiation under air resulted in more decreasing molecular weight by chain scission than the case of nitrogen. For degradation of PP by UV, it could be concluded chain scission mainly showed under air and cross-linking happened with chain scission at the same time under nitrogen.
On the other side, the effect of UVO treat. time, ozone flow rate and various aging conditions on UVO treatment for PP, PP/LLDPE blend, PP/EPM blend was studied. It was founded that oxygen functional groups increased with UVO treat. time and ozone flow rate. Polar surface energy increased with treatment time and ozone flow rate and tended to level off at certain point. It was attributed to the saturation of surface energy by polar groups. Besides adhesion strength increased with UVO treatment time and ozone flow rate for PP. But at certain point, adhesion strength decreased with UVO treatment time and ozone flow rate for PP/LLDPE blend and PP/EPM blend. It was attributed low molecular weight materials like oxygen functional groups. However it was identified that UVO could be an effective method to modify the surface of PP, PP/LLDPE blend, PP/EPM blend. Also, there were different results for aging behaviors of PP, PP/LLDPE blend, PP/EPM blend by contact angle measurement, ESCA, FTIR-ATR analysis. It could b e suggested that the aging behaviors of UVO treated PP, PP/LLDPE blend and PP/EPM blend were deeply related to the surface energy of aging conditions. For PP, oxygen functional groups migrated into the bulk under air which has low surface energy, they migrated to the surface under water which has high surface energy. For PP/LLDPE blend, PP/EPM blend, low molecular weight materials like oxygen functional groups migrated with oxygen functional groups into the bulk under air and they migrated to the surface under water. In addition, these low molecular weight materials could result in poor adhesion.
Surface modification of polypropylene and polypropylene blends using ultraviolet/ozone was studied. In this study, the effect of the conditions of UV irradiation for PP structure was investigated by 13C-NMR, GPC, DSC analysis. It was shown UV irradiation under air resulted in more decreasing molecular weight by chain scission than the case of nitrogen. For degradation of PP by UV, it could be concluded chain scission mainly showed under air and cross-linking happened with chain scission at the same time under nitrogen.
On the other side, the effect of UVO treat. time, ozone flow rate and various aging conditions on UVO treatment for PP, PP/LLDPE blend, PP/EPM blend was studied. It was founded that oxygen functional groups increased with UVO treat. time and ozone flow rate. Polar surface energy increased with treatment time and ozone flow rate and tended to level off at certain point. It was attributed to the saturation of surface energy by polar groups. Besides adhesion strength increased with UVO treatment time and ozone flow rate for PP. But at certain point, adhesion strength decreased with UVO treatment time and ozone flow rate for PP/LLDPE blend and PP/EPM blend. It was attributed low molecular weight materials like oxygen functional groups. However it was identified that UVO could be an effective method to modify the surface of PP, PP/LLDPE blend, PP/EPM blend. Also, there were different results for aging behaviors of PP, PP/LLDPE blend, PP/EPM blend by contact angle measurement, ESCA, FTIR-ATR analysis. It could b e suggested that the aging behaviors of UVO treated PP, PP/LLDPE blend and PP/EPM blend were deeply related to the surface energy of aging conditions. For PP, oxygen functional groups migrated into the bulk under air which has low surface energy, they migrated to the surface under water which has high surface energy. For PP/LLDPE blend, PP/EPM blend, low molecular weight materials like oxygen functional groups migrated with oxygen functional groups into the bulk under air and they migrated to the surface under water. In addition, these low molecular weight materials could result in poor adhesion.
주제어
#UV/Ozone
#폴리프로필렌
#폴리프로필렌 블렌드
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