The diffusing behavior of water through alkyd coatings with different pigment volume concentration (PVC) has been studied by EIS and SEM techniques. The corresponding diffusion coefficients were also calculated. The e...The diffusing behavior of water through alkyd coatings with different pigment volume concentration (PVC) has been studied by EIS and SEM techniques. The corresponding diffusion coefficients were also calculated. The experimental results showed that, in 0.5 mol· L- 1 NaCl solution, the diffusion process of water through alkyd coatings with different PVC followed the ideal-Fick′ s law in the initial period.Within the PVC value concerned, the diffusion coefficients initially decreased with the increase of PVC parameter, reaching a minimum value at 60% , which is the CPVC of micaceous iron oxide, and then increased with the PVC increase. When the PVC was less than CPVC, the barrier property produced by the pigment was the main factor that affected the water diffusion behavior. However, the microstructure of the alkyd coatings played an important role when the PVC was greater than CPVC.展开更多
The dynamic wetting of water spreading on TiO 2 and TiO 2 SiO 2 films prepared by sol gel method and subsequently treated by air plasma and UV irradiation was investigated. Water completely spread on TiO 2 surface wit...The dynamic wetting of water spreading on TiO 2 and TiO 2 SiO 2 films prepared by sol gel method and subsequently treated by air plasma and UV irradiation was investigated. Water completely spread on TiO 2 surface within 3 s and its dynamic contact angles can be expressed by a power law θ d= k(t+a) -n with the n value 0.98. Less than 50%(molar fraction) SiO 2 addition can accelerate the dynamic water spreading rate on the TiO 2 SiO 2 films and the optimum molar fraction of SiO 2 amount corresponding to as annealed, air plasma, and UV irradiation treatment process is 15%, 10% and 20%, respectively.展开更多
以二次蒸馏水、甘油、甲酰胺、二碘甲烷和乙二醇为检测液体,采用接触角法测定聚丙烯(PP)、聚乙烯(PE)、聚氯乙烯(PVC)、聚苯乙烯(PS)、聚对苯二甲酸乙二醇酯(PET)、丙烯脂/丁二烯/苯乙烯共聚物(ABS)、聚碳酸酯(PC)等高分子树脂材料的表...以二次蒸馏水、甘油、甲酰胺、二碘甲烷和乙二醇为检测液体,采用接触角法测定聚丙烯(PP)、聚乙烯(PE)、聚氯乙烯(PVC)、聚苯乙烯(PS)、聚对苯二甲酸乙二醇酯(PET)、丙烯脂/丁二烯/苯乙烯共聚物(ABS)、聚碳酸酯(PC)等高分子树脂材料的表面能参数(Lifshitz-van der Waals分量、Lewis酸分量和Lewis碱分量)。研究结果表明:水-甘油-二碘甲烷、水-甲酰胺-二碘甲烷、水-乙二醇-二碘甲烷3种组合方案中的任一组合均能较好地反映聚合物的表面特征;7种高分子树脂可以分为极性和非极性2大类。PP和PE属于非极性树脂,表面能较低,只存在Lifshitz-van der Waals分量;在极性树脂中,PS,ABS,PC和PET表面具有明显的Lewis碱特征;PVC表面呈现一定的两性特征,除具有Lewis碱特征之外,其表面还带有较多的Lewis酸分量。展开更多
文摘The diffusing behavior of water through alkyd coatings with different pigment volume concentration (PVC) has been studied by EIS and SEM techniques. The corresponding diffusion coefficients were also calculated. The experimental results showed that, in 0.5 mol· L- 1 NaCl solution, the diffusion process of water through alkyd coatings with different PVC followed the ideal-Fick′ s law in the initial period.Within the PVC value concerned, the diffusion coefficients initially decreased with the increase of PVC parameter, reaching a minimum value at 60% , which is the CPVC of micaceous iron oxide, and then increased with the PVC increase. When the PVC was less than CPVC, the barrier property produced by the pigment was the main factor that affected the water diffusion behavior. However, the microstructure of the alkyd coatings played an important role when the PVC was greater than CPVC.
文摘The dynamic wetting of water spreading on TiO 2 and TiO 2 SiO 2 films prepared by sol gel method and subsequently treated by air plasma and UV irradiation was investigated. Water completely spread on TiO 2 surface within 3 s and its dynamic contact angles can be expressed by a power law θ d= k(t+a) -n with the n value 0.98. Less than 50%(molar fraction) SiO 2 addition can accelerate the dynamic water spreading rate on the TiO 2 SiO 2 films and the optimum molar fraction of SiO 2 amount corresponding to as annealed, air plasma, and UV irradiation treatment process is 15%, 10% and 20%, respectively.
文摘以二次蒸馏水、甘油、甲酰胺、二碘甲烷和乙二醇为检测液体,采用接触角法测定聚丙烯(PP)、聚乙烯(PE)、聚氯乙烯(PVC)、聚苯乙烯(PS)、聚对苯二甲酸乙二醇酯(PET)、丙烯脂/丁二烯/苯乙烯共聚物(ABS)、聚碳酸酯(PC)等高分子树脂材料的表面能参数(Lifshitz-van der Waals分量、Lewis酸分量和Lewis碱分量)。研究结果表明:水-甘油-二碘甲烷、水-甲酰胺-二碘甲烷、水-乙二醇-二碘甲烷3种组合方案中的任一组合均能较好地反映聚合物的表面特征;7种高分子树脂可以分为极性和非极性2大类。PP和PE属于非极性树脂,表面能较低,只存在Lifshitz-van der Waals分量;在极性树脂中,PS,ABS,PC和PET表面具有明显的Lewis碱特征;PVC表面呈现一定的两性特征,除具有Lewis碱特征之外,其表面还带有较多的Lewis酸分量。