树枝状聚合物ppt课件
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树枝状聚合物是有效的脲醛(UF)树脂的粘合促进剂树枝状聚合物表现出高的表面活性,在非常低的浓度-临界聚集浓度(CACs)时,他们有能力在水中自身聚合。
随着PAMAM代数的增加,CACs减小,分子量和结构对控制表面活性和CAC有重要的影响。
树枝状化合物是有效的脲醛(UF)树脂的粘合促进剂,它所起的作用是由于表面大量的基团,可以增大表面润湿性。
树枝状聚合物链末端的活性基团,可以在非常低的浓度,通过自身的作用形成大的聚合。
聚合体的形成,使它们的水溶液的表面张力显著下降。
它们在空气- 水界面形成了他们的表面活性。
在脲醛树脂中加入G3-NH3Cl能大幅提高木材粘合剂的粘合性。
威海晨源化工新材料有限公司整理自《Different End Groups, as Adhesion Promoters for Urea-Formaldehyde Wood Adhesive System 》Hisham A. Essawy, Heba A. Mohamed Department of Polymers and Pigments, National Research Center, Dokki 12311, Egypt Journal of Applied Polymer Science, Vol. 119, 760–767 (2011)Dendritic polymers are effective adhesion promoter for urea formaldehyde (UF) resin.Dendritic polymers exhibit a high surface activity, at very low concentrations - critical aggregation concentration (CACs), they have the ability to aggregate in the water itself. With PAMAM generation increases, CACs reduces, molecular weight and structure has important impacts for the control of surface activity and CAC. Dendritic polymers are effective adhesion promoter for urea formaldehyde (UF) resin, it may increase the surface wettability due to its large number of surface group. End reactive groups at dendritic polymer chain can form large aggregation through its function when at very low concentrations. Formation of the polymer significantly decreases the surface tension of the aqueous solution. They form their surface activity in the air - water interface. Adding G3-NH3Cl in the urea-formaldehyde resin can significantly improve the adhesion of wood adhesives. Weihai CY Dendrimer Technology Co. Ltd forwards from "Different End Groups, as Adhesion Promoters for Urea-Formaldehyde Wood Adhesive System" Hisham A. Essawy, Heba A. Mohamed Department of Polymers and Pigments, National Research Center, Dokki 12311, Egypt Journal of Applied Polymer Science, V ol. 119, 760-767 (2011)。