Carboxylic ended aliphatic aromatic hyperbranched poly(5 hydroxyethoxyisophthalic acid)(PHEIA) was employed for an electrostatic layer by layer self assembly procedure. The self assembly films have been successfully f...Carboxylic ended aliphatic aromatic hyperbranched poly(5 hydroxyethoxyisophthalic acid)(PHEIA) was employed for an electrostatic layer by layer self assembly procedure. The self assembly films have been successfully formed from both aqueous solution and water THF mixture. The self assembly procedure was monitored by UV Vis spectroscopy and contact angle measurement meter. The obtained multilayers were characterized by AFM for the surface morphology investigation. The results indicate that PHEIA is able to form self assembly film in the presence of poly(diallyldimethylammonium chloride) (PDAC). On the self assembled surface where PHEIA acted as an outmost layer, the PHEIA aggregated into sphere like particles with uniform diameter. Furthermore, the layer by layer self assembly procedure provided a favorable method for modification of the hydrophilicity of the substrate without heavy interpenetration between these two polyelectrolyte layers.展开更多
Hyperbranched poly(ester-amine) with terminal amine groups was synthesized by Michael addition reaction between trimethylolpropanetriacrylate (B 3 monomer) and pizine (A 2 monomer) under molar ratio of 6∶13 via a one...Hyperbranched poly(ester-amine) with terminal amine groups was synthesized by Michael addition reaction between trimethylolpropanetriacrylate (B 3 monomer) and pizine (A 2 monomer) under molar ratio of 6∶13 via a one-step procedure.It was further modified by stearyl chloride to form an amphiphilic hyperbranched polymer.The structures of these polymers were characterized by FT-IR,{}+1H-NMR,DSC and GPC analyses.Due to the existence of interior secondary amines,the modified polymer can be used as phase transferring agent to extract methylic orange from water layer to CHCl-3 layer.Both higher transferring capability and higher transferring rate were achieved at lower pH of the water phase.The extracted dye in the organic layer can be further released to the water layer under a basic condition.A possible mechanism for extracting dye by amphiphilic hyperbranched polymer was suggested.展开更多
Hyperbranched poly(ester-amine) (PEAC) with terminal acrylate groups aggregated into micelles in acidic methanol-water mixed solutions at a volume ratio 1∶100,and the micellar size became large with increasing the so...Hyperbranched poly(ester-amine) (PEAC) with terminal acrylate groups aggregated into micelles in acidic methanol-water mixed solutions at a volume ratio 1∶100,and the micellar size became large with increasing the solution pH value.Self-assembled films were successfully formed from hyperbranched polyester (PMPP) with terminal aromatic carboxylic acid groups and PEAC by layer-by-layer dipping and the process was affected by the pH value of PEAC solutions.With PEAC as the outlayer,further reaction of the self-assembled film based on acrylate groups was investigated.The film was irradiated by UV light and washed by ionizing water.The cured film fell off the substrate seriously due to the highly branched architecture of PEAC and the polymerization of acrylate groups.In addition, the self-assembled film was immersed in aqueous p-phenylenediamine solution for 72?h.Regular spherical particles in diameter of 200?nm were observed on the film surface, which was due to the strong arene-arene interaction of benzene rings introduced into the film surface through Michael addition between acrylate groups and amino groups in p-phenylenediamine.展开更多
利用AFM轻敲模式(tapp ing mode)下的相位成像技术,对PMMA/PBA核壳乳胶及具有相同聚合物组分的共混乳胶成膜后的涂膜形貌进行了比较研究,发现核壳乳胶成膜后,由PMMA组成的硬核呈岛状均匀分布于由PBA组成的软壳融合后形成的连续相中,而...利用AFM轻敲模式(tapp ing mode)下的相位成像技术,对PMMA/PBA核壳乳胶及具有相同聚合物组分的共混乳胶成膜后的涂膜形貌进行了比较研究,发现核壳乳胶成膜后,由PMMA组成的硬核呈岛状均匀分布于由PBA组成的软壳融合后形成的连续相中,而对于共混乳胶,由于乳胶粒子间容易发生聚结,其成膜后PMMA乳胶粒子未能均匀分散形成海岛结构。不同粒子形态的乳胶其涂膜的透光性、摆杆硬度等也存在着明显差别。展开更多
文摘Carboxylic ended aliphatic aromatic hyperbranched poly(5 hydroxyethoxyisophthalic acid)(PHEIA) was employed for an electrostatic layer by layer self assembly procedure. The self assembly films have been successfully formed from both aqueous solution and water THF mixture. The self assembly procedure was monitored by UV Vis spectroscopy and contact angle measurement meter. The obtained multilayers were characterized by AFM for the surface morphology investigation. The results indicate that PHEIA is able to form self assembly film in the presence of poly(diallyldimethylammonium chloride) (PDAC). On the self assembled surface where PHEIA acted as an outmost layer, the PHEIA aggregated into sphere like particles with uniform diameter. Furthermore, the layer by layer self assembly procedure provided a favorable method for modification of the hydrophilicity of the substrate without heavy interpenetration between these two polyelectrolyte layers.
文摘Hyperbranched poly(ester-amine) with terminal amine groups was synthesized by Michael addition reaction between trimethylolpropanetriacrylate (B 3 monomer) and pizine (A 2 monomer) under molar ratio of 6∶13 via a one-step procedure.It was further modified by stearyl chloride to form an amphiphilic hyperbranched polymer.The structures of these polymers were characterized by FT-IR,{}+1H-NMR,DSC and GPC analyses.Due to the existence of interior secondary amines,the modified polymer can be used as phase transferring agent to extract methylic orange from water layer to CHCl-3 layer.Both higher transferring capability and higher transferring rate were achieved at lower pH of the water phase.The extracted dye in the organic layer can be further released to the water layer under a basic condition.A possible mechanism for extracting dye by amphiphilic hyperbranched polymer was suggested.
文摘Hyperbranched poly(ester-amine) (PEAC) with terminal acrylate groups aggregated into micelles in acidic methanol-water mixed solutions at a volume ratio 1∶100,and the micellar size became large with increasing the solution pH value.Self-assembled films were successfully formed from hyperbranched polyester (PMPP) with terminal aromatic carboxylic acid groups and PEAC by layer-by-layer dipping and the process was affected by the pH value of PEAC solutions.With PEAC as the outlayer,further reaction of the self-assembled film based on acrylate groups was investigated.The film was irradiated by UV light and washed by ionizing water.The cured film fell off the substrate seriously due to the highly branched architecture of PEAC and the polymerization of acrylate groups.In addition, the self-assembled film was immersed in aqueous p-phenylenediamine solution for 72?h.Regular spherical particles in diameter of 200?nm were observed on the film surface, which was due to the strong arene-arene interaction of benzene rings introduced into the film surface through Michael addition between acrylate groups and amino groups in p-phenylenediamine.
文摘利用AFM轻敲模式(tapp ing mode)下的相位成像技术,对PMMA/PBA核壳乳胶及具有相同聚合物组分的共混乳胶成膜后的涂膜形貌进行了比较研究,发现核壳乳胶成膜后,由PMMA组成的硬核呈岛状均匀分布于由PBA组成的软壳融合后形成的连续相中,而对于共混乳胶,由于乳胶粒子间容易发生聚结,其成膜后PMMA乳胶粒子未能均匀分散形成海岛结构。不同粒子形态的乳胶其涂膜的透光性、摆杆硬度等也存在着明显差别。
