【作者】 朱金丽；

【导师】 房宽峻；

【作者基本信息】 青岛大学 ， 纺织化学与染整工程， 2003， 硕士

【摘要】 通过自由基溶液聚合法，以甲基丙烯酸甲酯、马来酸酐为单体，合成了超细颜料水性体系用高分子分散剂。并且运用红外光谱法、核磁共振(~1H NMR)及凝胶色谱法对共聚物的结构进行了表征，运用分光光度计法、扫描电镜(SEM)、粒径测定和Zeta电位测定等方法对其应用性能进行了研究。 实验结果表明，高分子分散剂MMH是甲基丙烯酸甲酯-马来酸酐共聚物的部分水解物；聚合物中甲基丙烯酸甲酯与马来酸酐的摩尔比为3：1；分子量为45,103，具有较窄的分子量分布。 应用实验表明，实验合成的MMH高分子分散剂应用于超细颜料在水性体系中的分散，具有良好的分散效果。共聚物中马来酸酐含量在25.5左右时，分散效果较好，此时单体比例为甲基丙烯酸甲酯/马来酸酐为1.5：1。分散剂的用量增加，分散体系的稳定性先增加后减小。与传统的分散剂相比较，MMH在对颜料的分散中，具有较好的分散稳定性性能。颜料分散液的扫描电镜图表明，加入MMH后颜料在水性体系中的分散更加均匀，颜料颗粒变小。高分子分散剂MMH对颜料进行分散时，空间阻碍与静电斥力同时存在，马来酸酐溶剂化链提供了足够的亲水性，聚甲基丙烯酸甲酯锚固基团提供了足够的与颜料间的结合力，有效地阻止了颜料粒子的重新聚集。更多还原

【Abstract】 Copolymer of methyl methacrylate and maleic anhydride (MM) was prepared by free radical solution polymerization methods. The structure of copolymer was characterized by techniques of Fourier-Transform Infrared spectroscopy and 1H Nuclear Magnetic Resonance spectroscopy and Gel Permeation Chromatography. The application was studied by techniques of spectrophotometry and particle sizer and zeta meter and Scanning Electron Microscope (SEM).The experimental results showed that the water soluble polymeric dispersant was a partly hydrolyzed MM and the Mol ratio of methyl methacrylate and maleic anhydride in the copolymer was 3:1. Mn was 45,103, and the polydispersity was 1.65.The polymer MMH was a good dispersant for super-fine organic pigment in water. It was found that the best dispersity was achieved when the maleic anhydride was 25 percent in the dispersant and the monomer ratio of maleic anhydride to methyl methacrylate was 1:1.5. The stability increased and then decreased as the dosage of the MMH increased. The dispersity of polymeric dispersant MMH and the traditional dispersants were compared in this paper. It was indicated that the polymeric dispersant had better dispersity than the traditional ones. The SEM of dispersions indicated that the polymeric dispersant made the pigment microparticles smaller and well-distributed. In the dispersion spacial steric hindrance played the effective role besides static repulsion. The polymeric dispersant contained two parts in its molecular structure. One part was solvatable chain, the maleic anhydride, which stretched in the water and formed an adsorption layer with adequate thickness on the pigment surface. Another part was anchoring group, poly(the methyl methacrylate), which could betightly absorbed on the surface of pigment, and this effectively prevented the reconglomeration of pigment particles.更多还原