【作者】 安全福；

【导师】 高俊刚；

【作者基本信息】 河北大学 ， 高分子化学与物理， 2001， 硕士

【摘要】 一、利用沉淀法制备了粒径在10～50nm之间的Fe₃O₄磁性粒子，考察了分散剂用量对粒子粒径的影响。所得的磁性粒子用聚乙二醇处理，改善了Fe₃O₄磁性粒子与有机单体的亲和性。以水、乙醇为介质，以聚乙二醇为分散剂，以过硫酸钾为引发剂，以聚乙二醇处理的Fe₃O₄为种子制备出苯乙烯与丙烯酸甲酯共聚磁性微球。改变合成条件，可以得到粒径为5～150μm、粒径分散系数在0.1～0.3、磁化率在10^-3cm³/g数量级、内含磁核、磁响应性较强的磁性微球。通过切片法，用扫描电子显微镜（SEM）观察了磁性微球的内部形态和Fe₃O₄在微球内的分布情况；利用傅立叶变换红外光谱表征了磁性微球的结构；分别用原子吸收光谱和磁天平测定了磁性微球中Fe₃O₄的含量及微球的质量磁化率。 把磁性微球进行胺化，得到了表面含有氨基的微球。研究了磁性微球和胺化微球对苯酚的吸附情况，考察了吸附时间、苯酚浓度、微球粒径等因素对吸附量的影响。结果表明，磁性微球和胺化微球对苯酚有明显的吸附作用，且吸附量随着吸附时间的延长而增加，随着苯酚溶液浓度的增大而增加。用扫描电子显微镜结合X-射线能谱仪、傅立叶变换红外光谱对胺化微球进行了表征。 二，用乳液聚合法合成了苯乙烯（St），甲基丙烯酸甲酯（MMA）二元共聚物（PMS），并利用α-甲基苯乙烯（α-MSt）和丙烯酸乙酯（EA）作为改性单体代替部分苯乙烯合成了三元共聚物。用凝胶渗透色谱（GPC）测定了聚合物的分子量及其分布，利用热分析仪测定了聚合物的玻璃转化温度及分解温度，结果表明二元共聚物的玻璃化温度随St质量分数的增加成曲线变化，在MMA占50％时玻璃化温度达到最高值；α-MSt的加入使玻璃化温度升高，EA的加入使玻璃化温度降低。用扭辫分析仪（TBA）和扫描电子显微镜（SEM）研究了共聚物与氯化聚乙烯（CPE）的相容性，结果说明含有α-MSt和EA的共聚物与CPE有较好的相容性。用悬浮聚合法合成了接枝型MCS树脂，讨论了合成条件对接枝效率的影响，接枝效率随CPE含量增加而增加。研究了树脂力学性能、流变性、形态与树脂中CPE含量的关系。更多还原

【Abstract】 In the first part of this paper, magnetic particle Fe304 was synthesized by coprecipitation by dispersion agent polyethelene glycol (PEG). The effect of PEG content and agitator speed on magnetic particle Fe304 diameter was investigated. The magnetic polymer microspheres, having magnetic core and polymer shell, have been synthesized by dispersion copolyrnerization of styrene (St), methacrylate (MA) in the presence of Fe304 modified by PEG. The polymer microspheres, those diameter ranged from 5 to 150 t m, possess good magnetic induction, and can be separated from dispersion medium under magnetic field. The mass magnetic susceptibility and content of Fe304 in the microspheres can be controlled in different polymerization condition. It is shown that PEG, dispersion medium has great effect on the diameter and dispersion parameter of microspheres. The magnetic microspheres and aminated microspheres were used to absorb phenol in solution. The effect of phenol concentration and absorption time on absorption quantity was investigated. The result was shown that the absorption quantity increased with the increasing phenol concentration and absorption time. In the second part of this paper, the bipolymer (P SM) and terpolyrner (PSMEA, PSMIMS) was synthesized by emulsion polymerization. The glass transition temperature (Tgs) of copolyrners and relationship between Tg with components were studied by differential scanning calorimeter (DSC). The results show that TgS of bipolymer have a peak value at about the content of 50%MMA (in wt). When the a MSt was added, TgS of terpolyiner raised with the increasing content of a -MSt, while TgS of tercopolyrner decreased with the increasing content of EA. The therrnostability was determined by thermogravimetric analysis (TGA). The rheological behavior of copolyrner was investigated. The results show the apparent viscosity ri a of terpolymer in melt was dropped as the content of a -MSt or EA increasing and it is the behavior of pseudoplastic liquid. SUM micrographs shown containing a -MSt or EA terpolymers have a good compatibility. MCS resin formed from methyl methacylate (MIN扞A), styrene (St), chlorinated polyethylene (CPU) was synthesized by suspension swelling graft-copolymerization. The synthesis conditions of MCS, the effect of different synthesis conditions on graft efficiency, the mechanical property, rheological behavior and morphology were investigated. The graft efficiency increased with increasing CPE content. The apparent viscosity of melt increased with increasing the content of CPE.更多还原