【摘要】 自制了苯乙烯单封端的聚乙烯醇(PEG)大分子单体,使其与苯乙烯进行无皂乳液聚合,进而制得了单分散的纳米微球。通过核磁共振和傅里叶红外光谱表征了大分子单体及共聚物的组成,用透射电子显微镜和激光光散射观察了微球的形态、直径和分布。并考察了大分子单体用量、引发剂用量和反应温度对微球粒径的影响。结果表明,增加乳液中大分子单体和引发剂的用量,提高聚合反应温度,可以控制微球的粒径大小,得到最小直径约为41nm的纳米微球,该微球保持较好的球形和单分散性。更多还原

【Abstract】 Poly(ethylene glycol)(PEG) macromonomers which have a p-vinylbenzyl end group were synthesized.PEG grafted polystyrene(PEG-g-PS) nanospheres were then prepared by emulsifier-free copolymerization of the PEG macromonomer with styrene in water at 60℃.The structures of PEG macromonomer and PEG-g-PS copolymer were characterized by ~1H-NMR and FTIR.Also,the morphology,particle size and distribution of PEG-gPS nanospheres were observed by TEM and LLS.The influence of the reaction conditions on the particle size and distribution of the nanospheres were investigated,such as concentration of PEG macromonomer,initiator and the reaction temperature.The result showed that the size of the nanospheres can be controlled by increasing the concentration of PEG macromonomer,initiator and reaction temperature.Spherical and monodisperse nanosphers with the diameter of 40nm were obtained.更多还原