Analysis of Styrene Polymerization Without Surfactant and N2 Gas in Cylindrical Flask.

The conditions of chemical synthesis can be crucial for polymerization of styrene in such a way that it can be produced latex beads at nanometric range (ϕ < 400nm). In this work, it will be analyzed how the absence of N2 and surfactant will result in colloidal particles with high affinity to agglomerate forming two kinds of nanostructured assemblies: colloidal crystals and nanowires. Four syntheses were realized and four parameters were changed: temperature, impeller speed, and initiator and styrene concentrations. The dispersion was filtered and coated on glass slides by evaporation induced self-assembly (EISA) process. Morphology and topography were observed at Scanning Electron Microscopy (SEM) and Atomic Force Microscope (AFM) respectively. They show how the synthesis conditions play a vital a role on the formation of self assembly nanostructures that can be applied as templates for sensors and biomaterials devices.

化学合成条件对苯乙烯聚合过程至关重要，可制备出粒径处于纳米级（直径φ<400nm）的乳胶微球。本研究将分析排除氮气（N₂）与表面活性剂的条件下，胶体颗粒如何因高团聚倾向形成两类纳米结构组装体：胶体晶体与纳米线。本研究共开展四组合成实验，调控了四项实验参数：反应温度、搅拌桨转速、引发剂浓度与苯乙烯浓度。将所得分散液过滤后，通过蒸发诱导自组装（EISA）工艺涂覆于载玻片表面。分别采用扫描电子显微镜（SEM）与原子力显微镜（AFM）对样品的形貌与表面拓扑结构进行表征。结果表明，合成条件对自组装纳米结构的形成具有关键作用，此类纳米结构可作为传感器与生物材料器件的模板使用。