Applin Samantha I, Schmitz Russell C, Tiemsin Pacita I, Genzer Jan, Connell John W, Wohl Christopher J
Department of Applied Science, The College of William & Mary, Williamsburg, VA, 23185, USA.
Department of Chemical & Biomolecular Engineering, North Carolina State University, Raleigh, NC, 27695, USA.
J Polym Sci A Polym Chem. 2017 Jul 1;55(13):2249-2259. doi: 10.1002/pola.28612. Epub 2017 Apr 20.
Polymeric microspheres have been utilized in a broad range of applications ranging from chromatographic separation techniques to analysis of air flow over aerodynamic surfaces. The preparation of microspheres from many different polymer families has consequently been extensively studied using a variety of synthetic approaches. Although there are a variety of methods of synthesis for polymeric microspheres, free-radical initiated emulsion polymerization is one of the most common techniques. In this work, poly(styrene-co-methyl methacrylate) microspheres were synthesized via surfactant-free emulsion polymerization. The effect of co-monomer composition and addition time on particle size distribution, particle formation, and particle morphology were investigated. Particles were characterized using dynamic light scattering (DLS) and scanning electron microscopy (SEM) to gain further insight into particle size and size distributions. Reaction kinetics were analyzed alongside of characterization results. A particle formation mechanism for poly(styrene-co-methyl methacrylate) microspheres was proposed based on characterization results and known reaction kinetics.
聚合物微球已被广泛应用于从色谱分离技术到空气在空气动力学表面流动分析等众多领域。因此，使用多种合成方法对许多不同聚合物家族的微球制备进行了广泛研究。尽管聚合物微球有多种合成方法，但自由基引发乳液聚合是最常用的技术之一。在这项工作中，通过无表面活性剂乳液聚合合成了聚（苯乙烯 - 甲基丙烯酸甲酯）微球。研究了共聚单体组成和添加时间对粒径分布、颗粒形成和颗粒形态的影响。使用动态光散射（DLS）和扫描电子显微镜（SEM）对颗粒进行表征，以进一步了解粒径和粒径分布。结合表征结果分析了反应动力学。基于表征结果和已知反应动力学，提出了聚（苯乙烯 - 甲基丙烯酸甲酯）微球的颗粒形成机制。
