本研究透過無乳化劑聚合法，反應物分別為苯乙烯單體與五羰基鐵，此兩樣反應物屬於有機相，因此可直接透過均相聚合的方式使五羰基鐵與苯乙烯單體聚合成聚苯乙烯鐵核奈米粒子[1]。
本篇研究成功製備出含有鐵的聚苯乙烯奈米粒子，以不同的五羰基鐵濃度聚合均能獲得粒徑均一的奈米粒子，通過Zeta-potential 表面電位分析，相較於純聚苯乙烯奈米粒子，含鐵的聚苯乙烯奈米粒子擁有更負的電位，因此粒子較為分散且穩定。對聚苯乙烯奈米粒子與含鐵的粒子作粒徑成長隨時間變化的比較，發現加入五羰基鐵可以有效限制粒徑的成長，推測是因為五羰基鐵會與苯乙烯單體有著競爭反應，使得單體間的聚合受到影響。透過GPC分子量分析及玻璃轉移溫度的測定，發現在加入鐵後的粒子的分子量會顯著的降低，玻璃轉移溫度亦為降低，可以共同佐證五羰基鐵和苯乙烯之間的競爭關係。透過XRD結晶分析、FT-IR光譜分析、XPS光譜分析及NMR光譜分析，可以得知五羰基鐵與苯乙烯有著一定的相互作用，並在經過高溫燒結後得到高結晶性的單晶。

The emulsifier-free polymerization approach was applied in this investigation. Styrene monomer and iron pentacarbonyl were the reactants. The organic phase contained these two reactants. As a result, homogeneous polymerization can be used to directly polymerize the monomers of styrene and iron pentacarbonyl.
In this study, iron-cored polystyrene nanoparticles were effectively created. Styrene polymerization with various iron pentacarbonyl concentrations could produce nanoparticles with homogenous particle size. Iron-containing polystyrene nanoparticles have a greater negative potential than pure polystyrene nanoparticles, which makes them more diffused and stable. This is determined by zeta-potential surface potential analysis. The addition of iron pentacarbonyl can effectively limit the growth of particle size, according to a comparison of the particle size growth of polystyrene nanoparticles and iron-containing particles over time. This is likely because iron pentacarbonyl will have a competitive reaction with styrene monomer, affecting the polymerization between monomers. The molecular weight of the particles was significantly reduced after adding iron, and the glass transition temperature was also reduced, which can together prove the competitive relationship between iron pentacarbonyl and styrene. It is possible to determine that iron pentacarbonyl and styrene interact in a specific way by XRD crystallization analysis, FT-IR spectral analysis, XPS spectral analysis, and NMR spectral analysis. And after high temperature sintering, achieve a single crystal with great crystallinity.

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