AUTHOR=Yan Juntao , Wu Hua , Huang Pan , Wang Yourong , Shu Bowang , Li Xiaofang , Ding Deng , Sun Ya , Wang Chunlei , Wu Jian , Sun Linbing 

TITLE=Investigation on the Controllable Synthesis of Colorized and Magnetic Polystyrene Beads With Millimeter Size via In Situ Suspension Polymerization

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.891582

DOI=10.3389/fchem.2022.891582

ISSN=2296-2646

ABSTRACT=<p>A series of colorized and magnetic polystyrene/Fe<sub>3</sub>O<sub>4</sub> (PS/Fe<sub>3</sub>O<sub>4</sub>) composite beads with millimeter size are successfully synthesized by introducing hydrophobic Fe<sub>3</sub>O<sub>4</sub><italic>via in situ</italic> suspension polymerization of styrene for the first time. Effects of the hydrophobic Fe<sub>3</sub>O<sub>4</sub> content, stirring speed, and surfactant dosage on the macromorphology and particle size of PS/Fe<sub>3</sub>O<sub>4</sub> beads are systematically investigated to realize the controllable synthesis. Moreover, three kinds of hydrophobic pigments are also employed to synthesize colorized polystyrene, which demonstrates the versatility, simplicity, and wide applicability of the proposed method. Scanning electron microscopy (SEM) and element mapping (EM) images demonstrated that the hydrophobic Fe<sub>3</sub>O<sub>4</sub> is well dispersed in the polystyrene matrix. Thermogravimetric analysis (TGA) shows that the resultant PS/Fe<sub>3</sub>O<sub>4</sub> beads possess a better thermal stability than neat PS. PS/Fe<sub>3</sub>O<sub>4</sub> beads have a promising application in the fields of colorized extruded PS board, colorized expanded PS foam particle, and board.</p>