A facile and effective method was successfully developed to prepare the highly cross-linked monodispersed PS particles via soap-free emulsion polymerization, in which the cross-linking agent (DVB) was delayed addition by varying time (Delayed Addition Method, DAM). Through this method, the highly cross-linked monodispersed particles with functional groups on its surface can be prepared. The particles prepared by DAM had a uniform size distribution for the St/DVB and St/HEMA/DVB system. For the St/DVB system, when the cross-linking agent (DVB) was added delay 3 or 7 h, cross-linked PS particles could be successfully prepared without a significant change in the narrow particle size distribution even containing up to 40 wt% of DVB. Similarly, for the St/HEMA/DVB system, by delayed addition of DVB for 3 h, stable and monodispersed polymer particles still could be prepared even the containing of DVB reach to 60 wt%. Moreover, when the feed composition of the DVB kept constant, the longer the delayed addition time of DVB, the better the monodispersity of the cross-linked particles were.
HEMA Dispersion Polymerization Polystyrene Particle Narrow Particle Size Distribution Secondary Nucleation
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This work was supported by the National Science Foundation of China (Grant No. 20674009 and 20728404), the National Science Fund for Distinguished Young Scholars of China (50525310), the Cultivation Fund of the Key Scientific and Technical Innovation Project, Ministry of Education of China (No.707023) and Shanghai Leading Academic Discipline Project, Project Number: B113.
Urban D, Takamura K (2002) Polymer dispersions and their industrial applications. Wiley-VCH, Weinheim, p 408CrossRefGoogle Scholar