writer：Zhengji Chen, Cheng Song, Rui Bai, Zhibo Wei, Faai Zhang
keywords：Mesoporous composite . Polystyrene . SBA-15 . Emulsion Polymerization
source：期刊
specific source：Journal of Polymer Research
Issue time：2012年
Different loading of mesoporous molecular sieve
SBA-15 was used to prepare polystyrene (PS)/SBA-15 composite
materials via in-situ emulsion polymerization. The
influence of SBA-15 silica on the styrene emulsion polymerization
was studied regarding to the monomer conversion,
particle size and particle size distribution, stability and
viscosity of the resulting emulsion. The structure and properties
of the composites were investigated by infrared spectroscopy
(IR), X-ray diffraction (XRD), scanning electron
microscopy (SEM) and gel permeation chromatography
(GPC). In addition, the glass transition temperature (Tg),
thermal mechanical property and thermal stability of the
composite film were measured by differential scanning calorimeter
(DSC), dynamic mechanical analysis (DMA) and
thermogravimetric analysis (TGA), respectively. The results
indicated that the composite emulsion showed high monomer
conversion, thick viscosity, low coagulum, uniform
particle size and broad size distribution. Molecular weight
of the polymer decreased with the increase of mesoporous
silica. SBA-15 silica was dispersed evenly in PS matrix at a
loading of 5 %. The PS/SBA-15 composite material containing
10 % silica maintained a certain ordered structure.
DMA results demonstrated that PS/SBA-15 composite
exhibited greater storage modulus and high Tg compared
to pure PS. The improved thermal stability and Tg of the
composite were also confirmed by the TGA and DSC.