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6605010 
Journal Article 
Preparation of Armor Structure Polystyrene@Magnesium Hydroxide Composite Microspheres by Pickering Suspension Polymerization with Nano-magnesium Hydroxide as Pickering Stabilizer 
Zhu Pei; Yang Mingshu; Wang Feng; Chen Zheming; Li Gen; Gao Chong; Liu Peng; Ding Yanfen; Zhang Shimin; Chen Juan; , 
2020 
1 
Gaodeng Xuexiao Huaxue Xuebao / Chemical Journal of Chinese Universities
ISSN: 0251-0790 
HIGHER EDUCATION PRESS 
BEIJING 
41 
3 
556-564 
Chinese 
WOS:000525764100021 
The unique properties of organic-inorganic composite microspheres with armor structure have aroused great interest. Armor structure organic-inorganic composite microspheres were prepared by Pickering suspension polymerization using styrene as monomer, azobisisobutyronitrile ( AIBN ) as initiator, magnesium hydroxide nanosheets as Pickering stabilizer. The composite microspheres were characterized by scanning election microscopy ( SEM ) , transmission electron microscopy ( TEM ) , energy dispersive spectroscopy ( EDS ) , Fourier transform infrared spectroscopy ( FTIR) , X-ray diffraction ( XRD) , thermal gravimetric analysis ( TGA ) and micro-scale combustion calorimetry ( MCC) . The morphology and structure of the composite microspheres were confirmed. Magnesium hydroxide was tightly coated on the surface of the polystyrene microspheres to form the armor structure composite microspheres with magnesium hydroxide as the outer layer and polystyrene as the inner sphere. When magnesium hydroxide content was 2% , the average particle size of the microspheres was 25 mu m, much lower than that of pure PS microspheres , 760 mu m. It was also proved that the composite microspheres with armor structure could reduce the heat release rate and inhibit the cracking of polymers. And the acid etching of microspheres could remove completely the outer layer of magnesium hydroxide. This Pickering suspension polymerization is simple to operate, low cost, and the prepared armor composite microspheres have small particle size, narrow distribution and high sphericity. Moreover, the armor structure endows the material with a certain degree of flame retardant performance.