Synthesis of nano-SiO_2/PSt via miniemulsion polymerization and modification of polyacrylate sizes with it

Nano-SiO2 particles were prepared via sol-gel method and then coupled by MPS.Preparation of nano-SiO2/PSt microspheres microspheres was undertaken by miniemulsion using styrene as monomer,CTAB as emulsifier and cyclohexane as co-stabilizer.A series of nano-SiO2/PSt miniemulsion,with different stability and particle size,were prepared with different contents of emulsifier.Nano-SiO2 and nano-SiO2/PSt were characterized.The results showed that: the average particle size of MPS-modified Nano-SiO2 was 38.7 nm;when the content of CTAB was 0.035 g,the prepared miniemulsion,with an average particle size of 148.8 nm,had a good stability and a narrow particle size distribution.Then the prepared miniemulsion was charged into the polyacrylate sizing agent SX-5 to form the nano-modified SX-5.The viscosities of SX-5 and nano-modified SX-5 were determined.Finally,T/C blended single yarns were sized by these two sizing agents,respectively,and properties of the sized yarns were examined.The results showed that: there was tiny difference of viscosity between SX-5 and nano-modified SX-5,but the sizing rate of nano-modified SX-5 improved by 8.9%;and the breaking strength,breaking elongation and abrasion resistance of T/C yarns sized by nano-modified SX-5 improved by 4.7%,-6.5% and 7.0%,respectively as compared with SX-5.