writer：Fa-ai ZHANG, Yun-pu WANG, Chun-peng CHAI
keywords：styrene-acrylic emulsion; emulsion; polymerization; SiO2; nanoparticles
source：期刊
specific source：Polymer International
Issue time：2004年

A styrene-acrylic/SiO2 nanoparticle composite emulsion was prepared by using SiO2
nanoparticles as seeds. The effect of factors such as the level of nano-SiO2, reaction temperature
and ultrasound treatment of nano-SiO2 on the stability of the polymerization reaction was investigated.
Water-resistance of the emulsion was measured. The level of nano-SiO2 in the emulsion was determined by
inductively coupled plasma (ICP) spectrometry. The particlemorphology of the emulsion with nano-SiO2
was observed with transmission electron microscopy (TEM). The kinetics of the polymerization was also
studied at various temperatures and various levels of nano-SiO2. They showed that the level of nano-SiO2
and reaction temperature had a great influence on the monomer conversion, particle size, coagulum
content and viscosity of the emulsion. Nano-SiO2 treated by ultrasonics can increase the coagulum
content greatly, but it does not improve the water resistance of the emulsion. The level of nano-SiO2 in the
emulsion was lower than the theoretical value. The reaction kinetics indicated that the level of nano-SiO2
had less influence on the reaction rate than the reaction temperature. Even a small amount of nano-SiO2
can decrease the reaction rate.