Synthesis of Monodisersed PSt-g-PNIPAAm Nanospheres by UV Initiated Dispersion Polymerization
Ultraviolet(UV) irradiated polymerization is a new way to synthesis of the polymeric nanoparticles due to its security, environmental protection, and low investment, as compared to the thermal-initiated polymerization. In this paper, polystyrene-g- poly(N-isopropylacrylamide) (P(St-g-NIPAAM)) nanospheres were prepared by photo-initiated dispersion copolymerization of St and macromonomers, PNIPAAM with a vinyl end group, in a mixture of ethanol and water using 2,2-dimethoxy-2-phenylacetophenone (BDK) as the photo-initiator. The obtained nanospheres were characterized by scanning electron microscopy (SEM) and laser light scattering (LLS). The results showed that the P(St-g-NIPAAM) particles were highly spherical and monodisperse. The size of the nanospheres could be controlled by changing the concentration of the macromonomers, polymerization temperature, and irradiation time and energy.
Zhong Cao, Lixian Sun, Xueqiang Cao, Yinghe He
W. B. Xiong et al., "Synthesis of Monodisersed PSt-g-PNIPAAm Nanospheres by UV Initiated Dispersion Polymerization", Advanced Materials Research, Vols. 233-235, pp. 2081-2086, 2011