State Key Laboratory of Applied Organic Chemistry and Institute of Polymer Science and Engineering, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People's Republic of China.
IET Nanobiotechnol. 2013 Jun;7(2):63-8. doi: 10.1049/iet-nbt.2012.0021.
The crosslinked polystyrene nanocapsules with controllable crosslinking degree have been prepared by the ultraviolet (UV)-induced photocrosslinking of the polystyrene grafted silica nanoparticles (SN-PS), which was obtained by the surface-initiated atom transfer radical polymerisation of styrene from the modified silica nanoparticle templates, after the silica templates were etched with hydrofluoric acid. The effect of the UV-irradiating time on the inner diameter of the nanocapsules, and the degree of crosslinking and the thickness of the shells was investigated. The dynamic light scattering results showed that the degree of crosslinking of the obtained nanocapsules increased with the prolongation of the UV-irradiation time, therefore the inner diameter of the nanocapsules increased. However, the percentage of grafting of the crosslinked polymer shells decreased with increasing the UV-irradiation time because of the photodecomposition of the polystyrene grafted during the UV-irradiated crosslinking process, according to the thermogravimetric analysis.
具有可控交联度的交联聚苯乙烯纳米胶囊是通过紫外（UV）光引发聚苯乙烯接枝硅纳米粒子（SN-PS）的光交联反应制备的，SN-PS 是通过苯乙烯在改性硅纳米粒子模板上的表面引发原子转移自由基聚合反应得到的，然后用氢氟酸刻蚀硅纳米粒子模板。考察了 UV 辐照时间对纳米胶囊的内径、交联度和壳层厚度的影响。动态光散射结果表明，随着 UV 辐照时间的延长，得到的纳米胶囊的交联度增加，因此纳米胶囊的内径增大。然而，根据热重分析，由于在 UV 辐照交联过程中聚苯乙烯接枝的光分解，交联聚合物壳的接枝率随着 UV 辐照时间的增加而降低。
