A rigid colloidal silica template was formed by self-assembly of the monodispersed silica spheres prepared according to Stober method. The silica template is highly ordered, which was verified by bright color effect d...A rigid colloidal silica template was formed by self-assembly of the monodispersed silica spheres prepared according to Stober method. The silica template is highly ordered, which was verified by bright color effect due to Bragg diffraction and the results of SEM. The free radical polymerization of styrene was allowed within the interstices of the rigid template to result in the formation of the three-dimensional periodic silica/polystyrene nano-composites. The titled porous polystyrene was prepared by chemical decomposition of the template with concentrated aqueous hydrofluoric acid. Scanning electron microscopy characterization showed that the macroporous polystyrene has ordered arrays of the uniform pores replicated from the template. Moreover, it was found that the morphology of the as-synthesized macroporous polystyrene was greatly affected by the connectivity of the silica spheres treated under different conditions.展开更多
Filming process of polystyrene nano-latex (NPS) particles was studied by a combination of various methods. For a constant annealing time of 1 h, the AFM images showed that the deformation and sintering temperatures fo...Filming process of polystyrene nano-latex (NPS) particles was studied by a combination of various methods. For a constant annealing time of 1 h, the AFM images showed that the deformation and sintering temperatures for NFS particles were ca. 90 ℃ and 100 ℃ respectively. In spin-lattice relaxation measurements of solid state NMR, it is found that TIL, T1S and /1L/I0 increased significantly after annealing at 90℃ and above. DSC results showed that there was an exothermic peak near Tg after annealing for 1 h at the selected temperatures below 95℃; otherwise, the exothermic peak disappeared after annealing at 100℃ or above. The apparent density of NPS increased suddenly in the temperature range. The results implied that the macromolecules in NPS particles are in a confined state with higher confor-mational energy and less cohensional interactions which are the drive force for the sintering at a lower temperature compared with the multichain PS particles and the bulk polymer.展开更多
The 10^th International Symposium on Polymer Physics was held in Chengdu, China, from June 4^th to 8^th, 2012. This symposium was organized by The State Key Laboratory of Polymer Physics and Chemistry, China, MPI for ...The 10^th International Symposium on Polymer Physics was held in Chengdu, China, from June 4^th to 8^th, 2012. This symposium was organized by The State Key Laboratory of Polymer Physics and Chemistry, China, MPI for Polymer Research, Germany, The University of Massachusetts, USA, and The Hokkaido University, Japan. It was sponsored by the National Natural Science Foundation of China, Beijing National Laboratory for Molecular Sciences, The Chinese Academy of Sciences （CAS）, Institute of Chemistry, CAS, Changchun Institute of Applied Chemistry, CAS, Polymer Division, Chinese Chemical Society, and Sichuan University.展开更多
基金by the National Natural Science Foundation of China (Grant No. 29774038), and the National Key Project for Fundamental Research, "Macromolecular Condensed State" of the Ministry of Science and Technology of China. The support by the Polymer Physics Labor
文摘A rigid colloidal silica template was formed by self-assembly of the monodispersed silica spheres prepared according to Stober method. The silica template is highly ordered, which was verified by bright color effect due to Bragg diffraction and the results of SEM. The free radical polymerization of styrene was allowed within the interstices of the rigid template to result in the formation of the three-dimensional periodic silica/polystyrene nano-composites. The titled porous polystyrene was prepared by chemical decomposition of the template with concentrated aqueous hydrofluoric acid. Scanning electron microscopy characterization showed that the macroporous polystyrene has ordered arrays of the uniform pores replicated from the template. Moreover, it was found that the morphology of the as-synthesized macroporous polystyrene was greatly affected by the connectivity of the silica spheres treated under different conditions.
基金This work was supported by the National Key Project for Fundamental Research the State Science and Technology Commission of China (Grant No. 95-11) and the National Natural Science Foundation of China (Grant Nos. 20004011 and 20023003).
文摘Filming process of polystyrene nano-latex (NPS) particles was studied by a combination of various methods. For a constant annealing time of 1 h, the AFM images showed that the deformation and sintering temperatures for NFS particles were ca. 90 ℃ and 100 ℃ respectively. In spin-lattice relaxation measurements of solid state NMR, it is found that TIL, T1S and /1L/I0 increased significantly after annealing at 90℃ and above. DSC results showed that there was an exothermic peak near Tg after annealing for 1 h at the selected temperatures below 95℃; otherwise, the exothermic peak disappeared after annealing at 100℃ or above. The apparent density of NPS increased suddenly in the temperature range. The results implied that the macromolecules in NPS particles are in a confined state with higher confor-mational energy and less cohensional interactions which are the drive force for the sintering at a lower temperature compared with the multichain PS particles and the bulk polymer.
文摘The 10^th International Symposium on Polymer Physics was held in Chengdu, China, from June 4^th to 8^th, 2012. This symposium was organized by The State Key Laboratory of Polymer Physics and Chemistry, China, MPI for Polymer Research, Germany, The University of Massachusetts, USA, and The Hokkaido University, Japan. It was sponsored by the National Natural Science Foundation of China, Beijing National Laboratory for Molecular Sciences, The Chinese Academy of Sciences （CAS）, Institute of Chemistry, CAS, Changchun Institute of Applied Chemistry, CAS, Polymer Division, Chinese Chemical Society, and Sichuan University.
