A series of macroporous silicates with zeolitic microporous frameworks have been successfully prepared by self assembly of discrete colloidal crystals of silicalite 1, titanium silicalite 1(TS 1) and ZSM 5 , using pol...A series of macroporous silicates with zeolitic microporous frameworks have been successfully prepared by self assembly of discrete colloidal crystals of silicalite 1, titanium silicalite 1(TS 1) and ZSM 5 , using polystyrene(PS) spheres as templates. The properties of these novel materials were characterized by means of XRD, IR, SEM, 29 Si MAS NMR and N 2 adsorption/desorption measurements. These materials show ordered spheroidal voids, which are interconnected in three dimensions through windows. The ordering of the macropores are mainly affected by the particle size of the colloidal zeolites. [WT5HZ]展开更多
A series of styrene/acrylamide copolymers were synthesized. The PAm molar fraction in copolymers varies from 1 8% to 33%. Then the C 60 containing copolymers were obtained by the reaction of St/Am copolymer with C 60 ...A series of styrene/acrylamide copolymers were synthesized. The PAm molar fraction in copolymers varies from 1 8% to 33%. Then the C 60 containing copolymers were obtained by the reaction of St/Am copolymer with C 60 in toluene at 30 ℃ and 80 ℃, respectively. The products are orange or brown powders and soluble in common solvents, such as CH 2Cl 2, CHCl 3, toluene, THF etc .. The C 60 moiety in copolymers varies from 0 49% to 1 45%(weight percentage ratio). The results also show that with the increase of mole percentage of amide group in copolymers, the weight percentage of C 60 increases while the C 60 /amide mole ratios in copolymers decline. In addition, raising the reaction temperature enhances the reactivity. The UV Vis spectra show that C 60 containing copolymers have a stronger adsorption from 400 nm to 500 nm than pure C 60 and C 60 doped copolymers have. Increasing the C 60 content in those samples, the characteristic peak of C 60 at 330 nm was suppressed gradually by a strong wide adsorption band from 290 nm to 350 nm, which reveals that amide group can react with C 60 and the C 60 is chemically bonded to the copolymers.展开更多
The C60 grafted poly(N-vinyl carbazole) (PVK) polymer(CGP) was prepared by simple radical polymerization initiated by BPO at 90℃.The products were characterized by UV-Vis, FTIR, GPC and fluorescence and it was proven...The C60 grafted poly(N-vinyl carbazole) (PVK) polymer(CGP) was prepared by simple radical polymerization initiated by BPO at 90℃.The products were characterized by UV-Vis, FTIR, GPC and fluorescence and it was proven that C60 was grafted covalently to the PVK. The C60 moiety in the product was about 1. 2% (mass fraction). The photoconductlvity study revealed that the photoconductivity of PVK was improved obviously through grafting C60.The half time of light decaying (t1/2) of CGP reached 0. 35 s.展开更多
文摘A series of macroporous silicates with zeolitic microporous frameworks have been successfully prepared by self assembly of discrete colloidal crystals of silicalite 1, titanium silicalite 1(TS 1) and ZSM 5 , using polystyrene(PS) spheres as templates. The properties of these novel materials were characterized by means of XRD, IR, SEM, 29 Si MAS NMR and N 2 adsorption/desorption measurements. These materials show ordered spheroidal voids, which are interconnected in three dimensions through windows. The ordering of the macropores are mainly affected by the particle size of the colloidal zeolites. [WT5HZ]
文摘A series of styrene/acrylamide copolymers were synthesized. The PAm molar fraction in copolymers varies from 1 8% to 33%. Then the C 60 containing copolymers were obtained by the reaction of St/Am copolymer with C 60 in toluene at 30 ℃ and 80 ℃, respectively. The products are orange or brown powders and soluble in common solvents, such as CH 2Cl 2, CHCl 3, toluene, THF etc .. The C 60 moiety in copolymers varies from 0 49% to 1 45%(weight percentage ratio). The results also show that with the increase of mole percentage of amide group in copolymers, the weight percentage of C 60 increases while the C 60 /amide mole ratios in copolymers decline. In addition, raising the reaction temperature enhances the reactivity. The UV Vis spectra show that C 60 containing copolymers have a stronger adsorption from 400 nm to 500 nm than pure C 60 and C 60 doped copolymers have. Increasing the C 60 content in those samples, the characteristic peak of C 60 at 330 nm was suppressed gradually by a strong wide adsorption band from 290 nm to 350 nm, which reveals that amide group can react with C 60 and the C 60 is chemically bonded to the copolymers.
文摘The C60 grafted poly(N-vinyl carbazole) (PVK) polymer(CGP) was prepared by simple radical polymerization initiated by BPO at 90℃.The products were characterized by UV-Vis, FTIR, GPC and fluorescence and it was proven that C60 was grafted covalently to the PVK. The C60 moiety in the product was about 1. 2% (mass fraction). The photoconductlvity study revealed that the photoconductivity of PVK was improved obviously through grafting C60.The half time of light decaying (t1/2) of CGP reached 0. 35 s.
