合成了3种可聚合的1,8-萘酰亚胺衍生物,并研究了其在二甲基亚砜(DMSO)溶液中的光物理性质.这些化合物表现出的光物理性质与其电子环境有关.通过溶胶-凝胶法制备了可聚合1,8-萘酰亚胺衍生物与硅氧烷的共聚物.尽管3种萘酰亚胺衍生物C-4位...合成了3种可聚合的1,8-萘酰亚胺衍生物,并研究了其在二甲基亚砜(DMSO)溶液中的光物理性质.这些化合物表现出的光物理性质与其电子环境有关.通过溶胶-凝胶法制备了可聚合1,8-萘酰亚胺衍生物与硅氧烷的共聚物.尽管3种萘酰亚胺衍生物C-4位的取代基不同,但在3-氨丙基三乙氧基硅烷(APTES)固凝胶中摩尔分数为0.06%时荧光强度均最大.利用29Si MAS NMR对合成材料进行了表征,结果表明,硅氧烷的缩聚程度影响材料的荧光强度,说明材料中荧光单元的分子运动对材料的荧光性能有重要影响.展开更多
With the aim of developing a low-cost and efficient visible-light-driven photocatalyst for radical polymerization,iron-chelating polyimide networks(Fe@MPI)was fabricated by firstly synthesizing photoactive melamine-co...With the aim of developing a low-cost and efficient visible-light-driven photocatalyst for radical polymerization,iron-chelating polyimide networks(Fe@MPI)was fabricated by firstly synthesizing photoactive melamine-containing polyimide(MPI)networks and then incorporating Fe(III)cations into the polymer networks.Fe@MPI exhibits a wide absorption spectrum ranging from 220 to 1250 nm and 3.5 times higher photocurrent intensity as compared with the pristine MPI.Based on its excellent photo-electric properties,Fe@MPI was employed as a recyclable heterogeneous catalyst,providing sufficient activity for the visible-light driven radical polymerization to synthesize poly(methyl methacrylate)with molecular weight up to 31.×10^4 g mol.Taking advantage of the heterogeneous nature of the catalyst,Fe@MPI could be facilely regenerated from the polymerization solution by filtration without an obvious loss of its activity.This research provides a novel recyclable catalyst for visible-light driven radical polymerization.展开更多
A novel morphology-controlled strategy has been developed to fabricate sulfonated graphene/polyaniline （SGEP） nanocomposites by liquid/liquid interracial polymerization. Sulfonated graphene （SGE） sheets were synth...A novel morphology-controlled strategy has been developed to fabricate sulfonated graphene/polyaniline （SGEP） nanocomposites by liquid/liquid interracial polymerization. Sulfonated graphene （SGE） sheets were synthesized and used as both a macromolecular acid dopant and substrate for the polymerization of polyaniline （PANI）, affording the SGEP nanocomposites. The morphology of PAN! in the nanocomposites can be controlled to be either nanorods or nanogranules by varying the synthesis conditions. The morphology of SGEP and the shape of PANI can be tuned by adding an additional dopant and varying the amount of SGE used, and this had a significant influence on the electrochemical performance of the nanocomposites as supercapacitor electrode materials. The SGEP nanocomposite with PANI nanorods exhibited a specific capacitance of 763 F/g with a capacity retention of 96% after 100 cycles and good rate properties. Composites obtained with HCI as an additional acid dopant with two different ratios of SGE to PANI showed higher specific capacitances of 793 and 931 F/g, but lower capacity retention after 100 cycles of 77% and 76%, respectively.展开更多
文摘合成了3种可聚合的1,8-萘酰亚胺衍生物,并研究了其在二甲基亚砜(DMSO)溶液中的光物理性质.这些化合物表现出的光物理性质与其电子环境有关.通过溶胶-凝胶法制备了可聚合1,8-萘酰亚胺衍生物与硅氧烷的共聚物.尽管3种萘酰亚胺衍生物C-4位的取代基不同,但在3-氨丙基三乙氧基硅烷(APTES)固凝胶中摩尔分数为0.06%时荧光强度均最大.利用29Si MAS NMR对合成材料进行了表征,结果表明,硅氧烷的缩聚程度影响材料的荧光强度,说明材料中荧光单元的分子运动对材料的荧光性能有重要影响.
文摘With the aim of developing a low-cost and efficient visible-light-driven photocatalyst for radical polymerization,iron-chelating polyimide networks(Fe@MPI)was fabricated by firstly synthesizing photoactive melamine-containing polyimide(MPI)networks and then incorporating Fe(III)cations into the polymer networks.Fe@MPI exhibits a wide absorption spectrum ranging from 220 to 1250 nm and 3.5 times higher photocurrent intensity as compared with the pristine MPI.Based on its excellent photo-electric properties,Fe@MPI was employed as a recyclable heterogeneous catalyst,providing sufficient activity for the visible-light driven radical polymerization to synthesize poly(methyl methacrylate)with molecular weight up to 31.×10^4 g mol.Taking advantage of the heterogeneous nature of the catalyst,Fe@MPI could be facilely regenerated from the polymerization solution by filtration without an obvious loss of its activity.This research provides a novel recyclable catalyst for visible-light driven radical polymerization.
文摘A novel morphology-controlled strategy has been developed to fabricate sulfonated graphene/polyaniline （SGEP） nanocomposites by liquid/liquid interracial polymerization. Sulfonated graphene （SGE） sheets were synthesized and used as both a macromolecular acid dopant and substrate for the polymerization of polyaniline （PANI）, affording the SGEP nanocomposites. The morphology of PAN! in the nanocomposites can be controlled to be either nanorods or nanogranules by varying the synthesis conditions. The morphology of SGEP and the shape of PANI can be tuned by adding an additional dopant and varying the amount of SGE used, and this had a significant influence on the electrochemical performance of the nanocomposites as supercapacitor electrode materials. The SGEP nanocomposite with PANI nanorods exhibited a specific capacitance of 763 F/g with a capacity retention of 96% after 100 cycles and good rate properties. Composites obtained with HCI as an additional acid dopant with two different ratios of SGE to PANI showed higher specific capacitances of 793 and 931 F/g, but lower capacity retention after 100 cycles of 77% and 76%, respectively.
