While WCl_6-Ph_4Sn fails to polymerize 1-phenyl-1-propyne (PP) at room temperature, highmolecular weight (M_w up to 410× 10~3) polymers are obtained in high yields (up to 80%) when thepolymerizations of PP are ca...While WCl_6-Ph_4Sn fails to polymerize 1-phenyl-1-propyne (PP) at room temperature, highmolecular weight (M_w up to 410× 10~3) polymers are obtained in high yields (up to 80%) when thepolymerizations of PP are carried out in the presence of C_(60) using the W catalyst under the same conditions.The polymers are soluble in common organic solvents such as THF, chloroform, and toluene. Molecularstructures of the polymers are characterized by FT-IR, UV, NMR, GPC and XRD, and it is found that C_(60) iscopolymerized with PP. Thus C_(60) plays the dual roles of comonomer and cocatalyst in the polymerizationreaction. C_(60) contents of the copolymers can be easily changed by varying the C_(60) amounts in the feedmixtures. The copolymers effectively limit strong 532 nm laser pulses, whose limiting performance issuperior to that of parent C_(60).展开更多
While WC_16-Ph_4Sn is a poor catalyst for the polymerization of l-phenyl-butyne (PB) at room temperature, it effectively polymerizes PB in the presence of C_(60), giving high molecular weight polymers in high yields. ...While WC_16-Ph_4Sn is a poor catalyst for the polymerization of l-phenyl-butyne (PB) at room temperature, it effectively polymerizes PB in the presence of C_(60), giving high molecular weight polymers in high yields. The polymer is soluble in THF and chloroform and spectroscopic analysis reveals that Coo has copolymerized with PB. Thus, C_(60) plays dual roles of comonomer and cocatalyst in the acetylene polymerization. The copolymers strongly attenuate 532-nm laser pulses, whose limiting performance is superior to that of parent C_(60)展开更多
We synthesized C60 quantum dots(QDs) with a uniform size by a modified ultrasonic process and studied its polymerization under high pressure and high temperature(HPHT).Raman spectra showed that a phase assemblage of a...We synthesized C60 quantum dots(QDs) with a uniform size by a modified ultrasonic process and studied its polymerization under high pressure and high temperature(HPHT).Raman spectra showed that a phase assemblage of a dimer(D) phase(62 vol%) and a one-dimensional chain orthorhombic(O) phase(38 vol%) was obtained at 1.5 GPa and 300℃.At 2.0 GPa and 430℃,the proportion of the O phase increased to 46 vol%,while the corresponding D phase decreased to 54 vol%.Compared with bulk and nanosized C60,C60 QDs cannot easily form a high-dimensional polymeric structure.This fact is probably caused by the small particle size,orientation of the disordered structure of C60 QDs,and the barrier of oxide function groups between C60 molecules.Our studies enhance the understanding of the polymerization behavior of low-dimension C60 nanomaterials under HPHT conditions.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
To achieve well defined amphiphilic C 60 containing macromolecules,C 60 conjugated polystyrene(C 60 PS)was first synthesized via tandem atom transfer radical polymerization(ATRP).With the help of tetrabutylammonium br...To achieve well defined amphiphilic C 60 containing macromolecules,C 60 conjugated polystyrene(C 60 PS)was first synthesized via tandem atom transfer radical polymerization(ATRP).With the help of tetrabutylammonium bromide(TBAB),taurine(2 aminoethanesulfonic acid) can be carried from water phase into the phenyl chloride phase and then react with C 60 PS.The final product——taurine modified C 60 conjugated polystyrene—is a novel type of highly asymmetric amphiphilic diblock copolymers,which can form spherical crew cut type micelles by adding water in small amounts into its tetrahydrofuran solution.UV vis spectroscopy and trasmission electronic microscopy have been employed to monitor the aggregating process of these spherical micelles and observe their final morphology respectively.展开更多
基金This work was in part supported by the Hong Kong Research Grants Council(HKUST6062/98P and DAG96/97 SC11).
文摘While WCl_6-Ph_4Sn fails to polymerize 1-phenyl-1-propyne (PP) at room temperature, highmolecular weight (M_w up to 410× 10~3) polymers are obtained in high yields (up to 80%) when thepolymerizations of PP are carried out in the presence of C_(60) using the W catalyst under the same conditions.The polymers are soluble in common organic solvents such as THF, chloroform, and toluene. Molecularstructures of the polymers are characterized by FT-IR, UV, NMR, GPC and XRD, and it is found that C_(60) iscopolymerized with PP. Thus C_(60) plays the dual roles of comonomer and cocatalyst in the polymerizationreaction. C_(60) contents of the copolymers can be easily changed by varying the C_(60) amounts in the feedmixtures. The copolymers effectively limit strong 532 nm laser pulses, whose limiting performance issuperior to that of parent C_(60).
文摘While WC_16-Ph_4Sn is a poor catalyst for the polymerization of l-phenyl-butyne (PB) at room temperature, it effectively polymerizes PB in the presence of C_(60), giving high molecular weight polymers in high yields. The polymer is soluble in THF and chloroform and spectroscopic analysis reveals that Coo has copolymerized with PB. Thus, C_(60) plays dual roles of comonomer and cocatalyst in the acetylene polymerization. The copolymers strongly attenuate 532-nm laser pulses, whose limiting performance is superior to that of parent C_(60)
基金Project supported by the National Key R&D Program of China(Grant No.2018YFA0305900)the National Natural Science Foundation of China(Grant Nos.11634004 and 11404036)+2 种基金“the 13th Five-year”Planning Project of Jilin Provincial Education Department Foundation,China(Grant No.20190504)JLU Science and Technology Innovative Research Team,China(Grant No.2017TD-01)Natural Science Foundation of Chang-chun Normal University,China(Grant No.2014-001).
文摘We synthesized C60 quantum dots(QDs) with a uniform size by a modified ultrasonic process and studied its polymerization under high pressure and high temperature(HPHT).Raman spectra showed that a phase assemblage of a dimer(D) phase(62 vol%) and a one-dimensional chain orthorhombic(O) phase(38 vol%) was obtained at 1.5 GPa and 300℃.At 2.0 GPa and 430℃,the proportion of the O phase increased to 46 vol%,while the corresponding D phase decreased to 54 vol%.Compared with bulk and nanosized C60,C60 QDs cannot easily form a high-dimensional polymeric structure.This fact is probably caused by the small particle size,orientation of the disordered structure of C60 QDs,and the barrier of oxide function groups between C60 molecules.Our studies enhance the understanding of the polymerization behavior of low-dimension C60 nanomaterials under HPHT conditions.
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To achieve well defined amphiphilic C 60 containing macromolecules,C 60 conjugated polystyrene(C 60 PS)was first synthesized via tandem atom transfer radical polymerization(ATRP).With the help of tetrabutylammonium bromide(TBAB),taurine(2 aminoethanesulfonic acid) can be carried from water phase into the phenyl chloride phase and then react with C 60 PS.The final product——taurine modified C 60 conjugated polystyrene—is a novel type of highly asymmetric amphiphilic diblock copolymers,which can form spherical crew cut type micelles by adding water in small amounts into its tetrahydrofuran solution.UV vis spectroscopy and trasmission electronic microscopy have been employed to monitor the aggregating process of these spherical micelles and observe their final morphology respectively.
