The uniform surface ion-imprinted resins for Zn2+ as the imprinting guest were prepared by emulsifier-free emulsion polymerization utilizing ally phenyl hydrogenphosphate as a functional comonomer. The Zn2+-imprinted ...The uniform surface ion-imprinted resins for Zn2+ as the imprinting guest were prepared by emulsifier-free emulsion polymerization utilizing ally phenyl hydrogenphosphate as a functional comonomer. The Zn2+-imprinted resin adsorbed Zn2+ much more effectively than did the unimprinted one. The selective feature of the surface imprinted resins to the template ions was demonstrated.展开更多
A series of new water-soluble bifunctional comonomers having both carboxyl and alkyl polyoxyethylene groups, such as sodium mono(ethyl polyoxyethylene) maleate (ZE series) with various molecular weights of polyoxyethy...A series of new water-soluble bifunctional comonomers having both carboxyl and alkyl polyoxyethylene groups, such as sodium mono(ethyl polyoxyethylene) maleate (ZE series) with various molecular weights of polyoxyethylene ethyl ether, were synthesized and characterized. The effects of the structural factor, the amount and feeding mode of the comonomers, the initiator concentration and polymerization temperature on the stability of emulsifier-free emulsion copolymerization of methyl methacrylate (MMA) and butyl acrylate (BA) in the presence of a small amount of ZE with potassium persulfate as initiator were investigated. Stable, almost monodispersed MMA/BA/ZE emulsifier-free latex particles were prepared.展开更多
In this article,AHPS(3-allyloxy-2-hydroxy-1-propanesulfonate salt) was synthesized to use in emulsifier-free emulsion polymerization of BA/BMA/MMA system for high solid content latexes.Storage stability,flow behavior ...In this article,AHPS(3-allyloxy-2-hydroxy-1-propanesulfonate salt) was synthesized to use in emulsifier-free emulsion polymerization of BA/BMA/MMA system for high solid content latexes.Storage stability,flow behavior of the latexes,morphology of the obtained latex particles,dynamic viscoelastic behavior,tensile strength and water resistance properties of the resulted copolymers were investigated.The experimental results show that with the addition of AHPS,stability of the emulsion is greatly improved that there appears no apparent precipitation during the polymerization and storage at room temperature for 6 months and at -10℃ for four months.Flow of the latexes follows the Bingham body laws,diameter of the latex particles is about 0.6μm,of which is larger than that of by conventional emulsion polymerization(0.12μm).In addition,not only water resistance of the copolymers obtained by emulsifier-free emulstion polymerization is greatly improved,but also tensile strength is obviously enhanced.展开更多
The formation mechanism of monodisperse polymer latex particles in the emulsifier-free emulsion polymerizationof methyl methacrylate and butyl acrylate with potassium persulfate as initiator was investigated. A multi-...The formation mechanism of monodisperse polymer latex particles in the emulsifier-free emulsion polymerizationof methyl methacrylate and butyl acrylate with potassium persulfate as initiator was investigated. A multi-step formationmechanism for the monodisperse polymer particles was proposed. The nucleation mechanism is considered to be thecoagulation of the precursor particles by homogeneous nucleation when the primary particles reach a critical size with highsurface charge density and sufficient stability. It had been proved by a special experiment that the early latex particles formedby the coagulation were stable. The primary particles grow by absorbing monomers and radicals in the polymerization systemand then become colloidally unstable again due to the understandable decrease of particle surface charge density, which leadsto the aggregation of the growing particles and the formation of larger latex pedicles therefrom. Aner the nucleation period,the preferential aggregation of the smaller particles in the propagation process leads to the change of the particles towards auniform size and narrower particle size distribution. The coexistence and competition of homogeneous nucleation,coagulation, propagation and aggregation result in the increase of the polydispersity index (U = D_(43)/D_(10)) in the first Stage,then its decrease in the later stage because of the competition of propagation and aggregation, and the gradual formation ofthe monodisperse particles.展开更多
The emulsifier free emulsion polymerization of styrene and N isopropylacrylamide(NIPAM) was successfully carried out with microwave irradiation,and the thermosensitive particles with diameters in the range 130～150?nm...The emulsifier free emulsion polymerization of styrene and N isopropylacrylamide(NIPAM) was successfully carried out with microwave irradiation,and the thermosensitive particles with diameters in the range 130～150?nm were prepared.The effect of temperature on the hydrodynamic diameter of particles was characterized by PCS,the diameter of particles was decreased as the temperature increased from 25℃ to 40℃,and the particles showed thermo reversible phase transition phenomenon at 32℃.The morphology,size and size distribution of the particles were characterized by SEM and PCS.The ordered two dimensional films were prepared by using the capillary force method on the clean glassware wafers,and the morphology of two dimensional films was studied by AFM.展开更多
对由无皂乳液聚合法合成的苯乙烯 丙烯酸丁酯 十一烯酸钠高分子电解质 [P (St BA UA Na+) ]胶乳微球在离子介质中的物理化学行为进行了讨论。利用透射电子显微镜 (TEM)对不同介质条件下胶乳微球的形态、粒径及其分布进行了表征 ,认为 ...对由无皂乳液聚合法合成的苯乙烯 丙烯酸丁酯 十一烯酸钠高分子电解质 [P (St BA UA Na+) ]胶乳微球在离子介质中的物理化学行为进行了讨论。利用透射电子显微镜 (TEM)对不同介质条件下胶乳微球的形态、粒径及其分布进行了表征 ,认为 Na UA参与了 St、BA的共聚合键连于高分子链上可极大地提高乳化效率和乳液的稳定性 ,其用量对乳胶粒径影响较大 ,介质 p H对胶乳粒径分布有较大影响。展开更多
Poly(styrene-acrylic acid) nanoparticles were prepared by emulsifier-free emulsion polymerization under ultrasonic irradiation and characterized by IR and TEM. The results show that the average diameter of the nanopar...Poly(styrene-acrylic acid) nanoparticles were prepared by emulsifier-free emulsion polymerization under ultrasonic irradiation and characterized by IR and TEM. The results show that the average diameter of the nanoparticles is 9 nm. The resonance light scattering peak was at 340 nm and it was greatly enhanced by protein. The nanoparticles are stable, water-soluble and bioactivity. A high sensitive RLS probe for protein determination was proposed.展开更多
基金Financial supported by the Natural Science Foundation of China (No: 50003006)
文摘The uniform surface ion-imprinted resins for Zn2+ as the imprinting guest were prepared by emulsifier-free emulsion polymerization utilizing ally phenyl hydrogenphosphate as a functional comonomer. The Zn2+-imprinted resin adsorbed Zn2+ much more effectively than did the unimprinted one. The selective feature of the surface imprinted resins to the template ions was demonstrated.
文摘A series of new water-soluble bifunctional comonomers having both carboxyl and alkyl polyoxyethylene groups, such as sodium mono(ethyl polyoxyethylene) maleate (ZE series) with various molecular weights of polyoxyethylene ethyl ether, were synthesized and characterized. The effects of the structural factor, the amount and feeding mode of the comonomers, the initiator concentration and polymerization temperature on the stability of emulsifier-free emulsion copolymerization of methyl methacrylate (MMA) and butyl acrylate (BA) in the presence of a small amount of ZE with potassium persulfate as initiator were investigated. Stable, almost monodispersed MMA/BA/ZE emulsifier-free latex particles were prepared.
文摘In this article,AHPS(3-allyloxy-2-hydroxy-1-propanesulfonate salt) was synthesized to use in emulsifier-free emulsion polymerization of BA/BMA/MMA system for high solid content latexes.Storage stability,flow behavior of the latexes,morphology of the obtained latex particles,dynamic viscoelastic behavior,tensile strength and water resistance properties of the resulted copolymers were investigated.The experimental results show that with the addition of AHPS,stability of the emulsion is greatly improved that there appears no apparent precipitation during the polymerization and storage at room temperature for 6 months and at -10℃ for four months.Flow of the latexes follows the Bingham body laws,diameter of the latex particles is about 0.6μm,of which is larger than that of by conventional emulsion polymerization(0.12μm).In addition,not only water resistance of the copolymers obtained by emulsifier-free emulstion polymerization is greatly improved,but also tensile strength is obviously enhanced.
文摘The formation mechanism of monodisperse polymer latex particles in the emulsifier-free emulsion polymerizationof methyl methacrylate and butyl acrylate with potassium persulfate as initiator was investigated. A multi-step formationmechanism for the monodisperse polymer particles was proposed. The nucleation mechanism is considered to be thecoagulation of the precursor particles by homogeneous nucleation when the primary particles reach a critical size with highsurface charge density and sufficient stability. It had been proved by a special experiment that the early latex particles formedby the coagulation were stable. The primary particles grow by absorbing monomers and radicals in the polymerization systemand then become colloidally unstable again due to the understandable decrease of particle surface charge density, which leadsto the aggregation of the growing particles and the formation of larger latex pedicles therefrom. Aner the nucleation period,the preferential aggregation of the smaller particles in the propagation process leads to the change of the particles towards auniform size and narrower particle size distribution. The coexistence and competition of homogeneous nucleation,coagulation, propagation and aggregation result in the increase of the polydispersity index (U = D_(43)/D_(10)) in the first Stage,then its decrease in the later stage because of the competition of propagation and aggregation, and the gradual formation ofthe monodisperse particles.
文摘The emulsifier free emulsion polymerization of styrene and N isopropylacrylamide(NIPAM) was successfully carried out with microwave irradiation,and the thermosensitive particles with diameters in the range 130～150?nm were prepared.The effect of temperature on the hydrodynamic diameter of particles was characterized by PCS,the diameter of particles was decreased as the temperature increased from 25℃ to 40℃,and the particles showed thermo reversible phase transition phenomenon at 32℃.The morphology,size and size distribution of the particles were characterized by SEM and PCS.The ordered two dimensional films were prepared by using the capillary force method on the clean glassware wafers,and the morphology of two dimensional films was studied by AFM.
文摘对由无皂乳液聚合法合成的苯乙烯 丙烯酸丁酯 十一烯酸钠高分子电解质 [P (St BA UA Na+) ]胶乳微球在离子介质中的物理化学行为进行了讨论。利用透射电子显微镜 (TEM)对不同介质条件下胶乳微球的形态、粒径及其分布进行了表征 ,认为 Na UA参与了 St、BA的共聚合键连于高分子链上可极大地提高乳化效率和乳液的稳定性 ,其用量对乳胶粒径影响较大 ,介质 p H对胶乳粒径分布有较大影响。
文摘Poly(styrene-acrylic acid) nanoparticles were prepared by emulsifier-free emulsion polymerization under ultrasonic irradiation and characterized by IR and TEM. The results show that the average diameter of the nanoparticles is 9 nm. The resonance light scattering peak was at 340 nm and it was greatly enhanced by protein. The nanoparticles are stable, water-soluble and bioactivity. A high sensitive RLS probe for protein determination was proposed.
