Polymeric surfactants were prepared by ultrasonic copolymerization of carboxy methyl cellulose (CMC) and alkyl poly(etheroxy) acrylate. The adsorption mechanism of CMC based polymeric surfactants at silica gel/water i...Polymeric surfactants were prepared by ultrasonic copolymerization of carboxy methyl cellulose (CMC) and alkyl poly(etheroxy) acrylate. The adsorption mechanism of CMC based polymeric surfactants at silica gel/water interface was studied by the adsorption isotherms,IR difference spectra. The results show that the adsorptive amount goes up steadily with the increasing of copolymer concentration. Because of multicontact adsorption of copolymers at the surface of silica gel, the strong interaction between copolymers and surface of silica gel (such as hydrogen bond), large amount of polymeric surfactants adsorbs on silica gel. The pH value of copolymer solution plays a great role on adsorption, which indicates that the electrostatic action is the main adsorption mechanism of CMC based polymeric surfactants.展开更多
The micellar conformation of polymeric surfactants based on carboxy methyl cellulose in aqueous solution was studied by dynamic laser scattering and environmental scanning electron microscope. The results show that di...The micellar conformation of polymeric surfactants based on carboxy methyl cellulose in aqueous solution was studied by dynamic laser scattering and environmental scanning electron microscope. The results show that different polymeric surfactants have different micellar conformation. The micelles formed by copolymer A3, B7 and B9 are spheroidal or ellipsoidal. While copolymer A9 which is more hydrophilic forms rod like micelles. At high concentration the micelles in aqueous solution would aggregate and form network structure further. The dependence of micelle size distribution function F(R) on scattering vector confirms again that the micelles of A9 is not like spherical, while the independence of F(R) on scattering angles means B9 molecules forming sphere like micelles.展开更多
本文以水为溶剂,以铈盐或其他变价金属离子为引发剂,在反应温度0±1℃下,使纤维素与乙烯类单体共聚,制得纤维素接枝共聚反应产物,接枝率高达80%以上。就所得共聚产物对水泥浆流变性、稳定性、失水量、稠化时间等性能的影响进行了研...本文以水为溶剂,以铈盐或其他变价金属离子为引发剂,在反应温度0±1℃下,使纤维素与乙烯类单体共聚,制得纤维素接枝共聚反应产物,接枝率高达80%以上。就所得共聚产物对水泥浆流变性、稳定性、失水量、稠化时间等性能的影响进行了研究。结果证明,经接枝改性的纤维素具有更好的耐热性和耐微生物酶解性,对水泥浆有良好的降失水性和分散性,与其他外加剂相容性好,降失水性超过美国哈里伯顿公司的水泥浆降失水剂 Halad 22A,是一种新型水泥浆降失水剂。展开更多
文摘Polymeric surfactants were prepared by ultrasonic copolymerization of carboxy methyl cellulose (CMC) and alkyl poly(etheroxy) acrylate. The adsorption mechanism of CMC based polymeric surfactants at silica gel/water interface was studied by the adsorption isotherms,IR difference spectra. The results show that the adsorptive amount goes up steadily with the increasing of copolymer concentration. Because of multicontact adsorption of copolymers at the surface of silica gel, the strong interaction between copolymers and surface of silica gel (such as hydrogen bond), large amount of polymeric surfactants adsorbs on silica gel. The pH value of copolymer solution plays a great role on adsorption, which indicates that the electrostatic action is the main adsorption mechanism of CMC based polymeric surfactants.
文摘The micellar conformation of polymeric surfactants based on carboxy methyl cellulose in aqueous solution was studied by dynamic laser scattering and environmental scanning electron microscope. The results show that different polymeric surfactants have different micellar conformation. The micelles formed by copolymer A3, B7 and B9 are spheroidal or ellipsoidal. While copolymer A9 which is more hydrophilic forms rod like micelles. At high concentration the micelles in aqueous solution would aggregate and form network structure further. The dependence of micelle size distribution function F(R) on scattering vector confirms again that the micelles of A9 is not like spherical, while the independence of F(R) on scattering angles means B9 molecules forming sphere like micelles.
文摘本文以水为溶剂,以铈盐或其他变价金属离子为引发剂,在反应温度0±1℃下,使纤维素与乙烯类单体共聚,制得纤维素接枝共聚反应产物,接枝率高达80%以上。就所得共聚产物对水泥浆流变性、稳定性、失水量、稠化时间等性能的影响进行了研究。结果证明,经接枝改性的纤维素具有更好的耐热性和耐微生物酶解性,对水泥浆有良好的降失水性和分散性,与其他外加剂相容性好,降失水性超过美国哈里伯顿公司的水泥浆降失水剂 Halad 22A,是一种新型水泥浆降失水剂。
