在甲醇钠催化下,丁二酸二甲酯与N,N-二甲基乙醇胺进行酯交换反应合成二(二甲基胺基乙基)丁二酸酯,产率91.2%(以丁二酸二甲酯计);再与正溴代十二烷或正溴代十六烷反应合成了两种新型含丁二酸酯基的Gem in i阳离子表面活性剂n-CnH2n+1(CH3...在甲醇钠催化下,丁二酸二甲酯与N,N-二甲基乙醇胺进行酯交换反应合成二(二甲基胺基乙基)丁二酸酯,产率91.2%(以丁二酸二甲酯计);再与正溴代十二烷或正溴代十六烷反应合成了两种新型含丁二酸酯基的Gem in i阳离子表面活性剂n-CnH2n+1(CH3)2N+CH2CH2OCOCH2CH2COOCH2-CH2N+(CH3)2CnH2n+1-n.2B r(n=12或16)[以二(二甲基胺基乙基)丁二酸酯计,产率85%].研究了其在1 M HC l介质中对碳钢的缓蚀效果,结果表明,在1×10-3mol.L-1时,对碳钢的缓蚀效率分别为97.27%和98.10%.展开更多
A cationic gemini surfactant 10-2-10, 1,2-ethane bis(decyl dimethyl ammonium bromide) was synthesized, and the interactions in a mixture of the cationic gemini surfactant with a water-soluble polymer polyvinyl alcohol...A cationic gemini surfactant 10-2-10, 1,2-ethane bis(decyl dimethyl ammonium bromide) was synthesized, and the interactions in a mixture of the cationic gemini surfactant with a water-soluble polymer polyvinyl alcohol(PVA) were investigated by means of viscosity, electric conductivity, surface tension and ultraviolet spectrum measurements. The results showed that PVA displays viscosity behavior of polyelectrolyte-electroviscous effect in an aqueous solution with gemini surfactant 10-2-10 due to the molecular interaction between the polymer and the surfactant. The maximum UV absorption wavelength of polymer-surfactant solution shifted to higher wavelength compared with that of the surfactant, and the conductivity of polymer-surfactant solution increased with increase in concentration of PVA in a certain surfactant concentration. In addition, surface tension of gemini surfactant 10-2-10 solution decreased in the presence of PVA and its critical micelle concentration decreased from 5.9 mmol/L to 4.8 mmol/L in the presence of 1.25×10^-3 g/mL PVA.展开更多
用表面张力法研究了阳离子gemini表面活性剂乙基-1,2-双(十二烷基二甲基溴化铵)(简写为12-2-12)和非离子表面活性剂十二烷基聚氧乙烯醚(C_(12)E_n,其中n=4,10,23)混合体系在气液界面上的吸附行为;用扩张流变技术研究了吸附膜的扩张粘弹...用表面张力法研究了阳离子gemini表面活性剂乙基-1,2-双(十二烷基二甲基溴化铵)(简写为12-2-12)和非离子表面活性剂十二烷基聚氧乙烯醚(C_(12)E_n,其中n=4,10,23)混合体系在气液界面上的吸附行为;用扩张流变技术研究了吸附膜的扩张粘弹行为,实验数据用Lucassen-van den Tempel(LVT)模型进行拟合并根据模型得到了极限弹性值.最后研究了混合体系的泡沫行为,用泡沫塌陷到初始高度一半所对应的时间(t_(1/2))来表征泡沫的稳定性.结果表明,所有的非离子表面活性剂C_(12)E_n均与12-2-12产生了吸引作用.在12-2-12浓度相同的情况下,混合吸附层中吸附分子的最小分子占据面积的顺序为12-2-12/C_(12)E_(23)>12-2-12/C_(12)E_(10)>12-2-12/C_(12)E_4,而极限弹性的顺序为ε_(0,fit)(12-2-12/C_(12)E_4)>ε_(0,fit)(12-2-12/C_(12)E_(10))>ε_(0,fit)(12-2-12/C_(12)E_(23)).与单组分12-2-12形成的吸附膜相比,只有12-2-12/C_(12)E_4形成更加紧密的结构.具有较小亲水头基的非离子表面活性剂C_(12)E_4的加入可增强12-2-12吸附膜的弹性,进而增强了对应体系泡沫的稳定性.展开更多
为了研究Gemini阳离子表面活性剂不同结构是否对低阶煤表面吸附及水煤浆成浆性能有影响,选择Gemini阳离子表面活性剂(C_(12)-3(OH)-C_(12)(SAA-1)和C_(12)-(CH_2)_3-C_(12)(SAA-2))对煤粒表面进行疏水改性,通过对煤粒表面吸附量、水煤...为了研究Gemini阳离子表面活性剂不同结构是否对低阶煤表面吸附及水煤浆成浆性能有影响,选择Gemini阳离子表面活性剂(C_(12)-3(OH)-C_(12)(SAA-1)和C_(12)-(CH_2)_3-C_(12)(SAA-2))对煤粒表面进行疏水改性,通过对煤粒表面吸附量、水煤浆表观粘度和浆体稳定性为考察对象研究其改性效果。结果表明,SAA-2主要以季铵盐的正电荷为活性吸附点,即其饱和吸附量可达到2.95 mg/g,成浆浓度在57%时,表观粘度为723 m Pa·s,接触角为70.89°,Zeta电位为-37.4 mV;SAA-1除了与SAA-2有相同吸附点外,还有羟基与煤粒表面羟基之间的氢键和分子间力的活性吸附点,较SAA-2饱和吸附量增大,可达到3.17 mg/g,成浆浓度在57%时,表观粘度为676 m Pa·s,接触角为85.08°,Zeta电位为-49.6 mV,分散效果最佳。利用Turbiscan Lab稳定性分析仪测得经SAA-1改性水煤浆比SAA-2更稳定。展开更多
文摘在甲醇钠催化下,丁二酸二甲酯与N,N-二甲基乙醇胺进行酯交换反应合成二(二甲基胺基乙基)丁二酸酯,产率91.2%(以丁二酸二甲酯计);再与正溴代十二烷或正溴代十六烷反应合成了两种新型含丁二酸酯基的Gem in i阳离子表面活性剂n-CnH2n+1(CH3)2N+CH2CH2OCOCH2CH2COOCH2-CH2N+(CH3)2CnH2n+1-n.2B r(n=12或16)[以二(二甲基胺基乙基)丁二酸酯计,产率85%].研究了其在1 M HC l介质中对碳钢的缓蚀效果,结果表明,在1×10-3mol.L-1时,对碳钢的缓蚀效率分别为97.27%和98.10%.
文摘A cationic gemini surfactant 10-2-10, 1,2-ethane bis(decyl dimethyl ammonium bromide) was synthesized, and the interactions in a mixture of the cationic gemini surfactant with a water-soluble polymer polyvinyl alcohol(PVA) were investigated by means of viscosity, electric conductivity, surface tension and ultraviolet spectrum measurements. The results showed that PVA displays viscosity behavior of polyelectrolyte-electroviscous effect in an aqueous solution with gemini surfactant 10-2-10 due to the molecular interaction between the polymer and the surfactant. The maximum UV absorption wavelength of polymer-surfactant solution shifted to higher wavelength compared with that of the surfactant, and the conductivity of polymer-surfactant solution increased with increase in concentration of PVA in a certain surfactant concentration. In addition, surface tension of gemini surfactant 10-2-10 solution decreased in the presence of PVA and its critical micelle concentration decreased from 5.9 mmol/L to 4.8 mmol/L in the presence of 1.25×10^-3 g/mL PVA.
基金supported by the National Natural Science Foundation of China(21473032,21273040)~~
文摘用表面张力法研究了阳离子gemini表面活性剂乙基-1,2-双(十二烷基二甲基溴化铵)(简写为12-2-12)和非离子表面活性剂十二烷基聚氧乙烯醚(C_(12)E_n,其中n=4,10,23)混合体系在气液界面上的吸附行为;用扩张流变技术研究了吸附膜的扩张粘弹行为,实验数据用Lucassen-van den Tempel(LVT)模型进行拟合并根据模型得到了极限弹性值.最后研究了混合体系的泡沫行为,用泡沫塌陷到初始高度一半所对应的时间(t_(1/2))来表征泡沫的稳定性.结果表明,所有的非离子表面活性剂C_(12)E_n均与12-2-12产生了吸引作用.在12-2-12浓度相同的情况下,混合吸附层中吸附分子的最小分子占据面积的顺序为12-2-12/C_(12)E_(23)>12-2-12/C_(12)E_(10)>12-2-12/C_(12)E_4,而极限弹性的顺序为ε_(0,fit)(12-2-12/C_(12)E_4)>ε_(0,fit)(12-2-12/C_(12)E_(10))>ε_(0,fit)(12-2-12/C_(12)E_(23)).与单组分12-2-12形成的吸附膜相比,只有12-2-12/C_(12)E_4形成更加紧密的结构.具有较小亲水头基的非离子表面活性剂C_(12)E_4的加入可增强12-2-12吸附膜的弹性,进而增强了对应体系泡沫的稳定性.
文摘为了研究Gemini阳离子表面活性剂不同结构是否对低阶煤表面吸附及水煤浆成浆性能有影响,选择Gemini阳离子表面活性剂(C_(12)-3(OH)-C_(12)(SAA-1)和C_(12)-(CH_2)_3-C_(12)(SAA-2))对煤粒表面进行疏水改性,通过对煤粒表面吸附量、水煤浆表观粘度和浆体稳定性为考察对象研究其改性效果。结果表明,SAA-2主要以季铵盐的正电荷为活性吸附点,即其饱和吸附量可达到2.95 mg/g,成浆浓度在57%时,表观粘度为723 m Pa·s,接触角为70.89°,Zeta电位为-37.4 mV;SAA-1除了与SAA-2有相同吸附点外,还有羟基与煤粒表面羟基之间的氢键和分子间力的活性吸附点,较SAA-2饱和吸附量增大,可达到3.17 mg/g,成浆浓度在57%时,表观粘度为676 m Pa·s,接触角为85.08°,Zeta电位为-49.6 mV,分散效果最佳。利用Turbiscan Lab稳定性分析仪测得经SAA-1改性水煤浆比SAA-2更稳定。
