共查询到19条相似文献,搜索用时 62 毫秒
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新型磺酸盐型Gemini表面活性剂的合成及其与聚合物相互作用 总被引:1,自引:0,他引:1
以溴代正烷烃、乙二胺、1,3-丙磺内酯合成了一系列新型磺酸盐型Gemini表面活性剂(SGS-8、SGS-10、SGS-12、SGS-14);采用IR、1H NMR及元素分析等手段对合成产物进行结构表征,并研究了其表面活性,采用等温滴定微量热技术、表面张力法和稳态荧光光谱法研究了SGS-12与聚丙烯酰胺(PAM)的相互作用规律及热力学参数。结果表明,合成的产物纯度较高,具有较低的cmc值和较好的表面活性;SGS-12/PAM混合体系的表面张力曲线和芘探针在体系中微极性的变化表明,二者发生相互作用且形成混合胶束;SGS-12与PAM结合是一个由焓驱动的自发过程,△H和△S均小于0,表明相互作用力以氢键和范德华力为主,合成产物在聚丙烯酰胺分子上的平均结合数为287。 相似文献
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PEP型嵌段共聚醚非离子表面活性剂的研究 总被引:4,自引:1,他引:4
以聚乙二醇和环氧丙烷为原料,用常压法合成了一系列氧丙烯—氧乙烯—氧丙烯嵌段共聚醚,对合成产物进行了结构表征,并对产物的浊点、泡沫稳定性、临界胶束浓度、乳化性能等进行了测定。研究结果表明,氧丙烯—氧乙烯—氧丙烯嵌段共聚醚作为非离子表面活性剂,其性能与嵌段序列长度和含量密切相关。 相似文献
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尾链含对硝基苯醚基团的阳离子Gemini表面活性剂的胶束化热力学 总被引:1,自引:0,他引:1
利用等温滴定微量量热法和电导法研究了具有不同疏水链长并且疏水链尾部含有对硝基苯醚基团的Gemini表面活性剂胶束化过程的热力学, 分别利用相分离模型和质量作用模型对观察焓与浓度的关系曲线进行拟合, 获得了胶束化过程的热力学参数. 两种模型获得的胶束化焓一致, 均为较大负值, 而吉布斯自由能却相差较大. 用相分离模型得到的胶束化过程的热容变化均为负值, 并随链长增加绝对值增大, 胶束化过程总的热容变化主要来自非极性的烷基链去水合产生的热容变化, 证明处于疏水链末端的对硝基苯醚基团在表面活性剂形成胶束后依然与水相接触. 质量作用模型获得的胶束聚集数随疏水链长增加逐渐下降, 这是由具有长疏水链的表面活性剂形成预胶束所导致. 相似文献
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二元Pluronic嵌段共聚物相互作用 总被引:2,自引:0,他引:2
用I2探针增溶分光光度法考察二元Pluronic两亲嵌段共聚物在水溶液中的胶束化行为,实验结果表明,对于分子PPO嵌段长度相近的P94/L92和F108/L92二元混合体系,这些分子在全部浓度比例范围内都发生相互作用,生成了混合胶束,由于这些分子的PEO嵌段长度不等,随着具有较短PEO嵌段的L92分子加入,P94/L92和F108/L92混合胶束外壳的EO基团数减少导致水化度降低。对于分子PPO嵌段长度不等的P94/L64二元混合体系,当溶液体当中L64的质量分数wL64<0.4时,由于P94/L64混合预胶束的形成,使P94分子在较高浓度时才生成单组分胶束,当wL64>0.4后,溶液中生成了P94/L64混合胶束,温度升高促进了胶束化行为。 相似文献
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应用荧光探针和zeta电位方法研究了电解质NaBr、NaCl、KCl和有机溶剂乙醇对DNA与Gemini表面活性剂相互作用的影响. DNA诱导的表面活性剂类胶束在较低浓度即可生成, 这一浓度称为临界聚集浓度(CAC). Gemini表面活性剂比具有相同烷烃链长的单体表面活性剂更易聚集, 对应的CAC较低. 实验结果表明, 盐(NaBr)浓度对DNA/表面活性剂体系的CAC影响不大, 阴、阳离子的种类则对该体系有不同程度的影响. 阴离子(Br-、Cl-)对体系的CAC有显著的影响, 但阳离子(Na+、K+)的差异对CAC影响不大. 极性溶剂乙醇对DNA与表面活性剂相互作用的影响比较复杂. 乙醇浓度较低时有利于表面活性剂的聚集, 使得CAC减小; 而浓度较高时, 则不利于表面活性剂聚集,从而使CAC变大. 乙醇可显著改变DNA/表面活性剂复合物的zeta电位. 相似文献
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借助引发剂过硫酸钾(KPS),采用原位聚合法将苯乙烯(St)与Gemini型阳离子分子顺丁烯二酸二乙酯撑基双[辛烷基二甲基氯/溴化铵](G8-2-8)在季铵化壳聚糖(QCS)的醋酸溶液中,引发聚合形成不同嵌段比例(St与G8-2-8的摩尔比)的嵌段聚合物。 然后利用戊二醛(GA)为交联剂将QCS交联形成网状结构,将上述线性嵌段聚合物“锁定”在交联的QCS网状结构中,制备了一系列具有半互穿网络结构(Semi-IPN)的阴离子导电膜。 性能测试的结果表明,该系列膜具有较高的机械性能和电导率。 当G8-2-8含量为QCS质量的20%,嵌段比例为5:1时,表现出最高的离子交换量(1.35 mmol/g),断裂伸长率(26.47%)和电导率(70 ℃,6.97×10-2 S/cm)。 热稳定性测定结果表明,该膜具有良好的热稳定性能,最低分解温度高于210 ℃。 相似文献
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摘要 采用荧光探针法和电导法研究了正离子偶联表面活性剂(C12H25(CH3)2N-(CH2)6-N(CH3)2C12H25•2Br) (12-6-12•
2Br-)和带相反电荷聚电解质聚丙烯酸钠(NaPA)的相互作用, 结果表明: 由于静电相互作用, 12-6-12•2Br-和NaPA之间可以形成类胶束或复合物. 对比十二烷基三甲基溴化铵(DTMAB)与NaPA复配体系的荧光光谱, 发现偶联表面活性剂与NaPA的相互作用强于传统表面活性剂. 此外, 还研究了盐和醇对偶联表面活性剂/聚丙烯酸钠的复配体系微极性的影响, 发现盐和醇对表面活性剂在聚电解质上形成类胶束和复合物的溶解都有一定的促进作用. 相似文献
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Sakshi Tyagi 《Journal of Dispersion Science and Technology》2014,35(9):1308-1318
The interaction of anionic gemini surfactants with other surfactants (such as anionic, cationic, nonionic) was systematically overviewed, paying attention to synergism observed in various properties. These mixed systems were found to show remarkable synergism in micelle formation. The critical micelle formation values being lower than the individual gemini surfactants indicate that the mixed micellization is due to attractive interaction between the two components. Almost all combinations were discussed in terms of respective surface tension reduction effectiveness and surface tension reduction efficiency and aggregation number for evaluation of synergism. 相似文献
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Jie Li Ruihua Zhu Yu Liu Lu Yin Wenxiang Wu 《Journal of Dispersion Science and Technology》2016,37(3):374-379
A new type of sulfonate gemini surfactant with three lipophilic alkyl chains (3C10-DS) was synthesized, and the structure of the product was confirmed by using the infrared spectrum and mass spectrum. Its critical micelle concentration (CMC) is 0.41 mmol/L, one order of magnitude lower than those of convectional (single-chain) surfactants, and the minimum surface tension is 27.6 mN/m. The interfacial tension (IFT) between the compound system of 3C10-DS and petroleum sulfonate (PS) and the simulated oil reaches ultra-low levels (10?3 mN/m), and there exists significant synergistic effect between 3C10-DS and PS. The compound flooding system consisting of polymer and the mixture of 3C10-DS and PS can effectively improve oil recovery for high-medium permeability cores and have a good application prospect in enhancing oil recovery. 相似文献
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Interfacial tensions (IFT) of five alkylbenzene sulfonate Gemini surfactants Ia, Ib, Ic, Id, and Ie at different oils/water systems were measured by a spinning drop interfacial tensiometer. And critical micelle concentration (CMC), the interfacial tension at CMC (γCMC), maximum interfacial excess concentration (Γ max) and the surface area per molecule (Amin) were calculated. The results indicated that the CMC values determined with interfacial tension method were lower than those determined with surface tension method. And γCMC for Ie is larger than that for Ia, Ib, Ic, and Id. In addition, the effects of temperature and hydrophobic chains on dynamic IFT were also studied. With the increment of temperature, dynamic IFT is easier to reach a stable value. However, with the increment of hydrophobic chains, dynamic IFT is more difficult to reach a stable value. Each Gemini surfactant produces a minimum IFT when measured against a different n-alkane. 相似文献
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P. S. Niranjan 《Journal of Dispersion Science and Technology》2013,34(1):109-113
The interaction of polyacrylamide (PAM) with conventional anionic (sodium lauryl sulphate, NaLS) and gemini anionic (sodium salt of bis(1-dodecenyl succinimic acid), represented as NaBDS) surfactants has been studied in alkaline medium by electrical conductance and surface-tension measurements at 350C in order to compare the behavior of two surfactants toward the polymer. The surface parameters and thermodynamic parameters have been evaluated and compared. The results indicate more readily interaction of anionic gemini surfactant with the polymer (PAM). 相似文献
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H. S. Luo N. Wang L. Z. Zhou Y. L. Wang H. K. Yan 《Journal of Dispersion Science and Technology》2013,34(5):787-791
The synthesis method and conditions for the carboxylate Gemini surfactant O,O′‐bis(sodium 2‐lauricate)‐p‐benzenediol (C11pPHCNa) were explored. Surface tension data of the single and mixed systems of catanionic (cationic with anionic) surfactants with different salt concentrations were used to determine the CMC values and to obtain the information of self‐assembly behaviors of the surfactants. Aggregates' morphologies were observed by transmission electron microscopy (TEM) and speculation was made according to the viscosity measurement results. The results show that large spherical aggregates formed in the mixed solution, which tend to transfer into branched and wormlike mixed micelles with the increases of the salt concentration. The viscosity of the mixed solution was found to increase gradually corresponding to the change of the catanionic surfactant mixtures' morphology. 相似文献
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T. S. Banipal A. K. Sood Jaswinder Kaur Kultar Singh 《Journal of Dispersion Science and Technology》2013,34(6):881-887
Mixed micellization behavior of dimeric cationic surfactant ethanediyl-1,2-bis (dimethyldodecylammonium bromide) (12-2-12) with a series of monomeric cationic surfactants dodecyltrimethyl ammonium bromide (DTAB), tetradecyltrimethyl ammonium bromide (TTAB), and cetyltrimethyl ammonium bromide (CTAB) has been studied in aqueous and aqueous polyvinylpyrrolidone (PVP) solutions at 298.15, 308.15, and 318.15 K, respectively, using conductometric method. Various thermodynamic parameters like mixed micelle concentration (Cm), micelle mole fraction (X1), interaction parameter (β), and free energy of mixing (ΔGex) of the mixed systems have been determined and analyzed using Rubingh's regular solution theory. The results indicate that in aqueous solutions the binary mixtures of 12-2-12 with DTAB/TTAB behave nonideally with mutual synergism whereas that with CTAB shows almost ideal behavior at 298.15 K. At 318.15 K, all these binary mixtures exhibit antagonistic behavior. The effect of variation in chain length of alkyltrimethyl ammonium bromide surfactants on the interactions with 12-2-12 have also been evaluated and discussed. 相似文献
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通过电子显微镜观察了阴离子gemini表面活性剂C11- p-PhCNa和阳离子传统表面活性剂DTAB混合体系双水相中囊泡形貌随体系组成和浓度的转变。结果表明,双水相较浓的一相中形成了多层囊泡,囊泡的大小和壁厚随相的组成和浓度而改变,两组分等电荷混合有利于形成较大且壁较厚的囊泡。分析表明, gemini表面活性剂在聚集体中采取的反式构象可能是其容易形成厚壁多层囊泡的重要原因,C11- p-PhCNa联接链上的苯氧基与DTA+之间的p-阳离子相互作用以及两组分相反电性头基之间的静电吸引使囊泡壁的多层结构更加稳定。 相似文献