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以1,3-二(3-缩水甘油醚丙基)-1,1,3,3-四甲基二硅氧烷(EDH)和八甲基环四硅氧烷(D4)为原料合成了端环氧硅油(ETSO),以ETSO为原料与葡甲胺胺化得到中间体有机硅嵌段硅油(PTSO),然后用γ-氯丙基三甲氧基硅烷(CPTSO)季铵化改性制备了Bola有机硅季铵盐(BPTSO)。BPTSO的季铵化过程最优合成工艺条件为:反应温度为80℃,物料摩尔比为n(PTSO)∶n(CPTSO)=1∶1.2,反应时间为3 h,PTSO转化率达98.60%。通过FT-IR、1H NMR、TGA、TEM对BPTSO的结构及BPTSO乳液整理后织物的微观形貌进行了表征。测试结果表明:BPTSO乳液的表面张力γ 为29.4 mN/m,临界胶束浓度CMC为0.036 mmol/L,具有囊泡结构和优越的稳定性,经BPTSO乳液整理后的棉织物具有优异的柔软度、白度及亲水性,当BPTSO乳液的用量为60 g/L时,对棉织物的增深率可达到46.5%。 相似文献
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以1,3-二溴金刚烷为起始原料,首先在Lewis酸催化作用下与苯酚发生傅-克烷基化反应生成1,3-二(4-羟苯基)金刚烷(DPAD);DPAD再经Williamson缩合反应和中和反应合成了新型金刚烷基Bola型表面活性剂1,3-二(4-(2-乙氧基磺酸钠)-苯基)金刚烷。采用IR、1H NMR和元素分析等手段确定了各中间物及产物的结构,测试了1,3-二(4-(2-乙氧基磺酸钠)-苯基)金刚烷的表面活性。考察了关键反应步骤(Williamson缩合反应)溶剂、卤代磺烷基化试剂、反应温度、反应时间和物料比对产物收率的影响。在优化的反应条件下,1,3-二(4-(2-乙氧基磺酸钠)-苯基)金刚烷的总收率可达72%。 相似文献
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考察了4个含有季铵头基的Bola两亲分子ArN-n-NAr(n=4,6,8,10)与SDS(十二烷基硫酸钠)混合水溶液的溶液性质。ArN-n-NAr/SDS混合体系表现出在降低表面张力效率(c20)和能力(γCMC)以及胶束生成能力(CMC)的明显增效。c20在混合水溶液中均比单纯组分低,在等电点(0.33)时出现最小值,分别为0.076 mmol/L(n=4),0.048 mmol/L(n=6),0.046 mmol/L(n=8)和0.026 mmol/L(n=10)。与单组分SDS相比,混合体系的CMC出现明显降低,其中ArN-10-NAr/SDS混合体系的CMC比SDS单组分降低了9倍多(从2.40 mmol/L降至0.26 mmol/L)。混合体系中ArN-n-NAr连接链的伸直长度分别为0.635 nm(n=4),0.889 nm(n=6),1.143 nm(n=8)和1.397 nm(n=10),通过与静电平衡距离(0.9 nm)比较得知气/液界面混合吸附层的外表层完全由SDS构成,ArN-n-NAr分子分布在亚表层,依据两头基间连接链长度的不同,ArN-n-NAr(n=4,6,8)采取横躺的方式,ArN-10-NAr采取直立的方式。 相似文献
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Xiaojun Zeng Hanghang Wang Yanhong Chen Liang Wang 《Journal of surfactants and detergents》2015,18(6):1089-1094
Three carbohydrate‐modified polysiloxane bola surfactants (ATPS‐GA) were synthesized using a two‐step method. Their chemical structures were characterized by infrared spectroscopy (FT‐IR) and proton nuclear magnetic resonance spectroscopy (1H NMR). Their surface properties and aggregation properties in aqueous solution were determined using surface tension measurements and transmission electron microscopy (TEM). Surface tension measurement results indicated that the three bola surfactants are under 25 mN m?1, and much lower than those of conventional hydrocarbon bola surfactants due to the siloxane moiety at the end of the hydrophobic chains. TEM analysis results indicated that the ATPS‐GA can self‐assemble into spherical micelles with a wide range of average diameters from 100 nm to above 600 nm. 相似文献
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采用荧光光谱法、紫外吸收光谱法和圆二色谱法研究了在Na2HPO3-NaH2PO3缓冲溶液(pH=7.4,298 K)中三种不同头基的Bola表面活性剂Bola(Me)、Bola(Et)、Bola(Pr)与牛血清蛋白(BSA)的相互作用,考察了表面活性剂浓度、结构对相互作用的影响,初步阐明了Bola表面活性剂与BSA的结合机理. 结果表明:三种Bola表面活性剂均对BSA的荧光强度有静态猝灭作用,并导致其最大发射波长蓝移;表面活性剂的加入主要影响BSA的色氨酸(Trp)残基;表面活性剂头基的烷基链越长,Stern-Volmer?猝灭常数越大,表明具有较长头基烷基链的表面活性剂与BSA具有更强的相互作用. 相似文献
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Bola型表面活性剂是以一根疏水链连接2个亲水基团构成的两亲化合物.介绍了Bola型表面活性剂分子的结构与性能,概述了Bola型双亲表面活性剂与传统表面活性剂相比的优点及其在液相中形成的囊泡的特征.重点介绍了各种类型的Bola型双亲表面活性剂的主要合成方法及用途.最后对其研究前景作了展望. 相似文献
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R. Nagarajan 《Chemical Engineering Communications》1987,55(1):251-273
A bola amphiphile is composed of two polar head groups attached to the ends of a hydrophobic tail. In this paper, the principles of molecular self-assembly of bola amphiphiles are quantitatively established by applying thermodynamic and geometric considerations developed earlier for the more common one-headed amphiphiles. Bola amphiphiles are found to aggregate into spheres, small spherocylinders, large cylinders, small and large discs and vesicles. Inside these aggregates, the hydrophobic tail is expected to assume both a folded and a fully stretched conformation. In general, the presence of the second polar group in a bola amphiphile causes an increase in the aqueous solubility of the amphiphile, an increase in the cmc and a decrease in the aggregation number when compared to the corresponding one-headed amphiphile. The quantitative principles of self-assembly established here can aid in deciding which bola amphiphiles should be synthesized in order to generate desired organized assemblies. 相似文献
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哌嗪系列双子表面活性剂的合成 总被引:5,自引:1,他引:4
为了探索哌嗪类双子表面活性剂在三次采油(EOR)、新材料制备及生物技术领域中的应用,合成了两个以哌嗪为基的双子表面活性剂Ⅰ和Ⅴ,一个含有两种阴离子的Bola型表面活性剂Ⅱ和一个大环表面活性剂Ⅲ。表面张力测定结果显示,Ⅰ的临界胶束浓度(CMC)为6.47×10-4mol/L,优于传统的表面活性剂;Ⅴ的CMC为1.17×10-3mol/L,说明连接基团长度一定时,增加疏水链的数目,表面活性降低。Ⅱ和Ⅲ水溶性较好,可应用于生物技术领域或在新材料中作为模板剂。MM2能量最小法计算结果显示,在有限长连接基团中引入较多疏水链的化合物不易合成。用溶剂可接触面积说明了Ⅲ水溶性较好的原因。 相似文献
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