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Adsorption and Aggregation Properties of Homogeneous Polyoxypropylene–Polyoxyethylene Alkyl Ether Type Nonionic Surfactants
Langmuir ( IF 3.7 ) Pub Date : 2017-04-04 00:00:00 , DOI: 10.1021/acs.langmuir.7b00104 Shiho Yada 1 , Toshiyuki Suzuki 2 , Satoru Hashimoto 2 , Tomokazu Yoshimura 1
Langmuir ( IF 3.7 ) Pub Date : 2017-04-04 00:00:00 , DOI: 10.1021/acs.langmuir.7b00104 Shiho Yada 1 , Toshiyuki Suzuki 2 , Satoru Hashimoto 2 , Tomokazu Yoshimura 1
Affiliation
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Homogeneous polyoxypropylene (PO)–polyoxyethylene (EO) alkyl ether type nonionic surfactants comprising alkyl, EO, and PO chains with identical chain length distributions (CnEOxPOy; alkyl chain length n = 10, 12, 14, or 16; EO chain length x = 4, 6, or 8; and PO chain length y = 1, 2, or 3) were synthesized from homogeneous polyoxyethylene alkyl ether bromide and monosodium polyoxypropylene by Williamson ether synthesis. The adsorption and aggregation properties of these surfactants were characterized (cloud point, surface tension, dynamic light scattering, small-angle X-ray scattering, polarization microscopy, and cryogenic transmission electron microscopy) and compared to those of conventional homogeneous EO alkyl ether type nonionic surfactants (CnEOx). The introduction of a PO chain to the EO terminal group of the CnEOx species lowered the cloud points, especially for x = 6. Contrary to our expectations, the CnEOxPOy surfactants adsorbed efficiently at the air/water interface, despite their complex structure (hydrophobic alkyl chain/hydrophilic EO chain/hydrophobic PO chain). They also displayed excellent micelle-forming ability in solution. Furthermore, the CnEOx species formed small micelles in solution at low concentrations and the structures transformed to hexagonal liquid crystals as the surfactant concentration increased. Conversely, CnEOxPOy maintained a micellar structure even at high concentrations. Notably, the introduction of a PO chain into the CnEOx surfactant controlled the formation of aggregates with a higher-order structure (hexagonal liquid crystals).
中文翻译：
均相聚氧丙烯-聚氧乙烯烷基醚型非离子表面活性剂的吸附和聚集性质
均相的聚氧丙烯（PO）-聚氧乙烯（EO）烷基醚型非离子表面活性剂，包含具有相同链长分布的烷基，EO和PO链（C n EO x PO y；烷基链长n = 10、12、14或16； EO链长x = 4、6或8； PO链长y通过均相的聚氧乙烯烷基醚溴化物和聚氧丙烯单钠通过Williamson醚合成法合成1、2或3）。表征了这些表面活性剂的吸附和聚集特性（浊点，表面张力，动态光散射，小角X射线散射，偏振显微镜和低温透射电子显微镜），并与常规均质EO烷基醚型非离子表面活性剂进行了比较。表面活性剂（C n EO x）。在C n EO x物种的EO末端基团中引入PO链降低了浊点，尤其是对于x = 6而言。与我们的预期相反，C n EO x POy尽管表面活性剂结构复杂（疏水性烷基链/亲水性EO链/疏水性PO链），但它们在空气/水界面的吸附效率很高。它们在溶液中还显示出优异的胶束形成能力。此外，C n EO x物种在低浓度下在溶液中形成小的胶束，并且随着表面活性剂浓度的增加，结构转变为六角形液晶。相反，即使在高浓度下，C n EO x PO y仍保持胶束结构。值得注意的是，在C n EO x中引入了PO链 表面活性剂控制着具有更高阶结构的聚集体（六方液晶）的形成。
更新日期：2017-04-04
中文翻译：
均相聚氧丙烯-聚氧乙烯烷基醚型非离子表面活性剂的吸附和聚集性质
均相的聚氧丙烯（PO）-聚氧乙烯（EO）烷基醚型非离子表面活性剂，包含具有相同链长分布的烷基，EO和PO链（C n EO x PO y；烷基链长n = 10、12、14或16； EO链长x = 4、6或8； PO链长y通过均相的聚氧乙烯烷基醚溴化物和聚氧丙烯单钠通过Williamson醚合成法合成1、2或3）。表征了这些表面活性剂的吸附和聚集特性（浊点，表面张力，动态光散射，小角X射线散射，偏振显微镜和低温透射电子显微镜），并与常规均质EO烷基醚型非离子表面活性剂进行了比较。表面活性剂（C n EO x）。在C n EO x物种的EO末端基团中引入PO链降低了浊点，尤其是对于x = 6而言。与我们的预期相反，C n EO x POy尽管表面活性剂结构复杂（疏水性烷基链/亲水性EO链/疏水性PO链），但它们在空气/水界面的吸附效率很高。它们在溶液中还显示出优异的胶束形成能力。此外，C n EO x物种在低浓度下在溶液中形成小的胶束，并且随着表面活性剂浓度的增加，结构转变为六角形液晶。相反，即使在高浓度下，C n EO x PO y仍保持胶束结构。值得注意的是，在C n EO x中引入了PO链 表面活性剂控制着具有更高阶结构的聚集体（六方液晶）的形成。
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