Effects of fluoroalkyl chain length and added moles of oxyethylene on aggregate formation of branched-tail fluorinated anionic surfactants
Effects of fluoroalkyl chain length and added moles of oxyethylene on aggregate formation of branched-tail fluorinated anionic surfactants
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氟烷基链长和环氧乙烷添加量对支尾含氟阴离子表面活性剂聚集体形成的影响
DOI：
10.1016/s0927-7757(01)00501-5
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
M. Abe
中科院分区：
文献类型：
--
作者：
Masanobu Sagisaka;A. Ito;Y. Kondo;N. Yoshino;K. Kwon;H. Sakai;M. Abe
研究了氟碳链长和氧乙烯链长对新合成的双链型含氟阴离子表面活性剂聚集体形成的影响。发现添加两摩尔氧乙烯 (nFS(EO)2) 的双链型氟化阴离子表面活性剂的溶液性质取决于氟碳链长度。因此，克拉夫特温度随着氟碳链长度的增加而急剧升高，而达到最低表面张力或形成聚集体的浓度随着链长度的增加而降低。相比之下，对于添加了两摩尔以上氧乙烯(nFS(EO)4)的双链型氟化阴离子表面活性剂，其溶液性质几乎不受氟碳链长度的影响。也就是说，当链长改变时，表明最低表面张力或聚集体形成的浓度几乎没有变化，而所有成员的克拉夫特温度都低于0°C，这为它们提供了高水溶性。另外，在nFS(EO) 4 溶液中观察到自发囊泡形成，并且由此形成的囊泡的尺寸分布具有多个峰(离散尺寸分布)。
The effects of fluorocarbon chain length and oxyethylene chain length were examined on the aggregate formation of newly synthesized double chain-type fluorinated anionic surfactants. The solution properties of double chain-type fluorinated anionic surfactants with two moles of added oxyethylene (nFS(EO)2) were found to depend on the fluorocarbon chain length. Thus, the Krafft temperature rose abruptly as the length of fluorocarbon chain increased, while the concentration at which the lowest surface tension is attained or aggregates are formed lowered with increasing chain length. In contrast, for double chain-type fluorinated anionic surfactants with two more moles of added oxyethylene (nFS(EO)4), their solution properties were almost inaffected by fluorocarbon chain length. That is, almost no change was seen in the concentration that indicates the lowest surface tension or aggregate formation when the chain length was altered, whereas the Krafft temperature was below 0°C for all members, providing them with a high solubility in water. In addition, spontaneous vesicle formation was observed in solution of nFS(EO)4and the size distribution of the vesicles thus formed had plural peaks (discrete size distribution).