Goto, Rempei

Koizumi, Naokazu

Sugano, Takeo

Kyoto University Research Information Repository

TitlePhysico-chemical Properties of Surface Active Agents. (III) :On the Critical Micelle Concentration in AqueousPolyoxyothylene Glycol Alkyl Ether SolutionAuthor(s)Goto, Rempei; Koizumi, Naokazu; Sugano, TakeoCitation京都大学化学研究所報告 (1951), 26: 82-83Issue Date1951-12-10URL http://hdl.handle.net/2433/74317RightType Departmental Bulletin PaperTextversionpublisherKyoto University   These high values of the viscosity  72 and the energy of activation  aEr. were considered to be due to the large hydrodynamic unit in viscous flow and the interaction between molecules.    21. Physico-chemical Properties of Surface Active Agents. (III)   On the Critical Micelle Concentration in Aqueous Polyoxyothylene                 Glycol Alkyl Ether Solution  Rempei Goto,  Naokazu Koizumi and Takeo Sugano                               (Goto Laboratory)    Recently many reports concerning the properties of aqueous ionic detergent solution have been published. And it has been well known that the molecules of the detergent associate into micelles in the aqueous solution above a certain cri-tical concentration, i.e., c.m.c.,    However, the properties of the aqueous solution of the non-ionic detergent has not completely been investigated.    In the present work, the c.m.c. in the aqueous solution of  polyoxyethylene glycol  alkyl ether was examined by the following four different methods, i.e., vis-cosity, density, absorption spectrum, and electrical conductivity method. And the last two methods were carried out in the following procedure.    1) Absorption spectrum of aqueous pinacyanol chloride solution (1.4 x  10-5mo1/1) was measured in the presence of the detergent at room temperature (about 15°C) and it was found that the intensity of the  absorption band maximum in  610mp, increased greatly with addition of the detergent, though this band maximum shif-ted about  'Omit towards longer wave length than in water. The concentration at which the most rapid increase of  this band maximum occured was taken into  con-ciderati on in this case.                               The c.m.c. in aqueous PEAGE solution  Mol/Litre  X103       Method    Tempera_                    ture  P0-8  P0-20  PC-10 PC-13 PC-18 PL-6 PL-20  Viscosity 31°C  7.6 2.6 5.3  Density 31°C  3.8 5.6 7.1 6.4 2.5 6.7 3.3    Absorption  ca.  15°C  —  —   —      Spectrum    Electrical  18°C  5.6  3.9  —      Conductivity     The  same symbols of the detergemt as in the previous reports are  used  in  this  table.                           ( 84   2) The electrical conductivity of the detergent  Solution was measured at  18° C. by adding  KCI. And it was observed that the conductivity value of this solu-tion agreed with that of  KCl solution at a low concentration of the detergent, but above a certain concentration the conductivity value was smaller than that of KC1 solution. The concentration in question in this case was one at which the  devia-tion was first observed.    The results obtained by these methods were summerized in the  following table.    22. Physico-chemical Properties of Serface Active Agents. (IV)              Dielectric Properties of Polyoxyethylene                    Glycol mono-Alkyl Ethers Naokazu  Koizumi                                 (Goto Laboratory)   As the PEGAE is a non-ionic surface active agent and its hydrophilic property is due to a large polar group, i.e. the chain of  polyethylene oxide, it is desirable to examine the dielectric properties of the PEGAE. So in the present work the dielectric constant  Et and loss  E" for each sample were measured with the suscept-ance variation method over the frequency range 3-30 Mc. and at a range of temperatures from  35° to 65°C. The  observed values of  E' were given in the following table.       Temp. P0-8  P0-20  PC-10 PC-13 PC-18 PL-6  PL-  20          (r')Freq. (1V14                 3 6.00 7.77 6.70 6.81 6.39 7.31 7.81        40 10 5.87 7.40 6.45 6.48 6.41 6.93 7.29                30 5.46 6.53 5.90 5.83 6.04 5.89 6.79   e'     -     -                3 5.67  7.31  6.31  6.26  6.12 6.78 7.29        65 10 5.49 7.02 6.00 6.09 5.91 6.52 7.04                30 5.19 6.27 5.60 5.50 5.55 5.61 6.38     As shown in the table, the interesting features were found in values of  Et  ; the more the number of carbon atom in the alkyl group, the lower the value of  c' for the PEGAE with a given chain length of ethylene oxide, and the  longer the polyethylene oxide chain, the higher the value of  Et for samples with a  definite,  alkyl group.                              )

Physico-chemical Properties of Surface Active Agents. (III) : On the Critical Micelle Concentration in Aqueous Polyoxyothylene Glycol Alkyl Ether Solution

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Physico-chemical Properties of Surface Active Agents. (III) : On the Critical Micelle Concentration in Aqueous Polyoxyothylene Glycol Alkyl Ether Solution

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