非イオン界面活性剤の性質に及ぼす構造効果 (第9報) : ビス (7, 7-ジメチル-2-オキサ-7-シラオクチル) メチル=ポリ (オキシエチレン) モノエーテルの合成と界面化学的性質

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Bis (7, 7-dimethyl-2-oxa-7-silaoctyl) methanol was prepared from epichlorohydrin and 5, 5-dimethyl-5-silahexanol. The polyaddition of ethylene oxide (EO) to the obtained carbinol in the presence of base gave a series of new type nonionics having two hydrocarbon chains terminated with trimethylsilyl groups; [(CH3) 3Si (CH2) 4OCH2] 2CHO (C2H4O) mH (SiGDE-series). Some properties were compared with those of α, α-glyceryl dioctyl ether-EO adducts; [CH3 (CH2) 7OCH2] 2CHO (C2H4O) mH (GDE-series) and n-hexadecanol-EO adducts; CH3 (CH2) 15O (C2H4O) mH (S-series). At the same m, cloud points of SiGDE-series were lower than those of GDE-series. Surface tension lowering abilities of SiGDE-series in aqueous and polyoxyethylene glycol were higher than those of GDE-series. SiGDE-series remarkably lowered interfacial tensions of kerosene and silicone oil-water system. Foaming, wetting and emulsifying powers of SiGDE-series were superioer to those of GDE- and S-series. These results were discussed from viewpoint of the application to industries.