Results 1 to 10 of about 1,294 (152)
Base-catalyzed Polymerization of Cyclic Dimethylpolysiloxanes
The Journal of the Society of Chemical Industry, Japan, 1963 環状ジメチルポリシロキサンの開環重合触媒として, 水酸化セシウム, カセイカリなどの強塩基性アルカリ金属水酸化物を使用した場合は, 触媒を完全に取り除くかまたは不活性化しないと高温度で重合体が解重合をひき起す。著者らは, 強塩基性を示すが高温度では不活性な物質に分解する水酸化テトラアルキルアルソニウム化合物[(n-C4H9)4・AsOH],水酸化テトラアルキルスチボニウム化合物[(n-C4H9)4SbOH],[(CH3)4SbOH] , 水酸化トリアルキルスルホニウム化合物[(CH3)3SOH],[(C2H5)3SOH]グアニジン[HN=C(NH2)2],およびアミジン〓などについて環状ジメチルポリシロキサンの開環重合を検討して,[(n-C4H9)4AsOH ...
Kazuhisa Kawazumi +2 more
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Revista do Colégio Brasileiro de Cirurgiões, 2021 Objectives: the aim of this study was to compare the outcomes of a new silicone vascular prostheses with PTFE vascular prostheses, on a rabbit experimental model.
FERNANDA APPOLONIO ROCHA +3 more
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Effectiveness of dimethylpolysiloxane during deep frying
European Journal of Lipid Science and Technology, 2004 AbstractIn the last decades, silicones and particularly dimethylpolysiloxane (DMPS) added to oils and fats at very low concentrations (1–5 mg/kg) have been widely applied as inhibitors of thermoxidative reactions in deep frying. In this review, information available on the mechanisms of DMPS action during the frying process is summarised.
Márquez Ruiz, Gloria +2 more
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Accuracy of Different Interocclusal Recording Methods
Advanced Medical JournalBackground: In order to fabricate successful prostheses, it is necessary to reproduce the interocclusal relationship accurately and transfer it to the articulator.
Hassan Ahmed Alwan +2 more
doaj +1 more source
Supercritical Fluid Chromatographic Separation of Dimethylpolysiloxane Polymer [PDF]
Bulletin of the Korean Chemical Society, 2005 The use of compressed (dense) gases and supercritical fluids as chromatographic mobile phases in conjunction with liquid chromatographic (LC)-type packed columns was first reported by Klesper et al. in 1962. During its relatively short history, supercritical fluid chromatography (SFC) has become an attractive alternative to GC and LC in certain ...
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Determination of Dimethylpolysiloxane in Instant Coffee
Journal of AOAC INTERNATIONAL, 1977 Abstract A method is described for determining dimethylpolysiloxane in instant coffee. The siloxane is extracted with chloroform in a Soxhlet apparatus and then converted to silica which is estimated by a heteropoly blue method. The method is interference-free, and 5 μg dimethylpolysiloxane can be easily detected.
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Analysis of Dimethylpolysiloxane in Tofu by FTIR
Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi), 1997 A simple and rapid determination method was developed for dimethylpolysiloxane (DMPS) in Tofu by FTIR. DMPS was extracted from Tofu with diethyl ether. The extract was cleaned up with a charcoal-alumina-celite column.The eluate was evaporated, and the residue was dissolved in 1mL of n-hexane.
Chie HIDAKA +2 more
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Dimethylpolysiloxane in the preparation of adult excretory urography
Medical Journal of Indonesia, 1992 [no abstract available]
Olivia Kuswanto +4 more
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Determination of Dimethylpolysiloxane in Foods by Atomic Absorption Spectrophotometry
Food Hygiene and Safety Science (Shokuhin Eiseigaku Zasshi), 1975 The determination of dimethylpolysiloxane (DMPS) in foods by atomic absorption spectrophotometry was studied. The separation of DMPS from the edible oil was carried out as follows: The sample mixed with DEAE cellulose powder placed on a DEAE cellulose column kept at -70°C, then n-hexane was poured into the column. The solvent of the eluate was removed,
Motohiro NISHIJIMA +5 more
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Syntheses and Properties of Surface Active Agents Containing Dimethylpolysiloxane
The Journal of the Society of Chemical Industry, Japan, 1967 分子内の主鎖部にケイ素を含む活性剤が最近広く研究されているが,一連のジメチルポリシロキサンを含むカチオン活性剤はまだ研究されていない。著者らは次のようにしてシロキサン結合鎖数が5までのものを合成した。ジメチルジクロルシランとトリメチルクロルシランの加水分解で直鎖ジメチルポリシロキサンを得た。このメチル基の1個の水素を塩素置換して後モルホリンまたはジエチルアミンと処理し,塩酸で中和するとジメチルポリシロキサンを含むアミン塩酸塩が得られた。生成物の物性を若干検討した結果,表面張力とシリコン油に対する界面張力は異性体混合物を含むジメチルポリシロキサンジエチルアミン塩酸塩では良い結果が得られた。ケロシンのような普通の油に対する界面張力は市販のものより劣る。
Hirohisa MAKI +2 more
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