Green Polymerization of Hexadecamethylcyclooctasiloxane Using an Algerian Proton Exchanged Clay Called Maghnite-H+
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منابع مشابه
Polycondensation of Tetrahydrofuran with Phthalic Anhydride Induced By a Proton Exchanged Montmorillonite Clay
“Maghnite” a montmorillonite sheet silicate clay, exchanged with protons to produce “H-Maghnite” is an efficient catalyst for polymerization of many vinylic and heterocyclic monomers (Belbachir, M. U.S. Patent. 066969.0101 –2001). The structure compositions of both “Maghnite” and “H-Maghnite” have been developed. This catalyst was used for the polycondensation of the tetrahydrofuran with phthal...
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The main emphasis in developing DOS has been on achieving low crosstalk (CT). CT in the order of -30 dB is acceptable in conventional DOS and below that value is hard to achieve. Relatively low drive voltage (or power requirements) is also necessary to optimized DOS. This paper depicts the design of Y-branched digital optical switches (DOS) with optimized on-chip area coverage, reduced driving ...
متن کاملPreparation of poly(oxybutyleneoxymaleoyl) catalyzed by a proton exchanged montmorillonite clay.
The polycondensation of tetrahydrofuran with maleic anhydride catalyzed by Maghnite-H+ (Mag-H) was investigated. Maghnite is a montmorillonite sheet silicate clay that is exchanged with protons to produce Maghnite-H [1]. It was found that the polymerization in bulk is initiated by Mag-H in the presence of acetic anhydride at 40 degrees C. The effects of the amounts of Mag-H and acetic anhydride...
متن کاملPlasma etching of proton-exchanged lithium niobate
Plasma etching of lithium niobate with fluorine gases is limited by the redeposition LiF. This results in a low etch rate and nonvertically etched walls. Etching of proton-exchanged lithium niobate can prevent the LiF deposition to a large extent because of the greatly reduced lithium concentration in lithium niobate. We performed different inductively coupled plasma etching processes using SF6...
متن کاملStress in LiNbO3 proton-exchanged waveguide layers
Penetration of hydrogen ions in the crystal lattice of LiNbO3 certainly causes stress in the proton-exchanged region, especially when the level of doping is high. In the present study, a correlation between stress and the level of doping (respectively, between stress and the phase composition of the measured layer) has been obtained. Proton-exchanged waveguide layers in X, Y and Z-cut LiNbO3 ha...
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ژورنال
عنوان ژورنال: Bulletin of Chemical Reaction Engineering & Catalysis
سال: 2018
ISSN: 1978-2993
DOI: 10.9767/bcrec.13.1.993.36-46