- Photopolymerization of Poly(ethylene glycol) dimethacrylates: The influence of ionic liquids on the formulation and the properties of the resultant polymer materials
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The photo-initiated polymerization of poly(ethylene glycol)dimethacrylates [PEGDM(n)] in the presence of various ionic liquids (ILs) is reported. The influence of ILs concentrations as well as of their nature upon the photopolymerization kinetics was studied in detail. It was found that according to reactive ability in bulk and in solution photopolymerization, the investigated monomers can be divided into two groups: PEGDM(1)-PEGDM(2)-PEGDM(3) and PEGDM(4)-PEGDM(7-8). ILs slightly influence the photopolymerization of monomers from the first group and greatly change kinetics of those from the second. Such behavior was explained by the theory of "kinetically favorable or unfavorable monomer associations." It was demonstrated that certain ILs accelerate the photopolymerization of the highest PEGDMs and offer access to the polymers derived from low reactive monomers. Relying on the obtained data, the attempt to predict the structu re of the "best" ionic additive for the given monomer photopolymerization was performed and proved. Finally, the influence of both residual and specially added ILs quantities upon the properties of obtained polymer materials was investigated. It was revealed that ILs can physically interact with polymer networks increasing their thermal stability, plasticizing films, and blocks, imparting ionic conductivity equal up to 3.62 × 10 -3 Sm/cm at 25 °C.
- Chesnokov, Sergey A.,Zakharina, Marya Yu.,Shaplov, Alexander S.,Lozinskaya, Elena I.,Malyshkina, Inna A.,Abakumov, Gleb A.,Vidal, Frederic,Vygodskii, Yakov S.
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- Method for catalytically synthesizing diethylene glycol di(methyl) acrylate by calcium glyceroxide
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The invention discloses a method for catalytically synthesizing diethylene glycol di(methyl) acrylate by calcium glyceroxide, and belongs to the field of fine chemical engineering. (Methyl) alkyl acrylate and diethylene glycol are used as raw materials; a reaction-rectification coupling process is adopted; a copper-wire-net-filled modified rectification column is used; the catalyst calcium glyceroxide is added; enough product purity and yield can be obtained after a simple aftertreatment process. The method overcomes multiple disadvantages of an existing transesterification catalyst, and is high in yield and simple in post-processing. Compared with a conventional transesterification method, the method provided by the invention can improve the total yield and the processing capacity; energy needed for separation is supplied by utilizing reaction heat, so that the energy consumption is decreased, and an investment is reduced. The method provided by the invention is simple and short in process flow; the raw materials are easily obtained; equipment is simple; reaction conditions are easy to control. The method is mild in the reaction conditions and simple in purification and refining processes; a product is stable, is easy to separate, and is not liable to generate a polymerization phenomenon.
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Paragraph 0039; 0040
(2017/01/02)
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- Copper(II) triflate as a source of triflic acid: effective, green catalysis of hydroalkoxylation reactions
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The hydroalkoxylation of dicyclopentadiene (DCPD) and norbornene (NB) with 2-hydroxyethyl methacrylate (HEMA) for the synthesis of industrially relevant monomers has been investigated with various metal-based Lewis acids and strong Bronsted acids. In the
- Tschan, Mathieu J.-L.,Thomas, Christophe M.,Strub, Henri,Carpentier, Jean-Francois
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experimental part
p. 2496 - 2504
(2010/04/03)
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- COMPOSITION FOR POLYELECTROLYTES, POLYELECTROLYTES, ELECTRICAL DOUBLE LAYER CAPACITORS AND NONAQUEOUS ELECTROLYTE SECONDARY CELLS
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A polymer electrolyte-forming composition containing (A) a quaternary ammonium salt of general formula (1) below and (B) an ionic liquid can be converted into a polymer without compromising the excellent properties of the ionic liquid, thus enabling an electrolyte having an excellent safety and electrical conductivity and also a broad potential window to be obtained. In formula (1), R1 to R3 are each independently an alkyl group of 1 to 5 carbons or a substituent having a reactive unsaturated bond and any two from among R1 to R3 may together form a ring, and R4 is methyl, ethyl or a substituent having a reactive unsaturated bond, with the proviso that at least one of R1 to R4 is a substituent having a reactive unsaturated bond. X is a monovalent anion, the letter m is an integer from 1 to 8, and the letter n is an integer from 1 to 4.
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- Synthesis of water-soluble polymethacrylates by living anionic polymerization of trialkylsilyl-protected oligo(ethylene glycol) methacrylates
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2-[2-[(tert-Butyldimethylsilyl)oxy]ethoxy]ethyl methacrylate (2) and 2-[2-[2-[(tert-butyldimethylsilyl)oxy] ethoxy] ethoxy] ethyl methacrylate (3) were polymerized anionically in THF at -78 °C for 2-24 h. The anionic initiator systems included 1,1-diphenyl-3-methylpentyllithium/lithium chloride and diphenylmethylpotassium/diethylzinc. The polymerization of novel tert-butyldimethylsilyl-protected oligo(ethylene glycol) methacrylates, 2 and 3, proceeded quantitatively in each case. The resulting polymers possessed the predicted molecular weights based on the molar ratios of monomers to initiators, and narrow molecular weight distributions (Mw/Mn 1.1). The stability of the propagating carbanion of poly(2) and poly(3) was ascertained by the quantitative efficiencies of the sequential block copolymerizations using tert-butyl methacrylate (tBMA). Well-defined block copolymers, poly(2)-block-poly(tBMA) and poly(3)block-poly(tBMA), were obtained. The trialkylsilyl protecting groups of poly(2) and poly(3) were quantitatively hydrolyzed using 2 N HC1 in aqueous THF at 0 °C for 2 h to give tailored poly[di(ethylene glycol) methacrylate] and poly[tri(ethylene glycol) methacrylate], respectively. Both polymethacrylates obtained after deprotection were readily soluble in water due to the high polarity of the hydrophilic oligo(ethylene glycol) pendant units with terminal OH functionality.
- Ishizone, Takashi,Han, Seok,Okuyama, Syunsuke,Nakahama, Seiichi
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