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Methacryloyl Chloride (methacryloyl + chloride)
Selected AbstractsSynthesis and characterization of poly(ethylene oxide- co -ethylene carbonate) macromonomers and their use in the preparation of crosslinked polymer electrolytesJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 7 2006Anette Munch Elmér Abstract Methacrylate-functionalized poly(ethylene oxide- co -ethylene carbonate) macromonomers were prepared in two steps by the anionic ring-opening polymerization of ethylene carbonate at 180 °C, with potassium methoxide as the initiator, followed by the reaction of the terminal hydroxyl groups of the polymers with methacryloyl chloride. The molecular weight of the polymer went through a maximum after approximately 45 min of polymerization, and the content of ethylene carbonate units in the polymer decreased with the reaction time. A polymer having a number-average molecular weight of 2650 g mol,1 and an ethylene carbonate content of 28 mol % was selected and used to prepare a macromonomer, which was subsequently polymerized by UV irradiation in the presence of different concentrations of lithium bis(trifluoromethanesulfonyl)imide salt. The resulting self-supportive crosslinked polymer electrolyte membranes reached ionic conductivities of 6.3 × 10,6 S cm,1 at 20 °C. The coordination of the lithium ions by both the ether and carbonate oxygens in the polymer structure was indicated by Fourier transform infrared spectroscopy. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 2195,2205, 2006 [source] Preparation of novel macromonomers and study of their polymerizationJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 15 2004Guohua Deng Abstract Novel macromonomers of polystyrene and poly(tert -butyl acrylate) containing a methacryloyl group as a polymerizable unit and two chains of the same length were prepared in two steps: the synthesis of the precursors through the atom transfer radical polymerization of styrene and tert -butyl acrylate initiated by 1-hydroxymethyl-1,1-di[(2-bromoisobutyryloxy)methyl] ethane and the esterification of the hydroxyl group in the precursors with methacryloyl chloride. The molecular weight and polydispersity of the macromonomers were controllable because of the living nature of the atom transfer radical polymerization. Gel permeation chromatography, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, and hydrolysis confirmed the structure of the novel macromonomers. The homopolymerization and copolymerization of the macromonomers were investigated to prepare branched copolymers in which two chains were grafted from every repeating unit. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 3887,3896, 2004 [source] Polymacromonomers with polyolefin branches synthesized by free-radical homopolymerization of polyolefin macromonomer with a methacryloyl end groupMACROMOLECULAR SYMPOSIA, Issue 1 2004Hideyuki Kaneko Abstract Polymacromonomers with polyolefin branches were successfully synthesized by free-radical homopolymerization of polyolefin macromonomer with a methacryloyl end group. Propylene-ethylene random copolymer (PER) with a vinylidene end group was prepared by polymerization using a metallocene catalyst. Then, the unsaturated end group was converted to a hydroxy end group via hydroalumination and oxidation. The PER with the hydroxy end group was easily reacted with methacryloyl chloride to produce methacryloyl-terminated PER (PER macromonomer; PERM). The free-radical polymerization of thus-obtained PERM was done using 2,2,-azobis(isobutyronitorile) (AIBN) as a free-radical initiator. From NMR analyses, the obtained polymers were identified as poly(PERM). Based on gel permeation chromatography (GPC), the estimated degree of polymerization (Dp) of these polymers were about 30. Thus, new class of polymacromonomers with polyolefin branches was synthesized. [source] Synthesis of graft and block copolymers from 2-dimethylaminoethyl methacrylate and caprolactonePOLYMER INTERNATIONAL, Issue 8 2007Shaheen Motala-Timol Abstract This paper outlines the synthesis of a range of graft and block copolymers containing 2-dimethylaminoethyl methacrylate and caprolactone sequences by means of two distinct strategies. In the first place, common to both pathways, low-molar-mass hydroxyl end-capped polycaprolactone (PCL-OH) was prepared by the ring-opening polymerization of caprolactone in the presence of an aluminium alkoxide Schiff's base (HAPENAlOiPr) as initiator followed by hydrolysis of the AlO bond. For the synthesis of copolymers with a main vinyl carbon,carbon backbone and PCL grafts, PCL-OH was initially converted into ,-methacryl-PCL using methacryloyl chloride. This macromonomer was then copolymerized with 2-dimethylaminoethyl methacrylate (DMAEMA) by atom transfer radical polymerization (ATRP). For the synthesis of block copolymers, PCL-OH was first transformed into a bromine end-capped PCL (PCL-Br) with 2-bromoisobutyryl bromide. PCL-Br was then used as macroinitiator in various concentrations for the ATRP of 2-dimethylaminoethyl methacrylate, thus leading to PCL and poly(DMAEMA) blocks of varying lengths. The formation of both graft and block copolymers was thoroughly checked using NMR and size exclusion chromatography. Copyright © 2007 Society of Chemical Industry [source] Temperature and pH sensitive ionic hydrogels based on new crosslinkersPOLYMERS FOR ADVANCED TECHNOLOGIES, Issue 6 2005Ayman M. Atta Abstract New crosslinkers were synthesized from reaction of melamine with acryloyl and methacryloyl chloride in the presence of 1-methyl-2-pyrrolidone as a solvent and triethyl amine as acid acceptor. The chemical structures of the prepared crosslinkers were elucidated from FT-IR, 1H-NMR and 13C-NMR analyses. Linear 2-acrylamido-2-methyl-1-propane sulfonic acid and methacrylic acid (AMPS/MAA) copolymers were prepared and their viscometric properties in aqueous solution were investigated. Different weight percentages of the prepared crosslinkers were used as crosslinking agent (AMPS/MAA) to prepare ionic copolymers using ammonium persulfate as initiator. The percentage of crosslinkers was varied from 0.5 to 4,wt%. The swelling behaviors of crosslinked AMPS/MAA gels in deionized water were measured at different pH and temperatures. All AMPS/MAA copolymers exhibit faster deswelling rate at 50°C except for the copolymer containing 0.9 (mol ratio) AMPS. Copyright © 2005 John Wiley & Sons, Ltd. [source] | ||||||||||