Radical copolymerization of acrylic acid and OEGMA475: Monomer reactivity ratios and structural parameters of the copolymer (original) (raw)
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Synthesis and characterization of hydrophilic copolymers
International Journal of Biology, 2012
Two composition ratios of poly[N-isopropylacrylamide (NIPAAm)-co-2-hedroxy ethyl acrylate (2-HEA)] were prepared in ethanol/water mixtures (v/v, 1/1) using ammonium persulfate (APS) as initiator. The hydrophilic copolymers were characterized by DSC, TGA, GPC and SEM. The results showed that molecular weight, Tg, thermal stability increase with increase of NIPAAm in the copolymers. The increase of molecular weight is interpreted in terms of increasing the formation of primary radicals in high ratio of NIPAAm in the copolymer. SEM showed that the polymer became more hydrophilic with increasing the ratio of NIPAAm in the copolymer.
Sequence Determination in Acrylic Acid-Methyl Methacrylate Copolymers by 13C and 1H NMR Spectroscopy
Polymer Journal, 1989
Acrylic acid(AA)-methyl methacrylate(MMA) copolymers of varying compositions were prepared in bulk using benzoyl peroxide as an initiator. 13 C and 1 H NMR spectra of the copolymers were recorded and analyzed. From the observed copolymer composition provided by 1 H NMR, reactivity ratios were determined. The compositional triad sequences were determined by using carbonyl and IX-methyl resonances. The experimentally determined triad concentrations showed good agreement with theoretical distribution, calculated using Bernoullian statistics and Harwood's program, as the copolymers were random in nature.
Reactive and Functional Polymers, 2005
Methacrylate based monomer 2,4-dichlorophenyl methacrylate (2,4-DMA) was synthesized by reacting 2,4-dichlorophenol (2,4-DP) with methacryloyl chloride in ethanol. The free radical initiated copolymerization of 2,4DMA with methyl acrylate (MA) was carried out in toluene solution at 70°C using 2,2 0-azobisisobutyronitrile (AIBN) as an initiator with different monomer feed ratios. The monomer 2,4DMA was characterized by FT-IR and 1 H NMR spectral studies. The copolymers were characterized by IR-spectroscopy. The copolymer composition obtained by UV-spectra led to the determination of reactivity ratios employing Fineman-Ross and Kelen-Tudos linearization methods. The solubility of the polymers was tested in various polar and non-polar solvents. Gel permeation chromatography was employed to determine the molecular weights (M w and M n) and polydispersity index of polymers. Thermogravimetric analysis of the polymers reveals that the thermal stability of the copolymers increases with increase in the mole fraction of 2,4-DMA in the copolymers. The prepared homo and copolymers were tested for their antimicrobial activity against bacteria, fungi and yeast.
Macromolecules, 2001
1 H and 13 C NMR spectra of copolymers of methyl methacrylate (M) and butyl acrylate (B) were analyzed in terms of sequence distribution and stereoregularity of monomer units. The copolymers were prepared by atom transfer radical polymerization (ATRP) in bulk and 25% (v/v) benzonitrile solution. The different experimental conditions resulted in different levels of polymerization control. Under our experimental conditions, the experimental data agreed well with data calculated from the Mayo-Lewis terminal model and Bernoullian statistics with monomer reactivity ratios of rM ) 1.44 ( 0.11 and rB ) 0.56 ( 0.06 and an isotacticity parameter of σM ) 0.23 and coisotacticity parameter of σ ) 0.30. Therefore, the copolymer compositions and microstructures are independent of the controllability of the ATRP process.
Sequence-length distribution in bulk and DMSO-derived acrylic acid/methylmethacrylate copolymers
Journal of polymer science, 1985
The mean sequence lengths (1) and probabilities (W) in the formation of various structural units were estimated for acrylic acid (AA) and methylmethacrylate (MMA) copolymers obtained in bulk and solution (DMSO) copolymerization. The results show that, although 11:12 in bulk polymerization ranges from about 1:5 to about 5:l when moving from lower to higher M, feeds in DMSO polymerization, the corresponding range is 1:25 to about 1 2 , all in favor of the monomer M,. The probability of the formation of structural units of a kind (e.g., doublets and triplets) that in bulk polymerization favors M , more than Mz swings drastically in favor of Mz when the polymerization is carried out in DMSO. .
Observations on some copolymerisations involving N -isopropylacrylamide
Polymer, 2000
Free radical copolymerisations of N-isopropylacrylamide (NIPA) with acrylic acid (AA), methacrylic acid (MAA) and 2-methyl-2acrylamidopropane sulphonic acid (AMPS) have been conducted over a range of conversions in ethanol, ethanol and water respectively. It was necessary to devise special methods for isolating the copolymers, since the common device of precipitation into a non-solvent could not be adopted here. Experimental procedures necessary to overcome rapid attainment of high conversion, crosslinking and irreproducibility for the systems containing AA and MAA as comonomers are discussed. For all three systems compositions of linear copolymers were determined by conductometric titration vs. aq. NaOH. The monomer reactivity ratios (r) were calculated from the initial monomer feed composition, the fractional conversion and the copolymer composition, by means of the extended Kelen-Tüdős method. The 95% confidence ellipses were also computed. The results are: r 1 14:0^1:9 and r 2 0:07^0:09 for NIPA(1)/AA(2), r 1 10:2^1:4 and r 2 0:010 :03 for NIPA(1)/MAA(2) and r 1 2:4^0:8 and r 2 0:03^0:02 for NIPA(1)/AMPS(2). Hence none of these systems undergoes azeotropic copolymerisation. The extent of compositional heterogeneity has been demonstrated by computed curves of instantaneous copolymer composition at different stages of conversion. Examination of the rather limited literature on linear copolymerisations involving NIPA discloses possible flaws and uncertainties in some of the procedures employed.
Reactivity ratio of novel acrylic copolymer by NMR spectroscopy
Colloid and Polymer Science, 2009
The monomer 4-methylcoumarylacrylate (4-MCA) was synthesized from 7-hydroxy-4-methylcoumarin and characterized by conventional methods. Homo and copolymers of 4-methylcoumarylacrylate and styrene were synthesized with different feed ratios using N,N-dimethylformamide (DMF) as a solvent and 2,2′-azobisisobutyronitrile as an initiator at 70°C.The resulting polymers were characterized by infrared spectroscopy. Copolymer compositions were determined by nuclear magnetic resonance spectroscopy. The monomer reactivity ratios were determined by applying the conventional linearization method of Fineman-Ross and Kelen-Tudos. The reactivity ratios values of 4-methylcoumarylacrylate and styrene obtained from F-R plot are 1.36 and 0.62, respectively, and from K-T plot 1.24 and 0.58, respectively.