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![Copolymerization with BMA. Effect of transfer agent concentration [T.A.] on viscosity and conversion (constant initiator concentration [I] 1⁄4 0.6 mon wt % ).](profile/Abdelkader-Bouaziz/publication/233320534/figure/fig4/AS:300023259648002@1448542527178/Copolymerization-with-BMA-Effect-of-transfer-agent-concentration-TA-on-viscosity-and.png)
Copolymerization with BMA. Effect of transfer agent concentration [T.A.] on viscosity and conversion (constant initiator concentration [I] 1⁄4 0.6 mon wt % ).
Source publication
To synthesize an acrylamide-based resin, two functional acrylamide monomers, N-methylolacrylamide and N-butoxymethylolacrylamide, were prepared and copolymerized separately with two methacrylate esters: methylmethacrylate and butylmethacrylate. The resin derived from N-methylolacrylamide proved to be inadequate due to its instability. To adjust the...
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To synthesize an acrylamide-based resin, two functional acrylamide monomers,
N-methylolacrylamide and N-butoxymethylolacrylamide, were prepared and copolymerized
separately with two methacrylate esters: methylmethacrylate and butylmethacrylate.
The resin derived from N-methylolacrylamide proved to be inadequate
due to its instability. To adjust the...
The hybridization of vinylester resin (VER) and organoclay has been studied aiming at enhancing the thermal and mechanical properties of VER. VER prepolymer was synthesized from the reaction of diglycidylether of bisphenol-A and acrylic acid. VER resin-clay nanocomposites were prepared by mixing different ratio of methylmethacrylate (MMA) as a reac...
N-p-Anisylmaleimide (NPAMI) was copolymerized with methylmethacrylate (MMA) to derive copolymaleimide-acrylate poly(NPAMI-MMA). The effect of different free radical initiators: azobisisobutyronitrile (AIBN), benzoyl peroxide and hydrogen peroxide; and of various solvents: p-dioxane (DOX), tetrahydrofuran (THF), cyclohexanone (CHN), dimethylformamid...
Citations
... Organosoluble polymers based on alkyl methacrylates and higher esters or amides of acrylic acid are suggested for use as an additive to refined products, components for paints and varnishes, and other materials [1][2][3]. Homogeneous polymerization in organic solvents is believed to be the routine method for the production of these types of polymers. It was previously demonstrated that alkyl methacrylates are significantly more active than alkyl acrylates in a course of their copolymerization under any conditions [4][5][6][7]. ...
... The compositions of copolymers at each conversion were calculated from the kinetic curves of monomer consumption. At certain intervals the current monomer concentrations were determined by gas chromatography using a Chromos GC-1000 chromatograph; the copolymer composition (m 1 ) and the current conversion were calculated according to the equations (1) and (2). Molecular weights of the copolymers were determined using a Chromos LC-301 gel permeation chromatograph equipped with a refractive index detector (Waters 400) and two columns Phenogel 10E4A and 10E6A (Phenomenex) using tetrahydrofuran as an eluent and polystyrene as a standard. ...
A strong concentration effect was found in a course of copolymerization of higher N-alkylacrylamides with higher alkyl acrylates in toluene, where the fraction of amide functions in copolymers obtained at low degrees of conversion decreases significantly with an increase in total concentration of monomers in solution. It was established that the observed effect is independent of the structure of alkyl substitutes for both types of monomers. The data gathered with the aid of IR spectroscopy and computer modeling show that this concentration effect relates to the formation of amide associates in solution. The concentration effect was absent for the copolymerization of higher alkyl methacrylates and higher alkyl acrylates.
... Organic-soluble polymers based on (meth)acrylic acid esters and acrylamide derivatives are used as additives to petroleum products and in production of paint-andvarnish and other materials [1][2][3]. The most common procedure for producing these polymers is homogeneous polymerization in organic solvents. ...
Copolymerization of higher N-alkylacrylamides of various structures with butyl acrylate and butyl methacrylate in organic solvents was studied.
Degree of hydrogen bonding driven self-association of N-(n-butyl)acrylamide, N-(n-octyl)acrylamide, N-(sec-octyl)acrylamide and N-(tert-octyl)acrylamide in toluene was investigated using IR spectroscopy and computer modeling methods.
Consistent results were demonstrated in the treatment of the Amide-I (νC=O), Amide-II (δN−H and νC−N) and Amide-A (νN−H) absorption bands in IR spectra. Thus, the content of non-bonded (free) amide groups decreases from 83–98% to 8–20% and the content of linear polyassociates increases to 80–90% with an increase in monomer concentration from 0.5 wt% to 50 wt%. The content of cyclic dimers was equal to the value between 5 and 10% regardless of the initial monomer concentration. Dependences of the association degree and the content of the linear polyassociates on the concentration were found to be similar for all of the studied amides.
Amphoteric terpolymers composed of acrylamide, 2-methylacryloylxyethyl trimethyl ammonium chloride, and 2-acrylamido-2-methyl-1-propane sulfonate were prepared via free-radical polymerization in aqueous solution of ammonium sulfate (AS), using poly(2-methylacryloylxyethyl trimethyl ammonium chloride) as stabilizer to yield terpolymers with random distributions. The particle size of the synthesized amphoteric polyacrylamide (AmPAM) ranged from 1 to 8 μm and the intrinsic viscosity ranged from 5.6 to 14.2 dL/g. The influences of aqueous solution of AS concentration, stabilizer concentration, initiator concentration, monomer concentration on the conversion of monomer, the intrinsic viscosity, and the particle size were systematically investigated. The characteristic of amphoteric polymer was also be studied. Throughout the study, we found that the isoelectric point of the amphoteric polyelectrolyte we synthesized is about 7. With the increase in sodium chloride, the reduced viscosity of AmPAM increased. Among the different type of inorganic salt, the degree of influence of anionic is I > Br > Cl.
