Radical copolymerization on fluoroalkyl α-chloroacrylate monomers for copolymer composition control

2021 ◽  
Author(s):  
Ikuo Yamamoto ◽  
Shinichi Minami ◽  
Tsuyoshi Ando ◽  
Hiroharu Ajiro
Keyword(s):  
Radical Copolymerization ◽  
Copolymer Composition ◽  
Composition Control

scholarly journals Solvent Effects on Radical Copolymerization Kinetics of 2-Hydroxyethyl Methacrylate and Butyl Methacrylate

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 487 ◽  
Author(s):  
Loretta Idowu ◽  
Robin Hutchinson
Keyword(s):  
Monomer Concentration ◽  
Propagation Rate ◽  
Radical Copolymerization ◽  
Size Exclusion ◽  
Butyl Methacrylate ◽  
Copolymer Composition ◽  
Solvent Mixtures ◽  
Hydroxyethyl Methacrylate ◽  
Kinetic Coefficients ◽  
Exclusion Chromatography

2-Hydroxyethyl methacrylate (HEMA) is an important component of many acrylic resins used in coatings formulations, as the functionality ensures that the chains participate in the cross-linking reactions required to form the final product. Hence, the knowledge of their radical copolymerization kinetic coefficients is vital for both process and recipe improvements. The pulsed laser polymerization (PLP) technique is paired with size exclusion chromatography (SEC) and nuclear magnetic resonance (NMR) to provide kinetic coefficients for the copolymerization of HEMA with butyl methacrylate (BMA) in various solvents. The choice of solvent has a significant impact on both copolymer composition and on the composition-averaged propagation rate coefficient (kp,cop). Compared to the bulk system, both n-butanol and dimethylformamide reduce the relative reactivity of HEMA during copolymerization, while xylene as a solvent enhances HEMA reactivity. The magnitude of the solvent effect varies with monomer concentration, as shown by a systematic study of monomer/solvent mixtures containing 50 vol%, 20 vol%, and 10 vol% monomer. The observed behavior is related to the influence of hydrogen bonding on monomer reactivity, with the experimental results fit using the terminal model of radical copolymerization to provide estimates of reactivity ratios and kp,HEMA.

scholarly journals New Thermo-Sensitive Hydrogel Based on Copolymer of 2-hydroxyethyl Acrylate and Ethyl Acrylate

2017 ◽  
Vol 19 (1) ◽  
pp. 47
Author(s):  
R.K. Rakhmetullayeva ◽  
A.N. Azhkeyeva ◽  
G.Zh. Yeligbayeva ◽  
Ye.M. Shaikhutdynov ◽  
G.A. Mun ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Crosslinking Agent ◽  
Three Dimensional ◽  
Ethyl Acrylate ◽  
Radical Copolymerization ◽  
Water Soluble ◽  
Copolymer Composition ◽  
Polymer Hydrogels ◽  
Hydrophobic Moiety ◽  
Sensitive Behavior

In this work firstly the thermo-sensitive polymer hydrogels were obtained by three-dimensional radical copolymerization of water-soluble HEA and hydrophobic monomer ethyl acrylate (EA) in the presence of crosslinking agent N,N’-methylenebisacrylamide (BAA). The hydrogels with certain copolymer compositions showed thermo-sensitive behavior in aqueous solutions. The regularity of complex formation of cross-linked copolymer HEA-EA with anionic and cationic surface-active substances have been studied. The swelling behavior of the hydrogels in cetylpyridinium bromide aqueous solutions was studied. Increased swelling of the hydrogels was observed in the surfactant solutions. The increased swelling was more prominent for the hydrogels with a higher content of the hydrophobic moiety in the copolymer composition and with the higher surfactant concentration. The reason for the observed phenomenon is discussed.

Kinetics of the radical copolymerization of styrene and 2-methoxyethyl methacrylate

1983 ◽  
Vol 48 (9) ◽  
pp. 2656-2665 ◽  
Author(s):  
Jaroslav Stejskal ◽  
Dagmar Straková ◽  
Ondřej Procházka ◽  
Pavel Kratochvíl
Keyword(s):  
Experimental Data ◽  
Molecular Weight ◽  
Kinetic Data ◽  
Radical Copolymerization ◽  
Copolymer Composition ◽  
Monomer Mixture ◽  
Diffusion Controlled ◽  
Kinetics Of ◽  
Best Fit ◽  
Copolymerization Kinetics

Twenty low-conversion statistical copolymers of styrene and 2-methoxyethyl methacrylate with various composition were prepared. The dependence of the copolymer composition, molecular weight, initiation efficiency and other parameters on the composition of the monomer mixture is discussed. Kinetic data are correlated by means of various models of the copolymerization kinetics. The best fit with experimental data is provided by a diffusion-controlled termination model, especially its dyad variant suggested in this study.

Terpolymerization of Methacrylonitrile, Styrene, and α-Methylstyrene

1972 ◽  
Vol 50 (11) ◽  
pp. 1757-1766 ◽  
Author(s):  
Alfred Rudin ◽  
Schumann S. M. Chiang ◽  
H. Kirk Johnston ◽  
Paul D. Paulin
Keyword(s):  
Free Radical ◽  
Simple Model ◽  
Radical Copolymerization ◽  
Polymer Composition ◽  
Copolymer Composition ◽  
Reactivity Ratios ◽  
Free Radical Copolymerization ◽  
Feed Composition ◽  
Chromatographic Techniques ◽  
Ceiling Temperature

The free radical copolymerization of methacrylonitrile, styrene, and α-methylstyrene was studied at 60 °C in toluene solution. Copolymer composition was calculated from the composition of the unreacted monomers, as measured by g.l.c. Reactivity ratios measured previously for the three monomer pairs involved were used with the simple terpolymerization equation to predict polymer composition. Agreement between predicted and experimental polymer compositions was satisfactory. The behavior of α-methylstyrene can be described by a simple model without reference to ceiling temperature or penultimate effects because sequence lengths of this monomer in the terpolymers are short.A true azeotropic feed composition was not investigated, but several monomer mixtures produced copolymers with compositions which varied so little from that of the feed that the systems could be considered to be azeotropic for practical synthetic purposes. This behavior is in accord with expectations.Analytical accuracy of the gas chromatographic techniques was examined and means are suggested to make the best use of this method in copolymerization studies.

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