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.

scholarly journals Modeling of the Free Radical Copolymerization Kinetics of n-Butyl Acrylate, Methyl Methacrylate and 2-Ethylhexyl Acrylate Using PREDICI®

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 395 ◽  
Author(s):  
Javier A. Gómez-Reguera ◽  
Eduardo Vivaldo-Lima ◽  
Vida A. Gabriel ◽  
Marc A. Dubé
Keyword(s):  
Free Radical ◽  
Methyl Methacrylate ◽  
Butyl Acrylate ◽  
Radical Copolymerization ◽  
Free Radical Copolymerization ◽  
Diffusion Controlled ◽  
Wide Range ◽  
Kinetics Of ◽  
Global Parameters ◽  
Copolymerization Kinetics

Kinetic modeling of the bulk free radical copolymerizations of n-butyl acrylate (BA) and 2-ethylhexyl acrylate (EHA); methyl methacrylate (MMA) and EHA; as well as BA, MMA and EHA was performed using the software PREDICI®. Predicted results of conversion versus time, composition versus conversion, and molecular weight development are compared against experimental data at different feed compositions. Diffusion-controlled effects and backbiting for BA were incorporated into the model as they proved to be significant in these polymerizations. The set of estimated global parameters allows one to assess the performance of these copolymerization systems over a wide range of monomer compositions.

scholarly journals Mathematical modeling of pequi pulp drying and effective diffusivity determination

2017 ◽  
Vol 21 (7) ◽  
pp. 493-498 ◽  
Author(s):  
Elisabete P. de Sousa ◽  
Rossana M. F. de Figueirêdo ◽  
Josivanda P. Gomes ◽  
Alexandre J. de M. Queiroz ◽  
Deise S. de Castro ◽  
...  
Keyword(s):  
Experimental Data ◽  
Effective Diffusivity ◽  
Drying Kinetics ◽  
Convective Drying ◽  
Drying Time ◽  
Air Speed ◽  
Drying Curves ◽  
Increasing Temperature ◽  
Kinetics Of ◽  
Best Fit

ABSTRACT The aim of this work was to study the drying kinetics of pequi pulp by convective drying at different conditions of temperature (50, 60, 70 and 80 °C) and thickness (0.5, 1.0 and 1.5 cm) at the air speed of 1.0 m s-1, with no addition of adjuvant. The experimental data of pequi pulp drying kinetics were used to plot drying curves and fitted to the models: Midilli, Page, Henderson & Pabis and Newton. Effective diffusivity was calculated using the Fick’s diffusion model for a flat plate. It was found that, with increasing thickness, the drying time increased and, with increasing temperature, the drying time was reduced. The Midilli model showed the best fit to the experimental data of pequi pulp drying at all temperatures and thicknesses, presenting higher coefficients of determination (R2), indicating that this model satisfactorily represents the pequi pulp drying phenomenon. There was a trend of increase in the effective diffusivity with the increase in pulp layer thickness and temperature.

Study of Donor Centres in n-InSb due to the Temperature Annealing

2005 ◽  
Vol 480-481 ◽  
pp. 197-200
Author(s):  
Y. Sayad ◽  
A. Nouiri
Keyword(s):  
Experimental Data ◽  
Activation Energy ◽  
Annealing Time ◽  
Annealing Temperature ◽  
Theoretical Study ◽  
Donor Concentration ◽  
Model Based ◽  
Proposed Model ◽  
Kinetics Of ◽  
Best Fit

An increasing of donor centres has been detected in n-InSb when it was submitted to anneal/quench with various annealing temperature (450 °C - 850 °C) and various annealing time (5 - 100 hours). A theoretical study of the kinetics of the conduction conversion of n-InSb at temperature annealing above 250 °C has been made. The present analysis indicates that the donor concentration increases with increasing of annealing time. In order to study this variation and to give a model for donor centres generated, a proposed model based on the simple kinetic is used to fit the variation of donor concentration as a function of annealing time. However, from the best fit of experimental data using the proposed model, the activation energy is determined.

CATIONIC COPOLYMERIZATION OF ISOBUTYLENE WITH ISOPRENE: KINETICS OF THE PROCESS AND DETERMINATION OF KINETIC CONSTANTS

2015 ◽  
Vol 88 (4) ◽  
pp. 574-583 ◽  
Author(s):  
N. V. Ulitin ◽  
K. A. Tereshchenco ◽  
D. A. Shiyan ◽  
G. E. Zaikov
Keyword(s):  
Experimental Data ◽  
Molecular Weight ◽  
Cationic Polymerization ◽  
Methyl Chloride ◽  
Theoretical Description ◽  
Kinetic Constants ◽  
Molecular Weight Characteristics ◽  
Cationic Copolymerization ◽  
Kinetics Of

ABSTRACT A theoretical description has been developed of the kinetics of isobutylene with isoprene (IIR) cationic polymerization in the environment of methyl chloride on aluminum trichloride as the catalyst. Based on experimental data on the kinetics of copolymerization (isobutylene conversion curve) and the molecular weight characteristics of the copolymer of IIR, kinetic constants for the process were found. Adequacy of the developed theoretical description of the kinetics of the IIR copolymerization process was confirmed by comparing the experimental molecular-weight characteristics calculated by this description, independent characteristics, and IIR unsaturation.

Kinetics of Glyphosate Adsorption on Composite Resin from Aqueous Solution

2013 ◽  
Vol 803 ◽  
pp. 157-160
Author(s):  
Zhen Zhen Kong ◽  
Dong Mei Jia ◽  
Su Wen Cui
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Composite Resin ◽  
Order Equation ◽  
Second Order ◽  
First Order ◽  
Basic Resin ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Best Fit

The composite weakly basic resin (D301Fe) was prepared and examined using scanning electron microscopy and Fourier transform infrared spectroscopy. The adsorption kinetics of glyphosate from aqueous solution onto composite weakly basic resin (D301Fe) were investigated under different conditions. The experimental data was analyzed using various adsorption kinetic models like pseudo-first order, the pseudo-second order, the Elovich and the parabolic diffusion models to determine the best-fit equation for the adsorption of glyphosate onto D301Fe. The results show that the pseudo-second order equation fitted the experimental data well and its adsorption was chemisorption-controlled.

scholarly journals Kinetics of Transesterification of Safflower Oil to Obtain Biodiesel Using Heterogeneous Catalysis

2016 ◽  
Vol 14 (4) ◽  
pp. 929-938 ◽  
Author(s):  
Gabriel E. Galván Muciño ◽  
Rubi Romero ◽  
Armando Ramírez ◽  
María Jesús Ramos ◽  
Ramiro Baeza-Jiménez ◽  
...  
Keyword(s):  
Experimental Data ◽  
Statistical Analysis ◽  
Heterogeneous Catalysis ◽  
Kinetic Model ◽  
Methyl Esters ◽  
Molar Ratio ◽  
Safflower Oil ◽  
Estimated Parameters ◽  
Kinetics Of ◽  
Best Fit

Abstract The kinetics of the transesterification of safflower oil and methanol catalyzed by K2O/NaX was studied and modeled. The influence of the oil-methanol initial molar ratio and amount of catalyst were investigated to achieve a maximum triglycerides conversion (99 %) and a final methyl esters content of 94 % ±1. A kinetic model based on an Eley–Rideal mechanism was found to best fit the experimental data when assuming methanol adsorption as determining step. Other models derived from Langmuir – Hinshelwood – Hougen –Watson (LHHW) mechanisms were rejected based on statistical analysis, mechanistic considerations and physicochemical interpretation of the estimated parameters.

Kinetics of Catalytic Dehydration of 1-Pentanol

1993 ◽  
Vol 58 (8) ◽  
pp. 1874-1884 ◽  
Author(s):  
Iveta Vašutová ◽  
Milan Králik ◽  
Milan Hronec
Keyword(s):  
Experimental Data ◽  
Kinetic Data ◽  
Potassium Hydroxide ◽  
Molar Fraction ◽  
Space Velocity ◽  
Continuous Reactor ◽  
Alumina Catalyst ◽  
Direct Formation ◽  
Kinetics Of ◽  
Hydrolysis Of

Kinetic data of 1-pentanol dehydration on γ-alumina catalyst modified by potassium hydroxide were obtained using a continuous reactor with an internal recirculation. The conversion of 1-pentanol on this catalyst in the temperature range 300 - 390 °C and space velocity 1 - 8 kg (h kg)-1 (molar fraction of water in the feed was in the range 0 - 0.56) was 50 - 98% and the selectivity with respect to 1-pentene was 50 - 84%. The following six reactions have been taken into account to describe the catalytic dehydration of 1-pantanol: direct formation of 1-pentene from 1-pentanol, formation of bis(1-pentyl) ether from 1-pentanol, disproportionation of the ether to 1-pentanol and 1-pentene, formation of 1-pentene from the ether, isomerization of 1-pentene to 2-pentene and hydrolysis of the ether to 1-pentanol. Treatment of experimental data by Langmuir-Hinshelwood models showed that the model involving adsorption of 1-pentanol accompanied by dissociation is the most suitable one.

Copolymerization Kinetics of Polyetyhylenglycol Allylether Type Polycarboxylate Superplasticizer

2014 ◽  
Vol 936 ◽  
pp. 1393-1398 ◽  
Author(s):  
Ying Feng Tian ◽  
Xia Ping Zhu ◽  
Ya Ting Deng ◽  
Kui Wang
Keyword(s):  
Ammonium Persulfate ◽  
Radical Copolymerization ◽  
Polymerization Reaction ◽  
Molar Ratio ◽  
Free Radical Copolymerization ◽  
H Nmr ◽  
Polycarboxylate Superplasticizer ◽  
Relationship Of ◽  
Kinetics Of ◽  
Copolymerization Kinetics

The free radical copolymerization kinetics of polyethylenglycol allylether (APEG) with acrylic acid (AA) had been studied in aqueous solution through using ammonium persulfate (APS) and 30% hydrogen peroxide (H2O2) as initiators. The structure of polycarboxylate superplasticizer had been characterized by IR and 1H-NMR. The rate of copolymerization was proportional to the molar ratio of monomers (AA:APEG) to the power of 0.4405, and to the amount of initiator (1.5%APS-2%H2O2, mass ratio to monomers) to the power of 0.7819, respectively. The overall observed activation energy of copolymerization was 45.048 kJ/mol. The kinetic relationship of copolymerization reaction of APEG with AA had been established as follow: Rp∝[APEG/AA]0.4405[APS-30%H2O2]0.7819e-5418/T. The temperature and initiator were main influencing factors on polymerization reaction.

Kinetics of radical copolymerization of vinylidene fluoride with tert-butyl 2-trifluoromethyl acrylate: a suitable pair for the synthesis of alternating fluorinated copolymers

2018 ◽  
Vol 9 (27) ◽  
pp. 3754-3761 ◽  
Author(s):  
Panagiotis G. Falireas ◽  
Mohammad Wehbi ◽  
Ali Alaaeddine ◽  
Bruno Améduri
Keyword(s):  
Vinylidene Fluoride ◽  
Radical Copolymerization ◽  
Tert Butyl ◽  
Fluorinated Copolymers ◽  
Kinetics Of ◽  
Copolymerization Kinetics

A study of the copolymerization kinetics of vinylidene fluoride with tert-butyl 2-trifluoromethyl acrylate: a suitable pair for the synthesis of alternating fluorinated copolymers.

Modeling of the Homogeneous Free‐Radical Copolymerization Kinetics of Fluoromonomers in Carbon Dioxide at Supercritical Conditions

2007 ◽  
Vol 44 (2) ◽  
pp. 205-213 ◽  
Author(s):  
Iraís A. Quintero‐Ortega ◽  
Eduardo Vivaldo‐Lima ◽  
Ram B. Gupta ◽  
Gabriel Luna‐BáRcenas ◽  
Alexander Penlidis
Keyword(s):  
Carbon Dioxide ◽  
Free Radical ◽  
Radical Copolymerization ◽  
Free Radical Copolymerization ◽  
Supercritical Conditions ◽  
Kinetics Of ◽  
Copolymerization Kinetics
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