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.

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

Controlled Free‐Radical Copolymerization Kinetics of Styrene and Divinylbenzene by Bimolecular NMRP using TEMPO and Dibenzoyl Peroxide

2006 ◽  
Vol 43 (7) ◽  
pp. 995-1011 ◽  
Author(s):  
Ellen Tuinman ◽  
Neil T. McManus ◽  
Martha Roa‐Luna ◽  
Eduardo Vivaldo‐Lima † ◽  
Liliane M. F. Lona ◽  
...  
Keyword(s):  
Free Radical ◽  
Radical Copolymerization ◽  
Free Radical Copolymerization ◽  
Kinetics Of ◽  
Copolymerization Kinetics ◽  
Dibenzoyl Peroxide

Free-radical copolymerization kinetics of acrylonitrile and methyl acrylate in [BMIM]BF4

2006 ◽  
Vol 102 (5) ◽  
pp. 4254-4257 ◽  
Author(s):  
Da Li ◽  
Yumei Zhang ◽  
Huaping Wang ◽  
Jianzhong Tang ◽  
Biao Wang
Keyword(s):  
Free Radical ◽  
Methyl Acrylate ◽  
Radical Copolymerization ◽  
Free Radical Copolymerization ◽  
Kinetics Of ◽  
Copolymerization Kinetics

Free Radical Copolymerization Kinetics of γ-Methyl-α-methylene-γ-butyrolactone (MeMBL)

2011 ◽  
Vol 12 (6) ◽  
pp. 2319-2326 ◽  
Author(s):  
Robert A. Cockburn ◽  
Rebekka Siegmann ◽  
Kevin A. Payne ◽  
Sabine Beuermann ◽  
Timothy F. L. McKenna ◽  
...  
Keyword(s):  
Free Radical ◽  
Radical Copolymerization ◽  
Free Radical Copolymerization ◽  
Kinetics Of ◽  
Copolymerization Kinetics

Synthesis of Polycarboxylate Superplasticizer with β-Cyclodextrins as Side Chain

2012 ◽  
Vol 455-456 ◽  
pp. 606-611
Author(s):  
Sheng Hua Lv ◽  
Rui Jun Gao ◽  
Di Li
Keyword(s):  
Maleic Anhydride ◽  
Ammonium Persulfate ◽  
Radical Copolymerization ◽  
Molar Ratio ◽  
Side Chain ◽  
Vinyl Monomers ◽  
Feeding Mode ◽  
Molar Ratios ◽  
Polycarboxylate Superplasticizer ◽  
Effect Of Feeding

A new polycarboxylate superplasticizer (NPC) was synthesized by radical copolymerization of maleic anhydride (MAH), sodium methylacryl sulfonate (MAS), allyl polyethylene glycols (APEG), and β-cyclodextrins grafted maleic anhydride (MAH-β-CD) using ammonium persulfate (APS) as initiator. The effect of feeding mode and molar ratio of monomers, contents of MAH-β-CD and reaction temperature on fluidity was discussed. The results show that the excellent properties of NPC were obtained when molar ratios of MAH, MAS, APEG and MAH-β-CD were 2.5: 0.5 : 1 : 0.1 in the presence of 1 mol% APS of all molar of vinyl monomers at 90 °C for 5 h. Meanwhile, the molecular structure was characterized by FTIR spectrum.

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.

Synthesis of Poly(acrylamide-Methacrylate)-G-Octylphenyl Polyoxyethylene and its Micellar Behavior in Aqueous Solution

2011 ◽  
Vol 239-242 ◽  
pp. 3337-3341
Author(s):  
Dong Xia Zhang ◽  
Wen Hui Hu ◽  
Fang Ping Wang ◽  
Lin Ke Xue ◽  
Xin Zhen Du
Keyword(s):  
Aqueous Solution ◽  
Graft Copolymer ◽  
Main Chain ◽  
Radical Copolymerization ◽  
Molar Ratio ◽  
Free Radical Copolymerization ◽  
Transmission Electron ◽  
Spherical Micelles ◽  
Acrylamide Monomer ◽  
Poly Acrylamide

An amphiphilic graft copolymer with poly(acrylamide-methacrylate) as a main chain and octylphenyl polyoxyethylene as side chains (P(AM-MA)-g-C8PhEO10) was successfully synthesized via free radical copolymerization. The structure and the composition of the graft copolymer were characterized by FTIR, 1H-NMR and elemental analysis (EA) in detail. The absolute molecular weight of the copolymer is 1.304×106, as determined by static light scattering (SLS). The molar ratio of acrylamide monomer to the macromonomer is 33:1 in the copolymer and 53 C8PhEO10 branch chains attach to a P(AM-MA) backbone. The micellar behavior of P(AM-MA)-g-C8PhEO10 was preliminarily studied by means of surface tension measurements, transmission electron microscope (TEM) in aqueous solution. It was found that the stable spherical micelles with core-shell structure are formed and polymolecular micelles are larger and more compact than monomolecular micelles. In addition, the graft copolymer has favorable thermal stability.

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