scholarly journals On the inverse miniemulsion copolymerization and terpolymerization of acrylamide, N, N′-methylenebis(acrylamide) and methacrylic acid

2003 ◽  
Vol 1 (3) ◽  
pp. 291-304 ◽  
Author(s):  
I. Capek
Keyword(s):  
Methacrylic Acid ◽  
Particle Concentration ◽  
Continuous Medium ◽  
Miniemulsion Polymerization ◽  
Radical Copolymerization ◽  
Polymerization Rate ◽  
Microemulsion Polymerization ◽  
Free Radical Copolymerization ◽  
Rate Of Polymerization ◽  
Kinetics Of

AbstractThe kinetics of free-radical copolymerization and terpolymerization of acrylamide (AAm), N, N′-methylenebis(acrylamide) (MBA) and methacrylic acid (MA) in the inverse water/monomer/cyclohexane/Tween 85 miniemulsion was investigated. Polymerizable sterically-stable miniemulsions were formulated in cyclohexane as a continuous medium. Polymerizations are very fast and reach the final conversion within several minutes. The dependence of the polymerization rate vs. conversion is described by a curve with two nonstationary rate intervals. The maximum rate of polymerization slightly increases with increasing concentration of crosslinking monomer (MBA) and strongly decreases by the addition of MA. The rate of polymerization is inversely proportional to the 0.9th and 1.8th power of the particle concentration without and with MA, respectively. The number of polymer particles is inversely proportional to the 0.18th and 0.13th power of MBA concentration. The kinetic and colloidal parameters of the miniemulsion polymerization are discussed in terms of microemulsion polymerization model.

Slow-Release Behaviors of Poly(vinyl alcohol)/Poly(N, N-diethylacrylamide-co-methacrylic acid) Semi-IPN Materials

2013 ◽  
Vol 709 ◽  
pp. 135-138 ◽  
Author(s):  
Xiao Qi Li ◽  
Nai Yan Zhang ◽  
Yang Xue Li ◽  
Hong Jin Li
Keyword(s):  
Methacrylic Acid ◽  
Vinyl Alcohol ◽  
Polymer Network ◽  
Ammonium Persulfate ◽  
Radical Copolymerization ◽  
Polymer Materials ◽  
Interpenetrating Polymer Network ◽  
Poly Vinyl Alcohol ◽  
Porous Network ◽  
Free Radical Copolymerization

A series of semi-interpenetrating polymer materials of poly (vinyl alcohol)/poly (N, N-diethylacrylamide-co-methacrylic acid)(PVA/PDM) were synthesized by free radical copolymerization techniques and semi-interpenetrating polymer network techniques at room temperature with ammonium persulfate and N,N,N',N'-tetramethylethylene diamide as initiators and N,N'-methylenebisacrylamide as a crosslinker. The interior morphology by scanning electron microscopy (SEM) revealed that PVA introduced PDM materials have interconnected porous network structures. The release behaviors of the model drug, aminophylline, are found dependent on material composition and environmental temperature, which suggests that these materials have potential application as intelligent release carriers.

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.

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