Filler effect on polymerization kinetics and phase separation in polymer blends formed in situ

The kinetics of formation of a mixture of two polymers [poly(methyl methacrylate) and polyurethane] in situ in the course of two simultaneously proceeding reactions was studied in the presence of various amount of a filler (fumed silica). It was shown that the filler affects the rates of both reacti...

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Published inPolymer international Vol. 52; no. 5; pp. 664 - 669
Main Authors Lipatov, Yu S, Kosyanchuk, L V, Nesterov, A E, Antonenko, O I
Format Journal Article
LanguageEnglish
Published Chichester, UK John Wiley & Sons, Ltd 01.05.2003
Wiley
Subjects
Applied sciences
blend formation
Composites
Exact sciences and technology
Forms of application and semi-finished materials
in situ blend formation
phase separation
Polymer industry, paints, wood
spinodal decomposition
Technology of polymers
Polymer blends
Methyl methacrylate polymer
spinodal decomposition
Dispersion reinforced material
Experimental study
Polyaddition
Silica
Composite material
Free radical polymerization
Morphology
Phase separation
Polyurethane
blend formation
Concentration effect
Simultaneous reaction
Kinetic parameter
in situ blend formation
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Summary:The kinetics of formation of a mixture of two polymers [poly(methyl methacrylate) and polyurethane] in situ in the course of two simultaneously proceeding reactions was studied in the presence of various amount of a filler (fumed silica). It was shown that the filler affects the rates of both reactions. In addition, the filler exerts an influence on the phase separation induced by the chemical reaction increasing the amount of a filler increases the time for the onset of phase separation. The effects observed may be explained both by the increase in the viscosity of the reaction system due to introduction of a filler and by selective adsorption of reaction system components at the interface with filler particles. In all cases, phase separation in the early stages of reaction proceeds in a four‐component system (two polymers formed and two initial compounds) and obeys the spinodal mechanism. It is also shown that the final morphology is determined far from the end of the reaction and before establishing the equilibrium state. © 2003 Society of Chemical Industry
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ISSN:0959-8103
1097-0126
DOI:10.1002/pi.937