Interpenetrating Polymer Networks Based on Polyurethane and Poly(butyl methacrylate): Interrelation Between Reaction Kinetics and Microphase Structure

Lipatov, Yu.S.; Alekseeva, T. T.

doi:10.1002/(sici)1099-1581(199604)7:4<234::aid-pat528>3.0.co;2-3

Cited by 12 publications

(8 citation statements)

References 4 publications

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“…The following investigations on IPNs have fully confirmed the concept5–8, 11 that the simultaneous chemical reactions are accompanied by phase separation. In Reference 7 for the first time, it was shown that phase separation in IPNs proceeds according to spinodal mechanism.…”

Section: Introductionmentioning

confidence: 53%

“…However, analysis of the conditions of phase separation during chemical reaction and their interconnection with the reaction kinetics have not been investigated up to now. Meanwhile, for interpenetrating polymer networks (IPN), there are many papers showing the interdependence between chemical reactions of the formation of two independent networks and phase separation 2–11. Formation of IPNs is based on the simultaneous reactions of the synthesis of two cross‐linked polymers under conditions where each polymer is formed according its own reaction mechanism (for example, radical polymerization and polycondensation).…”

Section: Introductionmentioning

confidence: 99%

“…Since the publication of the famous book by Sperling2 it has been accepted that the two parallel reactions are not linked, for many IPNs of various chemical compositions, and those, especially based on polyurethanes and polyacrylates, ie there is no chemical interaction between the two network components. At the same time, as early as 1989, it was established that the kinetic conditions of both reactions are interdependent 3–9…”

Section: Introductionmentioning

confidence: 99%

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Phase separation in blends of linear polymers formed in situ according to different mechanisms

Lipatov

Kosyanchuk

Nesterov

2002

Polymer International

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The in situ formation of blends of two incompatible polymers was studied. The kinetics of simultaneously proceeding reactions of radical polymerization of methyl methacrylate and polyaddition reaction of polyurethane formation was investigated for various ratios of monomeric compounds in the reaction mixture. It was established that the kinetics of formation of each polymer in the mixture depends on the presence of the other and on the kinetics of its formation. These parallel reactions are accompanied by phase separation at a definite conversion degree of each monomer. The onset of phase separation does not affect the course of the kinetic curves. The regularities of phase separation in connection with reaction kinetics were investigated by light scattering. It was found that because of the difference in the rates of the two reactions, the ratio of the polymers formed in the reaction mixture continually changes in time. In spite of this, initial stages of the phase separation may be considered as proceeding according to the spinodal mechanism. Values of amplification factors were calculated which depend on the component ratio and reaction rates. It was established that reaction‐induced phase separation determines the formation of the interconnected morphology immediately after the onset of phase separation, when the composition of the polymer blends has not yet reached its equilibrium value. © 2002 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase separation in blends of linear polymers formed in situ according to different mechanisms

Lipatov

Kosyanchuk

Nesterov

2002

Polymer International

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“…The reaction of IPN formation proceeds at conditions accompanied by the transition from the one-phase to two-phase state in the course of reaction at a de nite conversion degree. As a result, a two-phase system is formed with phases differing in their composition, the latter being dependent on the kinetic conditions of reaction [11]. IPN may be considered as 'chemical' alloys and have all the features typical of alloys of linear polymers.…”

Section: Thermodynamic Approachmentioning

confidence: 97%

Adhesion at the polymer blend-solid interface

Lipatov

2000

Composite Interfaces

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A thermodynamic approach to adhesion of polymer blends to solid is proposed. The different cases of compatible and incompatible blends are considered. The difference has been achieved between adhesion of polymer blends obtained by mixing two polymers in the region of two-phase melt and polymer alloys that initially by mixing are in the region of one-phase state and then, by changing temperature, transition into two-phase region.The mechanism of adhesion joint formation is different for polymer blends and polymer alloys, possibly related to phase transformation by cooling the melt in presence of a solid. The effects depend on the nature of the critical solution temperature. The conditions of the complete wetting the surface by one mixture component (or phase) and incomplete wetting by both components are established.General conclusions have been drawn as to the distinction between adhesion of polymer blends and alloys and adhesion of individual polymers to the surface. For polymer blends and alloys with complete wetting of the surface by one component, the interphase is formed by two layers: a rst layer in direct contact with the solid surface (wetting layer) and a second layer between wetting layer and blend matrix. If adhesion between wetting layer and a matrix is lower than adhesion between wetting layer and solid, the failure of adhesion joints will take place in the zone of the contact between two blend components. After the phase inversion, there occurs a transition of the failure zone to the interface with solid. The transition from adhesion failure between the blend components to adhesion between the blend matrix and solid is a speci c feature of adhesion of two-phase blends or alloys.

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“…A fundamental phenomenon associated with nearly all IPNs is phase separation. Although a huge effort has been made,3–8 the effect of morphology on the mechanical damping of IPNs has not yet been clearly understood. Until recently,9, 10 IPN interphase content could not be analyzed quantitatively.…”

Section: Introductionmentioning

confidence: 99%

Correlation between mechanical damping and interphase content in interpenetrating polymer networks

Song

Hourston

Schafer

2001

J of Applied Polymer Sci

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ABSTRACT:Recently, some interpenetrating polymer networks with good mechanical damping properties have been synthesized. However, the effect of morphology on this property has not yet been clearly elucidated. Herein, two polystyrene-polyurethane interpenetrating polymer networks, which were grafted using TMI [benzene-1-(1-isocyanato-1-methyl ethyl)-3-(1-methylenyl)] and HEMA (2-hydroxyethyl methacrylate), respectively, have been investigated, as model samples, by modulated-temperature differential scanning calorimetry and by dynamical mechanical thermal analysis. The results indicate that there is a correlation between mechanical damping and both interphase content and the distribution of composition in the interphase region. The findings should provide valuable information for the design of future damping materials.

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Interpenetrating Polymer Networks Based on Polyurethane and Poly(butyl methacrylate): Interrelation Between Reaction Kinetics and Microphase Structure

Cited by 12 publications

References 4 publications

Phase separation in blends of linear polymers formed in situ according to different mechanisms

Phase separation in blends of linear polymers formed in situ according to different mechanisms

Adhesion at the polymer blend-solid interface

Correlation between mechanical damping and interphase content in interpenetrating polymer networks

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