The mechanism of formation of phase structure of epoxide-rubber systems

Roginskaya, G.F.; Волков, В. П.; Богданова, Л. М.; Chalykh, A.Ye.; Розенберг, Б. А.

doi:10.1016/0032-3950(83)90431-8

Cited by 7 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The simulation gives a correct prediction of the possibility of phase inversion, the arrest of phase separation at the gel point (although evolution of the morphology in dispersed-phase domains may continue after gelation), the presence of epoxy copolymer in the dispersed phase, the increase in the volume fraction and average size of dispersed domain with the initial rubber concentration, the presence of a maximum in the average size of particles as a function of cure temperature, and the possibility of generating bimodal distributions of particle sizes. Similar arguments explaining the phase separation process in terms of a nucleation-growth mechanism were employed by Roginskaya and co-workers (14).…”

mentioning

confidence: 85%

Rubber-Modified Epoxies

Verchére

Sautereau

Pascault

et al. 1993

Advances in Chemistry

View full text Add to dashboard Cite

The phase-separation process of a diepoxide based on bisphenol A diglycidyl ether cured with a cycloaliphatic diamine in the presence of an epoxy-terminated butadiene-acrylonitrile random copolymer (ETBN) was experimentally studied and theoretically simulated. The increase in the average molecular weight of the epoxy-amine polymer is shown to be the main thermodynamic factor leading to phase separation. The competition between nucleation-growth and spinodal decomposition is analyzed. Low values of interfacial tensions and polymerization rates favor the first mechanism in most cases. A secondary phase separation must occur inside the dispersed particles, leading to a segregated epoxy-amine phase. The theoretical simulation explains the increase of the average diameter of dispersed-phase particles with increasing polymerization temperature. The volume fraction of dispersed phase is the dominating factor affecting fracture toughness.TO IMPROVE CRACK RESISTANCE AND IMPACT STRENGTH, low levels of carboxyl-or epoxy-terminated butadiene-acrylonitrile random copolymers (CTBN or ETBN) are often incorporated into normally brittle epoxy resins. This enhancement in toughness results from the separation during cure of a randomly dispersed rubbery phase (1-7).

show abstract

mentioning

confidence: 85%

Rubber-Modified Epoxies

Verchére

Sautereau

Pascault

et al. 1993

Advances in Chemistry

View full text Add to dashboard Cite

show abstract

Rubber‐modified epoxies. III. Analysis of experimental trends through a phase separation model

Moschiar

Riccardi

Williams

et al. 1991

J of Applied Polymer Sci

View full text Add to dashboard Cite

A phase separation model was used to simulate the morphologies obtained in a system consisting of a diepoxide based on bisphenol-A diglycidylether cured with a cycloaliphatic diamine, in the presence of an epoxy-terminated butadiene-acrylonitrile random copolymer (ETBN) . A detailed analysis of experimental factors affecting resulting morphologies was previously reported. The model, based on a thermodynamic description through a FloryHuggins equation, and constitutive equations for polymerization and phase separation rates, could explain most of the observed trends. A nucleation-growth mechanism was believed to take place because of the very low values of interfacial tensions for this type of systems. Conditions which would lead to spinodal demixing are also discussed.

show abstract

Some aspects of the control of physico‐mechanical properties of polymer compositions with elastomeric inclusions

Розенберг¹

1991

Makromolekulare Chemie. Macromolecular Symposia

View full text Add to dashboard Cite

The paper reviews the author's works on the regulation of physico‐mechanical properties of polymer compositions with elastomeric inclusions. The factors, determining the modification efficiency of elastomeric inclusions in epoxy matrices, are analyzed. The regularities of the phase separation in curing system and the control of the interface interaction and morphology of epoxy polymers with elastomeric inclusions are considered.

show abstract

The mechanism of formation of phase structure of epoxide-rubber systems

Cited by 7 publications

References 3 publications

Rubber-Modified Epoxies

Rubber-Modified Epoxies

Rubber‐modified epoxies. III. Analysis of experimental trends through a phase separation model

Some aspects of the control of physico‐mechanical properties of polymer compositions with elastomeric inclusions

Contact Info

Product

Resources

About