Phase equilibria and phase structures of polymer blends

Чалых, А. Е.; Герасимов, В. К.

doi:10.1070/rc2004v073n01abeh000859

Cited by 27 publications

(2 citation statements)

References 28 publications

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“…During the application of a mechanical field, the mutual solubility of the components may either increase or decrease [33][34][35][36][37][38]. For polymer-solvent systems at low molecular masses of the polymer, the miscibility of the components first increases and then decreases with an increase in the shear rate.…”

Section: Rheological Propertiesmentioning

confidence: 99%

Miscibility and rheological properties of epoxy resin blends with aromatic polyethers

et al. 2015

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The miscibility of the bisphenol A epoxy oligomer with a number of aromatic polyethers is studied via optical interferometry. It is shown that polysulfone and polycarbonate are unlimitedly soluble in the oli gomer. The dissolution of polycarbonate is accompanied by a chemical interaction and the formation of a new phase. For poly(ether sulfone) and poly(ether imide), amorphous phase separations with the LCST and the UCST, respectively, are observed. The polymer solutions are Newtonian liquids, and the systems in which phase separation occur feature the yield stress. A shift of the phase equilibrium lines during the action of shear is revealed.

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Section: Rheological Propertiesmentioning

confidence: 99%

Miscibility and rheological properties of epoxy resin blends with aromatic polyethers

et al. 2015

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“…In this case, we can use natural raw materials: vegetable oils that are mixtures of triglycerides from fatty acids [51]. Since miscibility usually increases with rising temperature (at least in the absence of hydrogen bonds [52][53][54][55]), it is reasonable to perform the mixing of an epoxy resin, a hardener, and a phase-change agent at a high temperature for better mutual solubility. In turn, this limits the range of possible hardeners to low reactive substances to prevent rapid cross-linking of the system with the resulting high internal stresses.…”

Section: Introductionmentioning

confidence: 99%

Self-Lubricating and Shape-Stable Phase-Change Materials Based on Epoxy Resin and Vegetable Oils

Ilyina,

Gorbunova,

Makarova

et al. 2023

Polymers

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Palm or coconut oil is capable of dissolving in a mixture of bisphenol A-based epoxy resin and a high-temperature hardener (4,4′-diaminodiphenyl sulfone) when heated and then forms a dispersed phase as a result of cross-linking and molecular weight growth of the epoxy medium. Achieving the temporary miscibility between the curing epoxy matrix and the vegetable oil allows a uniform distribution of vegetable oil droplets in the epoxy medium. This novel approach to creating a dispersed phase-change material made a cured epoxy polymer containing up to 20% oil. The miscibility of epoxy resin and oil was studied by laser interferometry, and phase state diagrams of binary mixtures were calculated according to theory and experiments. A weak effect of oil on the viscosity and kinetics of the epoxy resin curing was demonstrated by rotational rheometry. According to differential scanning calorimetry and dynamic mechanical analysis, the oil plasticizes the epoxy matrix slightly, expanding its glass transition region towards low temperatures and reducing its elastic modulus. In the cured epoxy matrix, oil droplets have a diameter of 3–14 µm and are incapable of complete crystallization due to their multi-component chemical composition and non-disappeared limited miscibility. The obtained phase-change materials have relatively low specific energy capacity but can be used alternatively as self-lubricating low-noise materials due to dispersed oil, high stiffness, and reduced friction coefficient. Palm oil crystallizes more readily, better matching the creation of phase-change materials, whereas coconut oil crystallization is more suppressed, making it better for reducing the friction coefficient of the oil-containing material.

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