Publication

Thermodynamic Evolution of Unsaturated Polyester-Styrene-Hyperbranched Polymers

Jan-Anders Edvin Maansson, Raffaele Mezzenga
2001
Journal Articles

Abstract

The free energy of mixing during cure has been modeled for different blends of linear unsaturated polyester, styrene and allyl ether functional hyperbranched polymers. The molecular weight of the blend components has been implemented as measured by gel permeation chromatography (GPC) into the Flory-Huggins equation. This approach enables the distinction to be made between the contributions of enthalpy and entropy of mixing, the latter being automatically followed during curing by the development of average molecular weights. The model allows gaining an idea of the factors acting as driving forces for chemically induced phase separation in these blends.

Official source

https://infoscience.epfl.ch/entities/publication/c9d96d4a-7fad-4c17-920f-f6a54b446a60

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Jan-Anders Edvin Maansson, Raffaele Mezzenga
2001
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/c9d96d4a-7fad-4c17-920f-f6a54b446a60

About this result

Related concepts (32)

Polyester

Polyester is a category of polymers that contain the ester functional group in every repeat unit of their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include naturally occurring chemicals, such as in plants and insects, as well as synthetics such as polybutyrate. Natural polyesters and a few synthetic ones are biodegradable, but most synthetic polyesters are not. Synthetic polyesters are used extensively in clothing.

Molar mass distribution

In polymer chemistry, the molar mass distribution (or molecular weight distribution) describes the relationship between the number of moles of each polymer species (Ni) and the molar mass (Mi) of that species. In linear polymers, the individual polymer chains rarely have exactly the same degree of polymerization and molar mass, and there is always a distribution around an average value. The molar mass distribution of a polymer may be modified by polymer fractionation.

Molecular mass

The molecular mass (m) is the mass of a given molecule, for which the unit dalton (Da) is used. Different molecules of the same compound may have different molecular masses because they contain different isotopes of an element. The related quantity relative molecular mass, as defined by IUPAC, is the ratio of the mass of a molecule to the atomic mass constant (which is equal to one dalton) and is unitless. The molecular mass and relative molecular mass are distinct from but related to the molar mass.

Related publications (1)

Thermodynamic Evolution of Unsaturated Polyester-Styrene-Hyperbranched Polymers

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