Publication

Thermogravimetric studies on the condensation kinetics of fully aromatic polyesters

Albert Renken
1995
Book Chapters

Abstract

The kinetics of the polycondensation of a fully arom. polyester was studied. The mass-loss curves examd. with a thermogravimetric balance were analyzed on the basis of a kinetic model. Under the exptl. conditions used the polycondensation of 4-acetoxybenzoic acid (ABA) can be supposed to be irreversible and of 2nd order. The model takes into account the simultaneous evapn. of the monomer and the formed low mol. volatile product (acetic acid). The reaction temp. was varied in the range of 194 to 294 DegC. Different catalysts such as Fe-, Na-, and K-acetate were used to accelerate the polycondensation reaction. The height of the sample layer has an important influence on the global kinetics. The model parameters were estd. by a non-linear curve fitting with a com. available program. [on SciFinder (R)]

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https://infoscience.epfl.ch/entities/publication/4aa3ce3c-84d2-4173-8643-cfecd2322028

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Albert Renken
1995
Book Chapters

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4aa3ce3c-84d2-4173-8643-cfecd2322028

About this result

Related concepts (29)

Thermogravimetric analysis

Thermogravimetric analysis or thermal gravimetric analysis (TGA) is a method of thermal analysis in which the mass of a sample is measured over time as the temperature changes. This measurement provides information about physical phenomena, such as phase transitions, absorption, adsorption and desorption; as well as chemical phenomena including chemisorptions, thermal decomposition, and solid-gas reactions (e.g., oxidation or reduction). Thermogravimetric analysis (TGA) is conducted on an instrument referred to as a thermogravimetric analyzer.

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.

Acetic anhydride

Acetic anhydride, or ethanoic anhydride, is the chemical compound with the formula . Commonly abbreviated , it is the simplest isolable anhydride of a carboxylic acid and is widely used as a reagent in organic synthesis. It is a colorless liquid that smells strongly of acetic acid, which is formed by its reaction with moisture in the air. Acetic anhydride, like most acid anhydrides, is a flexible molecule with a nonplanar structure.

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Thermogravimetric studies on the condensation kinetics of fully aromatic polyesters

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