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Types of Step-Growth Polymers: Polyesters

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...

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Updated: Apr 14, 2026

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

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Published on: November 30, 2020

Accurate quantification of polyester in textiles through complete depolymerisation and HPLC.

Mattia Cerri¹, Leena Pitkänen¹, Corné Schutgens¹

¹Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, Espoo, Finland. mattia.cerri@aalto.fi.

Analytical Methods : Advancing Methods and Applications

|April 13, 2026

Summary

This summary is machine-generated.

Textile waste recycling requires accurate characterization. This study presents a new analytical method to quantify poly(ethylene terephthalate) in synthetic fibers, crucial for effective textile recycling.

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Isolation and Compositional Analysis of Plant Cuticle Lipid Polyester Monomers

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Area of Science:

Materials Science
Analytical Chemistry
Environmental Science

Background:

Textile waste is a significant environmental issue, with most ending up in landfills or incinerated.
Current recycling technologies require homogenous feedstocks, necessitating accurate textile waste characterization.
Existing analytical methods lack the precision to detect contaminants within acceptable limits for recycling.

Purpose of the Study:

To develop and validate a selective analytical method for quantifying poly(ethylene terephthalate) (PET) in synthetic textile waste.
To address the need for precise characterization of textile waste components for improved recycling processes.
To enable accurate feedstock production for advanced textile recycling technologies.

Main Methods:

Complete depolymerization of synthetic fibers into their constituent monomers.
Characterization of depolymerization products using chromatography.
Selective quantification of terephthalic acid, a depolymerization product of PET, via high-performance liquid chromatography (HPLC).

Main Results:

Successfully developed an analytical method for selective PET quantification.
Demonstrated the capability of HPLC to accurately determine terephthalic acid concentrations.
Established a method for generating an accurate compositional fingerprint of synthetic fibers.

Conclusions:

The developed HPLC method provides a precise way to quantify PET in textile waste.
Accurate quantification of PET is essential for producing homogenous feedstocks for recycling.
This analytical approach supports the advancement of sustainable textile recycling practices.