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Types of Step-Growth Polymers: Polyesters

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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.
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Updated: Jul 23, 2025

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

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Published on: November 30, 2020

Prospects for Recyclable Multilayer Packaging: A Case Study.

Martina Seier¹, Vasiliki-Maria Archodoulaki¹, Thomas Koch¹

¹Institute of Materials Science and Technology, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria.

|July 14, 2023

Summary

This summary is machine-generated.

Polypropylene (PP) multilayer packaging shows excellent recyclability, maintaining properties over 10 cycles for sustainable food preservation. Polyethylene terephthalate (PET) packaging, however, becomes brittle, limiting its circular economy potential.

Keywords:

modified atmosphere multilayer packaging polyolefins recycling waste management

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Area of Science:

Polymer science and engineering
Sustainable materials science
Circular economy principles

Background:

Food preservation relies heavily on polymer packaging, especially multilayer films for modified atmosphere packaging (MAP).
Current MAP films often combine various polymers, enhancing performance but hindering recyclability.
The EU's Circular Economy Action Plan prioritizes sustainable plastic packaging, necessitating improved multilayer solutions.

Purpose of the Study:

To evaluate and compare the recycling potential of post-consumer, functionally equivalent polyethylene terephthalate (PET) and polypropylene (PP) MAP.
To assess the impact of recycling on material properties and functionality for closed-loop applications.

Main Methods:

Detailed structure analysis of post-consumer MAP films.
Recycling simulations to assess material behavior over multiple cycles.
Testing of mechanical properties and functionality of recycled materials.

Main Results:

Both PET and PP MAP contained essential functional and barrier layers.
PP-based MAP demonstrated recyclability over 10 cycles, retaining mechanical properties and functionality.
PET-based MAP degraded into a brittle material unsuitable for high-value reprocessing.
Recycled PP material was successfully converted into new films, proving closed-loop viability.

Conclusions:

PP-based multilayer MAP offers significant potential for closed-loop recycling in sustainable packaging.
PET-based MAP currently presents limitations for circular economy applications due to material degradation.
Designing multilayers for recyclability is crucial for advancing the circular economy in food packaging, though purification challenges remain.