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Plastics & Elastomers
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Plastics & Elastomers
Polyethylene Furanoate

Polyethylene Furanoate (PEF) - The Rising Star Amongst Today's Bioplastics

Bioplastics are a key sustainable element of the 21st century. They balance environmental benefits and impact. Polyethylene furanoate (PEF) is a popular bio-based polymer. This next-generation material can replace oil-based polymers.

PEF is renewable, non-toxic, and recyclable. It has similar properties to traditional plastics. However, efficient commercial production of PEF requires consideration. We must look at aspects like:

  • the chemical composition and key properties of PEF that make it superior to PET
  • the furanic monomer family that makes PEF and the methods of monomer production
  • the closing-the-loop scenario of PEF and the steps followed in its recycling process
  • the scaling of PEF from the lab to the market


What is Polyethylene Furanoate (PEF)?

What is Polyethylene Furanoate (PEF)?

Polyethylene furanoate (PEF) is a 100% recyclable, bio-based polymer. It is made from renewable plant sugars. PEF production polymerizes furan dicarboxylic acid and ethylene glycol. The process resembles PET production. But PEF substitutes terephthalic acid with 2,5 furan dicarboxylic acid (FDCA).

Synthesis of Polyethylene Furanoate

PEF is the next-gen polyester. It has potential to replace polyethylene terephthalate (PET) - a durable fossil fuel-based polymer.

PEF vs. PET — Outperforming across key properties

Compared to PET, PEF offers benefits. Notable PEF properties include:

  • Biodegradability — PEF biodegrades under industrial composting. It breaks down much faster than plastics like PET.

  • Gas barrier properties — PEF has better gas barrier than PET. This makes PEF suitable to package carbonated drinks. Preventing gas escape is important.

  • Mechanical properties — PEF has excellent oxygen barrier and good mechanical properties. Its tensile strength exceeds PET while rigidity is similar. This enables thinner, material saving PEF bottles.

  • Thermal properties — PEF withstands higher temperatures. It has a higher glass transition temperature, modulus and melting point versus PET.

  • Renewability — PEF uses renewable plant sugars. PET uses fossil fuels. This gives PEF sustainability benefits. FDCA-based PEF is 100% biobased when using biobased MEG.

  • Recyclability — PEF is theoretically recyclable, though infrastructure needs development. The goal is to integrate PEF recycling into existing PET recycling.
Benefits of PEF Over Other Commodity Plastics
PEF vs. Existing Packaging Materials (Source: Avantium)

PEF permits greater light weighting and superior thermal stability without heat-setting (can be hot filled at about 200 °F). PEF needs fewer additives than PET for formation. Currently, PEF costs slightly more. However, as scale increases, PEF costs should reach parity or better with PET.

Property PEF vs. PET Benefit
Barrier * O2 6 - 10 x 1 x
  • Increased shelf life
  • Avoid barrier layers
CO2 4 - 6 x 1 x
  • Increased shelf life
  • Avoid barrier layers
H2O 2 x 1 x
  • Better performance in humid areas
Mechanical Tensile modulus ~ 1.6 x 1 x
  • For rigid bottles
  • Increased top loads
Thermal Tg (°C) 86 - 87 74 - 79
  • For hot filling of nutritious drinks
Tm (°C) 213 - 235 234 - 265
  • Co-extrusion possibilities
* measured and validated in several inhouse research projects as of 2014
PEF vs. PET - Comparision of Properties (Source: Corbion)

Furanic Family: The Sleeping Giants of Intermediate Chemicals

Furanic Family: The Sleeping Giants of Intermediate Chemicals

5-hydroxymethylfurfural (5-HMF), 2,5-furandicarboxylic acid (FDCA), and 2,5-dimethylfuran (2,5-DMF) are the main representatives of the furan family. Furans have enormous potential as renewable intermediate chemicals. This has led to them being called “sleeping giants" of renewable intermediate chemicals.

C6 sugars (carbohydrates) are excellent sources for producing furanic monomers. HMF and FDCA show high potential as precursors for PEF.

HMF and FDCA - High Potential Starting Materials (Precursors) for PEF
Source: Avantium

FDCA (C6H6O3; MW = 126.11) is a bio-based building block for resins and polymers. It is used to produce high-value products including:

FDCA forms by the oxidative dehydration of hexose. It can also form by oxidizing 5-hydroxymethylfurfural (HMF).

FDCA has the potential to replace terephthalic acid (PTA). PTA is a widely used synthetic component for polyesters like polyethylene terephthalate (PET) and polybutylene terephthalate (PBT).

FDCA produces a new polymer class called PEF. PEF shows great potential for bio-based plastic bottles.

FDCA has a Large Potential as a Replacement of Terephthalic Acid (PTA)
Source: Avantium (Formly: Synvina)


Methods to produce FDCA

Some methods to produce FDCA are:

  1. Dehydrating of hexose derivatives
  2. Oxidizing of 2,5-disubstituted furans
  3. Catalytic conversion of furan derivatives

FDCA has many derivatives from simple chemical transformations. Selective reduction leads to:

  • Partially hydrogenated 2,5-dihydroxymethylfuran
  • Fully hydrogenated 2,5-bis(hydroxymethyl) tetrahydrofuran

These can be new polyester alcohol components. Combined with FDCA, this allows new biomass-derived products.

However, FDCA production has some barriers which include:

➤ High process cost
➤ Limited by intermediate 5-HMF availability
➤ Need effective, selective sugar dehydration processes - Could enable more building blocks. But current processes are non-selective unless unstable intermediates quickly become stable
➤ Requires developing selective systems and catalysts
➤ Must understand and control FDCA esterification reactions and polymer properties. This is vital for commercial success

Want to own your sustainability goals like a pro? Access targeted content that will guide your decision-making process and address critical questions along your sustainability journey.

PEF 1 PLA   PEF 2 PHA   PEF 3 Bioplastics 101   PEF 4 Biobased

Closing the Loop: Recycling and Its Positive Impact

Closing the Loop: Recycling and Its Positive Impact

Recycling of PEF Products made of PEF can easily be recycled or converted back to atmospheric CO2 by incineration. Eventually, that CO2 will be taken up by grass, weeds, and other plants, which can then be used to make more PEF.

PEF recycling is similar to PET recycling. It can be recycled and incorporated into the PET recycling streams at up to 5% PEF. It has no effect on the recycled PET performance.

  • PEF can be separated from PET by IR sorting and recycled to ‘rPEF’ using the same steps as PET (mechanical or chemical recycling using the same steps as PET).
  • PEF has significantly less impact on rPET than Nylon or PLA.

PEF reduces the need for multi-material functionality in packaging. However, there are still some steps to be taken in packaging re-design and waste management.

From waste to innovation: Steps for PEF recycling

1 CollectionCollection and sorting
PEF bottles, packaging, and other products are collected and sorted from post-consumer waste streams. This separation from other plastic types is important to obtain pure PEF waste.

2 ShreddingShredding and cleaning
The PEF material is shredded into smaller flakes/chips and thoroughly cleaned to remove impurities.

3 ExtrusionExtrusion
The flakes are dried and fed into an extruder system to be melted and extruded into pellets or granules. This converts the waste into a format usable for remanufacturing. View in-depth guide on extrusion process.

4 SSPSolid state polymerization (SSP)
The pellets undergo solid-state polymerization. This boosts their molecular weight and intrinsic viscosity, restoring mechanical properties.

5 RegrannulationRe-granulation
After SSP, the polymer pellets are re-granulated into smaller and more uniform sizes to prepare them as feedstock.

Injection MoldingProduct remanufacturing
The recycled PEF granules are finally used like virgin PEF resin. This helps to fabricate new bottles, sheets, and films via processes like injection molding and blow molding. They can be blended with some virgin PEF to tailor properties.

Growth Prospects of PEF: Lab to Market

Growth Prospects of PEF: Lab to Market

The utility of FDCA as a PET/PBT analog offers an opportunity to address a high-volume, high-value chemical market. To achieve this opportunity, R&D to develop selective oxidation and dehydration technology is being carried out.

2,5-furandicarboxylic acid (FDCA) is an important chemical intermediate for PEF production. Several chemical companies are currently working on manufacturing it.

  • AVA-CO2 offers a patented conversion process of 5-HMF to FDCA
  • Wageningen UR has successfully prepared FDCA semi-aromatic polyesters
  • Avantium, along with BASF is working towards making FDCA and PEF a commercial reality
  • Corbion is also working on the manufacture of FDCA for PEF
  • ETH Zurich develops a new method that could finally make the PEF marketable

Out of these Synvina (BASF + Avantium JV) and Corbion are focusing their energies on FDCA for PEF. Corbion has developed a propriety process to produce FDCA and is currently working with dedicated partners to further develop and commercialize it.

Value chain of FDCA to PEF
Source: Corbion

Avantium developed and patented the YXY technology platform. This is aimed at manufacturing biofuels, bio-based plastics, and biochemicals. The JV between Avantium and BASF established a strategic partnership with Danone, Coca-Cola, and ALPLA. This is for developing and commercializing bio-based polymers derived from PEF. Later on BASF exited from this JV in January 2019.

Synvina Progress - Lab to Industrial Scale
Source: Avantium (Formerly: Synvina)

In 2014, Avantium, Danone, Swire Pacific, and Coca-Cola signed a consortium of USD 50 million in investments. It is aimed at developing and commercializing the alternative to PET for packaging applications. In 2014, Avantium demonstrated the application of PEF for the manufacturing of fibers to make 100% bio-based t-shirts for textile manufacturers.

The Coca Cola company, Danone, ALPLA partner for the development of 100% bio-based PEF bottles. Wifag-polytype for PEF thermoformed products and other partnerships in various stages for PEF fibers, films, etc. However, commercial production and launch of FDCA and PEF is expected to be operation by 2024.

PEF - Plant-based Plastics for a Circular Future (Source: Avantium)

Another breakthrough research is reported by ETH Zurich researchers. It reveals a new method that could enable the commercial breakthrough of PEF. In their study, instead of making the usual "rope-like" polymer chains with two endpoints react, researchers first tie rings from the latter. Thus, they have no ends anymore. These rings can then be polymerized to PEF in a controlled manner.

The new method leads to no chemical by-product production when the rings are opened and connected to form the final long "polymer rope". The new method is claimed to reduce:

  • production time from several days to a few hours
  • energy requirements

Scientists are now further working with Suzler to investigate how the new process could be implemented in industrial mass production.

Looking for the latest industry updates on PEF? Find all updates here »

Key Applications

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2 Comments on "Polyethylene Furanoate (PEF) - The Rising Star Amongst Today's Bioplastics"
Leonardo M Mar 2, 2022
What on earth are you people talking about? This polymer does not actually exist on the market. Synvina has been abandoned by BASF in 2018, and is an empty husk. No plant was built in 2019. Or 2020. Or 2021. Or is under construction in 2022. Does "the future" ever get a simple update?
Heinrich Dr. H Aug 26, 2021
Very interesting and promising!

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