Polyethylene Furanoate
Identifiers
Hazards
Where is Polyethylene Furanoate used, and what role does it play in each application?
Polyethylene furanoate (PEF) is primarily used as a high-performance gas barrier resin in packaging, particularly in blow-molded bottles and multilayer containers. In these applications, it functions as a barrier layer positioned between polyethylene terephthalate (PET) layers to reduce gas permeation, with claimed concentrations of 0.05–10% by mass. Beyond packaging, PEF is claimed as a barrier layer against substance migration in electrical cables and as a base polymer in plastic alloys with thermoplastic polyurethane for composite fiber materials. Its role consistently centers on providing barrier properties while enabling recyclability of PET structures.
Which product or formulation problem does Polyethylene Furanoate address?
PEF addresses the formulation problem of inadequate gas barrier performance in PET-based packaging, which limits shelf life for beverages and other oxygen-sensitive products. By incorporating a thin PEF layer (0.05–10% by mass) into multilayer containers, the claimed approach improves barrier properties without compromising the structural role of PET. Additionally, PEF solves the challenge of incorporating bio-based content into packaging, with claims of achieving at least 4% bio-based content when derived from biomass-based monomers. In cable applications, it solves the problem of substance migration through cladding layers.
What supports the main commercial or clinical uses of Polyethylene Furanoate?
The main uses of PEF are supported by patent applications, not by commercial product data or clinical evidence. Twelve patents describe PEF as a barrier resin for blow-molded bottles, multilayer containers, and preforms, with specific claims on intrinsic viscosity (1.1–1.50 dl/g) and layer placement to enable recycled PET recovery. Additional patents cover PEF as a migration barrier in cables and as a base polymer in plastic alloys. No marketplace data, production volumes, or regulatory approvals are available in the evidence, so adoption beyond patent filings remains unverified.
Which formulation trade-offs should researchers consider for Polyethylene Furanoate?
Researchers must balance PEF's barrier benefits against processing and compatibility trade-offs. Patents specify high intrinsic viscosity (1.1–1.50 dl/g) for bottle applications, requiring controlled polycondensation with catalysts like titanium and stabilizers such as triphenyl phosphate. In multilayer PET structures, PEF content is limited to 0.05–10% by mass to maintain recyclability, and layer placement must be precise to avoid interfering with PET recovery. Blending PEF with thermoplastic polyurethane requires melt temperatures around 220–235°C and specific drying steps, indicating thermal sensitivity. These constraints affect cost, process complexity, and final material properties.
What are the physicochemical properties of Polyethylene furanoate?
| Property | Value | Category |
|---|---|---|
| Physical Description | Ethylene glycol is a clear, colorless syrupy liquid. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. Since it is a liquid it can easily penetrate the soil and contaminate groundwater and nearby streams, CBI; Other Solid; Liquid, PEG 400 is a clear, viscous, colourless or almost colourless hygroscopic liquid; PEG 3000, PEG 3350, PEG 4000, PEG 6000 and PEG 8000 are white or almost white solids with a waxy or paraffin-like appearance, Clear, colorless, syrupy, odorless liquid. [antifreeze] [Note: A solid below 9 degrees F.]; [NIOSH], Liquid, ODOURLESS COLOURLESS VISCOUS HYGROSCOPIC LIQUID, Clear, colorless, syrupy, odorless liquid, Clear, colorless, syrupy, odorless liquid. [antifreeze] [Note: A solid below 9 °F.], Clear, colorless, syrupy (viscous) liquid at room temperature. Often colored fluorescent yellow-green when used in automotive antifreeze | Appearance |
| Color/Form | Clear, colorless, syrupy, liquid [Note: A solid below 9 degrees F] | Appearance |
| Odor | Odorless | Appearance |
| Taste | Sweet taste, Bittersweet taste | Appearance |
| Solubility | greater than or equal to 100 mg/mL at 63.5 °F, PEG 400 is miscible with water, very soluble in acetone, in alcohol and in methylene chloride, practically insoluble in fatty oils and in mineral oils; PEG 3000 and PEG 3350: very soluble in water and in methylene chloride, very slightly soluble in alcohol, practically insoluble in fatty oils and in mineral oils; PEG 4000, PEG 6000 and PEG 8000: very soluble in water and in methylene chloride, practically insoluble in alcohol and in fatty oils and in mineral oils, Miscible with lower aliphatic alcohols, glycerol, acetic acid, acetone and similar ketones, aldehydes, pyridine, similar coal tar bases; slightly soluble in ether (1:200); practically insoluble in benzene, its homologs, chlorinated hydrocarbons, petroleum ether, oils, Miscible with water, Solubility in water: miscible, Miscible | Formulation Relevant Properties |
| LogP | log Kow = -1.36, -1.36 | Formulation Relevant Properties |
| Dissociation Constants | pKa = 15.1 | Formulation Relevant Properties |
| Boiling Point | 387.7 °F at 760 mmHg, 197.3 °C, 197.00 to 198.00 °C. @ 760.00 mm Hg, 197 °C, 388 °F, 197.3 °C @760 [mm Hg] | Handling Relevant Properties |
| Melting Point | 9 °F, PEG 400: 4-8 °C; PEG 3000: 50-56 °C; PEG 3350: 53-57 °C; PEG 4000: 53-59 °C; PEG 6000:55-61 °C; PEG 8000: 55-62 °C, -12.69 °C, 4 - 10 °C, -13 °C | Handling Relevant Properties |
| Flash Point | 232 °F, 232 °F (111 °C) (closed cup), 111.11 °C c.c., 115 °C o.c | Handling Relevant Properties |
Which formulation benchmark best contextualizes Polyethylene Furanoate, and what differs?
Polyethylene terephthalate (PET) serves as the primary formulation benchmark for PEF, as most patent claims position PEF as a barrier layer within PET-based containers. The key difference is functional: PET provides structural integrity, while PEF adds gas barrier performance. In multilayer designs, PEF is used at low concentrations (0.05–10% by mass) to enhance barrier properties without sacrificing PET's recyclability. Unlike PET, PEF can be derived from biomass-based monomers, enabling bio-based content claims. However, PEF requires higher intrinsic viscosity and specialized processing, making it a performance additive rather than a direct PET replacement.