Solid aromatic-polyether resins for barrier layer applications

Overview

This technology addresses a critical materials challenge in barrier layer manufacturing by combining commercial polyether chains with aromatic diols derived from renewable feedstocks, particularly lignin. Existing solutions fall short: polyether ether ketone composed solely of aromatic rings melts at 650°F (too high for target processing), while aliphatic polyethers remain liquid at room temperature. The proposed formulations yield polyether-containing aromatic blocks that are solid at room temperature, thermally stable within a 350–500°F processing window, and feature symmetric structures that enhance barrier properties. If initial formulations require further tuning, renewable feedstock-derived compatibilisers can be added to improve melting point and chemical recyclability.

Technical specifications

Key features:

• Renewable feedstock integration: Aromatic diols sourced from lignin and woody biomass valorization
• Solid-state at room temperature: Overcomes the liquid limitation of pure aliphatic polyethers
• Thermal stability: Melting range of 350–500°F, compatible with standard industrial processing
• Symmetric molecular structures: Designed to enhance barrier layer performance
• Chemical recyclability: Compatibiliser additives from renewable sources support end-of-life recovery
• Scalable synthesis: Reaction conditions established at laboratory scale with a clear pathway to kilogram-scale production

The underlying research leverages extensive experience in biomass valorization, epoxy resin formulation, and lignin-derived monomer chemistry, with successful prototype synthesis already demonstrated.

Technology readiness level

Currently at TRL 3: the concept has been validated through literature review, laboratory-scale synthesis of initial prototypes using commercial aliphatic polyethers reacted with lignin-derived aromatic diols, and preliminary thermal and mechanical characterization. Next steps include optimization of barrier and thermal properties at laboratory scale, confirmation of final aliphatic polyether-to-aromatics ratios, and scale-up to kilogram quantities (TRL 4–6). This stage represents an opportunity for industry partners to collaborate on formulation refinement, application-specific testing, and pilot-scale validation in a relevant manufacturing environment.