Supersoft Norbornene-Based Thermoplastic Elastomers with High Strength and Upper Service Temperature

Area of Science:

• Polymer Science
• Materials Science
• Organic Chemistry

Background:

• Thermoplastic elastomers (TPEs) are widely used due to their elasticity and reprocessability.
• Current TPEs face limitations in balancing softness with strength and possess low upper service temperatures (≤100°C).
• These limitations restrict TPE applications in demanding fields like bio-interfacing, electronics, and aerospace.

Purpose of the Study:

• To develop novel TPEs that combine exceptional softness, high strength, and elevated thermal resistance.
• To address the unmet need for versatile TPEs suitable for high-performance and bio-interfacial applications.
• To establish structure-property relationships for guiding the design of next-generation TPEs.

Main Methods:

• De novo design and synthesis of novel norbornene-based ABA triblock copolymers.
• Utilized ring-opening metathesis polymerization (ROMP) for TPE synthesis.
• Characterized material properties including mechanical moduli, strength, and thermal stability.

Main Results:

• Achieved TPEs with skin-like moduli (<100 kPa) and strength competitive with commercial TPEs (>5 MPa).
• Demonstrated high upper service temperatures of approximately 260°C, suitable for high-performance plastics.
• Materials exhibited elasticity, toughness, reprocessability, and shelf stability without plasticizers.

Conclusions:

• Successfully synthesized novel TPEs overcoming the softness-strength-thermal resistance tradeoff.
• The developed TPEs offer a versatile solution for applications requiring both biological softness and thermomechanical durability.
• Identified structure-property relationships provide a foundation for future advancements in TPE material design.