Building Ultrastrong, Tough and Biodegradable Thermoplastic Elastomers from Multiblock Copolyesters Via a...

Area of Science:

• Materials Science
• Polymer Chemistry

Background:

• Achieving high strength and toughness simultaneously in thermoplastic elastomers, particularly biodegradable ones, remains a significant design challenge.
• Existing biodegradable elastomers often compromise mechanical properties for degradability or vice versa.

Purpose of the Study:

• To develop a class of biodegradable elastomers with superior strength, toughness, and resilience.
• To explore a novel "reserve-release" crystallization strategy for enhancing mechanical properties.
• To demonstrate the tunability of mechanical responses through controlled polymer architecture.

Main Methods:

• Synthesis of multiblock copolyesters incorporating semi-crystalline soft blocks.
• Controlled variation of block periodicity, segment lengths, and ratios.
• Characterization of material properties including strength, toughness, and crystallization behavior under strain.

Main Results:

• Extraordinary strength, toughness, and low-strain resilience were achieved in the biodegradable elastomers.
• The "reserve-release" crystallization strategy, involving low quiescent and high strain-induced crystallization, significantly enhanced mechanical performance.
• Tunable mechanical properties, including reinforced elastomers, shape-memory materials, and toughened thermoplastics, were realized by adjusting block compositions.

Conclusions:

• The double crystalline multiblock chain architecture offers a promising approach to overcome the strength-toughness trade-off in thermoplastic elastomers.
• The "reserve-release" crystallization strategy provides a pathway to design high-performance biodegradable materials.
• This approach can be extended to other biodegradable building blocks for diverse functional material applications.