Intrinsic Permanent Shape Reconfigurable Semicrystalline Biopolyester Thermoset

Area of Science:

• Polymer Chemistry
• Sustainable Materials Science

Background:

• Biobased polyesters offer sustainability but are limited to static applications due to rigid 3D networks.
• Existing dynamic polymers often require catalysts or specific chemical modifications for reconfigurability.

Purpose of the Study:

• To develop a sustainable, cross-linked polymer with intrinsic shape reconfigurability.
• To demonstrate the potential of this material in shape-memory applications without additional chemical steps.

Main Methods:

• Synthesis of poly(1,8-octanediol-co-1,12-docanedioate-co-citrate) (PODDC) via catalyst-free and VOC-free polyesterification.
• Investigating the dynamic, exchangeable bonds within the cross-linked semicrystalline network.
• Utilizing annealing above the melting-transition temperature (Tm) for shape reconfiguration.

Main Results:

• PODDC exhibits permanent shape reconfigurability up to nine times through annealing.
• The material's reconfigurability is achieved without reagents, from synthesis to reshaping.
• Demonstrated potential as a smart shape-memory polymer (SMP) with flexible shape design.

Conclusions:

• Intrinsic dynamic bonds in PODDC enable sustainable, reagent-free shape reconfigurability.
• This material offers multifaceted sustainability, including hydrolytic degradation after use.
• Potential applications include soft robots and shape-morphing devices with reduced environmental impact.