Bio‐Based, Recyclable and Self‐Healing Polyurethane Composites with High Energy Dissipation and Shape Memory

Abstract

Rubber composites make an important contribution to eliminating vibration and noise owing to their unique viscoelasticity. However, it is important to find alternative bio-based products with high damping properties owing to the shortage of petrochemical resources and poor performance. The ability to self-heal is an additional characteristic that is highly desirable because it can further increase the service life and safety of such products. In this study, a bio-based polylactic acid thermoplastic polyurethane (PLA-TPU) and its composites (PLA-TPU/AO-80) are synthesized. The reversible sacrificial hydrogen bonds in the composites increase the peak value of the loss factor (tan 𝜹 max ) from 0.87 to 2.12 with a high energy dissipation efficiency of 99% at 50% strain. After being heated for 15 min, the healed sample recovers 81.98% of its comprehensive mechanical properties due to the reorganization of the hydrogen bonds. Its tensile strength remains at 93.4% after recycling five times. Moreover, its shape memory properties show a response temperature close to the human body temperature making it an ideal candidate for medical applications.

Progress in Photocurable 3D Printing of Photosensitive Polyurethane: A Review

“…Polyurethane (PU), a high‐molecular polymer, is acquired by the reaction of polyols, polyisocyanates, and diols/diamines. [ 44 ] The molecular chain of PU is mainly composed of urethane groups (NHCOO) and urea groups (NHCONH), which endow the PU with excellent performance, such as elasticity, impact resistance, abrasion resistance, etc. Furthermore, these superior performances are also associated with variations of oligomeric polyols and polyisocyanates in molecular chains.…”

Chemically Recyclable Biobased Non‐Isocyanate Polyurethane Networks from CO2‐Derived Six‐membered Cyclic Carbonates

“…These valuable monomers can be used to prepare virgin materials or other functional materials. [16][17][18][19] Liu et al [9] prepared a series of biobased NIPU networks by the reaction of cyclic-carbonated soybean oil and amines. The crosslinked NIPU networks could be depolymerized into oligomers through the exchange reaction between ester bonds and hydroxyls.…”

“…These valuable monomers can be used to prepare virgin materials or other functional materials. [ 16–19 ] Liu et al. [ 9 ] prepared a series of biobased NIPU networks by the reaction of cyclic‐carbonated soybean oil and amines.…”

Formation of Interpenetrating-Phase Composites Based on the Combined Effects of Open-Cell PIF and Porous TPU Microstructures for Enhanced Mechanical and Acoustical Characteristics

“…As a common damping elastomer, thermoplastic polyurethane (TPU) is widely used in vibration reduction and underwater sound absorption. 40,41 However, the application of TPU in air sound absorption is limited by its impermeability. Therefore, porous TPU microstructures can be constructed in PIF pores with moderate opening degrees to combine multiple sound absorption mechanisms for enhancing sound energy dissipation.…”