Fully Biobased Vitrimers from Glycyrrhizic Acid and Soybean Oil for Self-Healing, Shape Memory, Weldable, and Recyclable Materials

Abstract

Vitrimers are covalent polymer networks that can change their topology through thermally activated bond exchange reactions. In this work fully biobased and recyclable vitrimers were developed from epoxidised soybean oil (ESO) and natural glycyrrhizic acid (GL) as it was without additional chemical modification, which avoided the use of nonrenewable petroleum resources and resolved the disposal problems of materials. Due to the unique rigid skeleton of GL, ESO/GL vitrimers showed good thermal stability and mechanical properties. Driven by the transesterification-induced topological network rearrangements, these ESO/GL vitrimers exhibited high performance of welding, repairing and shape memory. They were also recyclable and chemically degradable by ethylene glycol. More importantly, these vitrimers could be used as repairable and recyclable adhesives.

Reprocessable, Reworkable, and Mechanochromic Polyhexahydrotriazine Thermoset with Multiple Stimulus Responsiveness

“…through the reversible depolymerization or exchange reactions of their dynamic cross-links [ 3 , 9 , 10 , 11 ]. So far, a number of CANs based on Michael addition [ 12 , 13 , 14 ], Diels-Alder reaction [ 15 , 16 ], disulfide exchange [ 17 , 18 , 19 ], imine metathesis [ 20 , 21 , 22 ], transesterification [ 23 , 24 , 25 ], olefin metathesis [ 26 , 27 ], silyl ether transalkoxylation [ 28 , 29 ], diketoenamine exchange [ 30 , 31 ], and dioxaborolane metathesis [ 32 , 33 ] have been proposed in the literature. Besides recyclability, many other adaptive properties of CANs were also investigated, such as reconfigurability [ 34 , 35 ], shape memory [ 36 , 37 ], and network topological transformation [ 18 , 25 , 38 ].…”

Renewable and recyclable covalent adaptable networks based on bio-derived lipoic acid

“…However, the implementation of sustainable feedstocks is also needed in order to transition from petroleum-derived platform chemicals that have dominated the modern materials economy, including research in the CAN material space. 8 Progress on this front has relied on the derivatisation of bio-derived chemicals to enable dynamic bonding with the most common examples of bioderived CAN materials featuring imine [9][10][11][12][13][14][15][16] and epoxy [17][18][19][20][21][22][23] chemistries. On the other hand, the use of a renewably sourced monomer that possesses inherent dynamic functionality is a more attractive feature for next-generation CAN materials since synthetic costs could be mitigated and overall sustainability improved.…”

Rubber Seed Oil-Based UV-Curable Polyurethane Acrylate Resins for Digital Light Processing (DLP) 3D Printing

“…Besides, petrochemical products are non-renewable, which causes more pressure on environmental supervision [ 4 ]. For the purposes of reducing the consumption of fossil feedstock and endowing materials with biocompatible and biodegradable properties, various resources of renewable building blocks [ 5 , 6 , 7 ], including plant oil [ 8 , 9 , 10 , 11 ], natural phenolic [ 12 , 13 , 14 , 15 , 16 , 17 ], natural acid [ 2 , 18 , 19 , 20 , 21 ], and so forth [ 1 , 22 , 23 , 24 ], have been employed as starting materials to prepare UV-curable materials [ 25 ].…”