Thermoplastic silicone elastomers from divanillin crosslinkers in a catalyst-free process

Abstract

Silicone elastomers are typically thermosets that are difficult to recycle or repurpose. Thermoplastic silicone elastomers formed from Schiff bases utilize crosslinkers based on petroleum. Vanillin is an aromatic phenolic aldehyde...

Recent advances on the structure–properties relationship of multiblock copolymers

“…A-blocks most often refer to apolar "soft" segments (SSs) made of a low-T g polymer such as polybutadiene (PB), [2][3][4] polyisoprene (PI), [5][6][7][8][9] polyethylene oxide (PEO), 10,11 polyethylene (PE), 12,13 polypropylene (PP), 14 polydimethylsiloxane (PDMS), 15,16 poly-1-octene, 17 or the popular polytetrahydrofuran (PTHF), [18][19][20][21][22][23][24][25][26][27][28] providing the material with its flexibility. While some of the aforementioned SS have the possibility to crystallize (e.g., above 2 kg mol À1 for PTHF), they are mostly amorphous at service temperature and at rest.…”

Antioxidant Silicone Elastomers without Covalent Cross-Links

“…A 2-year-old sample was cut into pieces, heat processed under pressure, sequentially five times with only a nominal change in Shore hardness from 42 to 36 (Figure S6). Thermal processing led to darker elastomers, presumably due to oxidative processes. ,,− …”

“…Gemini interactions between silicone dicarboxylic acids and silicone diamines led to robust materials, until about 80 °C was reached, at which point they became processable fluids that upon cooling regained their elastomeric properties . An alternative strategy exploits dynamic imine bonds that, in the presence of small quantities of amine or aldehyde, lead to elastomers that are thermoplastic and self-healing at room temperature but completely dissolve in the presence of excess monoamines. , Most of these examples take advantage of the wide availability of aminoalkylsilicones (the terminology “aminosilicones” will be used to reflect telechelic or pendent aminoalkylsilicones).…”

Herbaceous plants-derived hydroxycinnamic units for constructing recyclable and controllable copolyesters

“…[30][31][32][33] Historically, most polymers from lignin-derivable compounds dealt with vanillin and vanillic acid, the monomeric phenols that could be generated from the oxidative depolymerization of soft tree lignin. [34][35][36][37][38][39][40] Recent progress on the controllable depolymerization of lignin has paved the way for preparing aromatic monomers and polymers in a sustainable manner. [41][42][43][44][45] Yan illustrated that TPA could be synthesized from corn stover lignin-derived monomers through a three-step strategy.…”