Comparison of poly(ethylene glycol)-based networks obtained by cationic ring opening polymerization of neutral and 1,2,3-triazolium diepoxy monomers

Abstract

The properties of two cross-linked epoxy networks obtained by ring opening polymerization of a synthetic diepoxy 1,2,3-triazolium and a commercial poly(ethylene glycol)diglycidyl ether using benzylamine trifluoroborate as cationic initiator are compared.

Poly(ethylene glycol)-Based Poly(ionic liquid) Block Copolymers through 1,2,3-Triazole Click Reactions

“…The T g of TGME is well in line with what has been reported for similar 1,2,3-triazolium containing PILs (−28 to −50 °C). 14,15 The second T g increases from the homopolymer to block copolymer because of the additional poly(S) block (T g of pure poly(S) = 100 °C), which is miscible in the styrenic backbone of the poly(VB-Me-TGME-TFSI) block. The observation of two glass transition temperatures is also a sign of block copolymer microphase separation.…”

“…In contrast, block copolymers that are composed of cationic or anionic PILs and neutral block based on poly­(ethylene glycol) methyl ether methacrylate do not show any phase separation due to the miscibility of both blocks . Even weak phase separation of block copolymers, with no long-range order, have been observed to increase the ion conductivity by 2 orders of magnitude, compared to random copolymers. , The type of morphology also has an effect, as lamellar morphologies are known to have anisotropic conductivity while morphologies with three-dimensional networks form ion-conductive channels. , A strong tendency to phase separate due to the high degree of incompatibility of the blocks has been found to improve the ion transport properties of PIL block copolymers even more. , Second, the choice of comonomers has an effect: poly­(ethylene glycol) (PEG) moieties have low T g values, providing improved ion conductivity. − However, high-molecular-weight PEG tends to crystallize leading to a drop in ion conductivity at 25 °C, whereas short PEG units can be tacky and soft, preventing their incorporation into solid-state devices. Short PEG side chains have also been observed to increase the amount of charge carries and to have the ability to ionize salts in lithium-ion cells. , …”

Synthesis, Anticancer and Antibacterial Activity of Mannose-based bis-1,2,3-Triazole Derivatives

“…[23][24][25] Many factors improve the 1,2,3triazoles biological value such as physical and chemical properties, high stability against oxidant agent, hydrolysis resistant in acid/base conditions, the hydrogen bonds forming and amide bioisoesters. 26 As a result of the special physicochemical properties, 1,2,3-triazole derivatives played a versatile role in the material sciences, 27 Anti-corrosions, 28 polymers, 29 dyes, 30 catalysts, 31 ligands, 32 surfactants, 33 chemo sensors for different species. 34 Click strategies is the concept introduced by Sharpless 35 and Meldal 36 in 2002 to design and synthesize wide scope of 1,2,3triazoles scaffold molecules.…”

Divergent Synthesis of Biocompatible Nearly Monodisperse Multi‐Functional Poly(ethylene glycol) Periodic Copolymers

“…Copolymers of PEG (especially the linear, graft, and star copolymers) are generally prepared using ATRP, RAFT, and (anionic) ring opening copolymerization. [24][25][26][27] Anionic ROP of different functional epoxides (such as alkyl, tertiary amino) are well known in the context of the synthesis of the respective functional PEG with narrow dispersity. [28,29] Further secondary amine and ester groups in the PEG chains can be introduced via anionic ROP of aminal and ester-protected epoxides respectively and followed by a post-polymer deprotection.…”