Ionic liquid functionalized polylactides: the effect of anions on catalytic activity and carbon nanotube dispersion. Issue 3 (16th January 2023)

• Record Type: Journal Article
• Authors: Fang, Dawei; Wen, Jingyi; Yu, Hao; Zhang, Jince; You, Xiaolei; Liu, Na
• Is Part Of: Materials advances. Volume 4:Issue 3(2023)
• Page Start: 948
• Page End: 953
• Publication Date: 2023-01-16
• Subjects: 620.11
• DOI: 10.1039/d2ma01008a
• Languages: English
• ISSNs: 2633-5409

Abstract

Abstract : A series of novel polylactides bearing an imidazolium group with different anions at one chain extremity were synthesized via ROP of lactide by organocatalysts. The effect of anions was systematically investigated for the first time. Abstract : Some hydroxylated imidazolium-based ionic liquids with different anions ([ILs-OH] + [X] − ) were synthesized using an anion exchange reaction. A series of novel polylactides bearing an imidazolium group with different anions (PLLA-ILs[X] − ) at one chain extremity were synthesized at 25 °C by ring-opening of l -lactide, which was initiated by the hydroxylated imidazolium-based ILs ([ILs-OH] + [X] − ) in the presence of organocatalysts. Nuclear magnetic resonance (NMR) and matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS) confirmed the structures of the PLLA-ILs[X] − . The results showed that the hydroxylated ionic liquid is an efficient initiator for the ring-opening polymerization (ROP) of l -lactide. Carbon nanotubes (CNTs) were dispersed in a solution of PLLA-ILs[X] − in 1, 4-dioxane and a significant improvement in the stability of suspension was observed by measurements of suspension absorbance. The absorbance of suspension between CNTs and PLLA-ILs[X] − followed the order: [TFSI] − > [H2 PO4 ] − > [Cl] − > [NO3 ] −, and was much higher than that of untreated CNTs, indicating that the anions have an obvious effect on the interaction between CNTs and PLLA-ILs[X] − . In the scanning electron microscopy (SEM) images, it was also clearly visible that the globular aggregates of PLLA-IL[Cl] − were bound to CNTs, which was consistent with the results of absorbance.