Synthesis of imidazolium‐functionalized ionic polyurethane and formation of CdTe quantum dot–polyurethane nanocomposites

Abstract

A series of positively charged imidazolium-functionalized ionic polyurethanes (IPUs) were prepared in one-step polymerization process by polymerization of presynthesized short-chain imidazolium-based ionic diol, polyethylene glycols with different molecular weights as long-chain diols, and toluylene-2,4-diisocyanate. The structures of IPUs are confirmed by 1 H NMR analysis, and the thermogravimetric analysis measurement indicates that the IPUs have high degradation temperature. Fluorescent nanocrystal-polymer composites CdTe-IPU can be prepared conveniently, by the electrostatic interaction between positively charged IPUs and the negatively charged aqueous CdTe quantum dots (QDs). UV-vis absorption and photoluminescence spectra indicate the photochemical stability and strong fluorescent emission of CdTe-IPU composites. The quantum yields (QYs) of the composites are high and basically restore the QYs of the pure QDs. In addition, the transmission electron microscopy photographs show that the QDs in composites are uniform (about 3 nm in diameter) and monodisperse. The obtained nanocomposites are powder or elastomers with good film building. The casted CdTe-IPU films are transparent under visible light, and the colors of the composites and their films are vivid under a UV lamp. V C 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: 509-516, 2012

Prognostic significance of immunophenotypic and karyotypic features of Philadelphia positive B‐lymphoblastic leukemia in the era of tyrosine kinase inhibitors

“…However, only the third approach can afford a homopolymer having imidazolium units in the main chain, while the other two approaches just provide homopolymer or block copolymers with pendant imidazolium units. Additionally, in our previous work, the imidazolium‐functionalized ionic polyurethanes were synthesized by one‐step polymerization of presynthesized imidazolium‐based ionic diol, polyethylene glycols, and toluylene‐2,4‐diisocyanate 43…”

Polymerized ionic liquid block copolymers for electrochemical energy

“…[11][12][13][14][15][16][17] In fact in 2004, the rst PIL block copolymer was synthesized via NMP by Waymouth, Gast, and coworkers. [11][12][13][14][15][16][17] In fact in 2004, the rst PIL block copolymer was synthesized via NMP by Waymouth, Gast, and coworkers.…”

“…Table 1 lists various controlled polymerization techniques (e.g., NMP, RAFT, anionic, CMRP, ROMP, ATRP) that have recently been explored to prepare PIL block copolymers. 13,[15][16][17][18][19][20][21][22][23][24][25][26]28,29,[35][36][37][38][39][40][41][44][45][46][47] The former allows for facile molecular weight determination of the non-ionic precursor block copolymer with conventional techniques, such as gel permeation chromatography (GPC). 13,[15][16][17][18][19][20][21][22][23][24][25][26]28,29,[35][36][37][38][39][40][41]…”

Hierarchical nanostructures of tunable shapes through self-aggregation of POSS end-functional polymer and poly(ionic liquid) hybrids

“…POSS-PIL was prepared by the post-modification grafting of the pendent imidazole groups of POSS-PVim1 chain as shown in Scheme 1 [41]. Typically, POSS-PVim1 (50 mg) and 1-bromodecane (250 mL) were dissolved in 5 mL dry methanol in a 25 mL long neck RB flask, which was subsequently placed in an oil bath preheated at 60 C for 24 h. The resultant POSS-poly (1-vinyl, 3-decyl imidazolium bromide) (abbreviated as POSS-PDVim þ Br ‾ ) was purified by precipitation in excess diethyl ether and dried under vacuum at 60 C for 24 h. POSS-poly (1-vinyl, 3-butyl imidazolium bromide) (POSS-PBVim þ Br ‾ ) was also prepared under similar condition from POSS-PVim1 and 1-bromobutane.…”