Hyperbranched Poly(propylene oxide): A Multifunctional Backbone-Thermoresponsive Polyether Polyol Copolymer

Abstract

Backbone-thermoresponsive hyperbranched poly-(propylene oxide)-based polyether polyols have been synthesized by anionic ring-opening copolymerization of glycidol and propylene oxide. The number of functional hydroxyl end groups and the lower critical solution temperature (LCST) can be readily adjusted by varying the comonomer ratio. Molecular weights in the range of 1200−2000 g/mol were achieved. Hyperbranched polyether polyols with LCST values between 24 and 83 °C can be obtained in a convenient one-step reaction.

Controlled Synthesis of Multi‐Arm Star Polyether–Polycarbonate Polyols Based on Propylene Oxide and CO2

“…Multifunctional, hb PPO copolymers with varied glycerol content and consequently varied number of glycerol‐branching points and end groups have been used to synthesize PPC multi‐arm star copolymers. The polyether–polyol samples were prepared by one‐pot synthesis via random copolymerization of PO and glycidol (anionic ring‐opening multibranching polymerization), using partially deprotonated trimethylolpropane as a trifunctional initiator according to a recently published procedure . As listed in Table , two different hb PPO copolymers, namely hb ‐PG 0.17 ‐ co ‐PPO 0.83 and hb ‐PG 0.39 ‐ co ‐PPO 0.61 (listed as samples 1 and 5 in Table ), have been prepared and used as multifunctional initiators, containing 17 and 39 mol% glycerol units, respectively.…”

Backbone‐Based LCST‐Type Hyperbranched Poly(oligo(ethylene glycol)) with CO2‐Reversible Iminoboronate Linkers

“…[1][2][3][4][5] For this purpose, controlled copolymerization of OEG-based acrylic esters with other stimuli-responsive monomers and various block, graft, or hyperbranched polymers of poly(ethylene glycol) have been carried out to tune their thermo-responsive behaviors. [10][11][12] Obviously, hyperbranched poly(ethylene glycol) (hPEGs) have several superiorities contrasted to the linear polyethers for use in controlled delivery system due to their globule shapes with abundant terminal functional groups and programmable internal cavities available to encapsulate guest molecules. [12,13] hPEGs can be prepared via two different strategies.…”

“…[10][11][12] Obviously, hyperbranched poly(ethylene glycol) (hPEGs) have several superiorities contrasted to the linear polyethers for use in controlled delivery system due to their globule shapes with abundant terminal functional groups and programmable internal cavities available to encapsulate guest molecules. [12,13] hPEGs can be prepared via two different strategies. One is the grafting of OEG chains onto the structure of a dendrimer or hyperbranched polymer.…”

Hyperbranched aliphatic polyether polyols

“…57,[59][60][61][62] To systematically lower the DB, the branching monomer can be copolymerized with a linear comonomer. [62][63][64][65] The implications of this approach will be discussed later in this article.…”

“…65 PPO as traditional water-insoluble polyether was modified by anionic copolymerization of PO with a minor fraction of glycidol (Fig. 21).…”