Oligomeric Branched Polyethers with Multiple Hydroxyl Groups by Cationic Ring‐Opening Polymerization for Inorganic Surface Modification

Abstract

Summary: Cationic ring-opening polymerization of cyclic ethers (also esters and acetals) substituted with hydroxyl groups leads to branched multihydroxyl polymers. When 4-membered hydroxysubstituted oxetanes or 5-membered hydroxysubstuituted oxolanes (or lactone and 1,3-dioxolane) are used as monomers the polymerization products have limited molecular weights (about 1000). Polymerization of these monomers leading in situ to oligomeric products was used for inorganic surface modification. Successful polymerizations of oxetane as well as considered as difficult to polymerize 5-membered hydroxysubstituted cyclic monomers initiated from montmorillonite clay and silica nanoparticles surfaces were performed.

Formation of linear and cyclic polyoxetanes in the cationic ring‐opening polymerization of 3‐allyloxymethyl‐3‐ethyloxetane and subsequent postpolymerization modification of poly(3‐allyloxymethyl‐3‐ethyloxetane)

“…Numerous applications of hyperbranched poly(EHO) have been found as the hydroxyl groups may serve as initiating sites for ring‐opening polymerization of a second monomer, leading to well‐designed copolymers. Contributions in the fields of controlled drug release,25 supramolecular self‐assembly,26 host–guest recognition,27 and inorganic surface modification28 have been described in the literature.…”

Ring‐Opening Polymerization of Cyclic Acetals: Strategy for both Recyclable and Degradable Materials

“…[44] 1,3-Dioxolane-4-methanol (DO ) and its six-membered isomer polymerized into branched polyacetals with numerous hydroxy end groups. [45,46] All attempts to homo-polymerize DO R having a substituent at the C 2 -atom, namely, 2-methyl-, 2-phenyl-, 2,4-dimethyl-and 2-methyl-4-chloromethyl-1,3-dioxolanes failed with initiators which were effective for DO, implying their intrinsical lack of polymerizability under the temperature explored for a thermodynamical reason. [47] The further decreased polymerizability of 2-substituted DO R s than 4-substituted ones can be explained by the scission exclusively at 2-positon of DO R during the CROP.…”