Polymerization of tetrahydrofuran initiated by heteropolyacid in the presence of substituted oxirane

Abstract

Both propylene oxide and epichlorohydrin could effectively promote the polymerization of tetrahydrofuran initiated with a heteropolyacid, H3PW12O40, in low concentration. Water or butylene glycol was used to control the molecular weight of the product in the range of 1000–3000. The promotion activity of propylene oxide was similar to that of ethylene oxide and better than that of epichlorohydrin, especially when water was introduced. The polymerization started upon addition of propylene oxide or epichlorohydrin. After the polymerization stopped, it could be reinitiated with the addition of a new portion of propylene oxide or epichlorohydrin. The products were found to be copolyether glycol with hydroxyl groups at both ends. The melting point of the polymer obtained by using propylene oxide promoter was about 20°C lower than that of polytetramethylene ether glycol having the same molecular weight. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 3239–3246, 2000

Calcium Salts of Tungstophoric Acid Supported on Silica as Novel Catalysts for Tetrahydrofuran Polymerization

“…1. These characterizations were in accordance with the spectra of PTMG reported by Chen et al [31] and Schaefer et al [32].…”

Preparation of Polyether Triol and Three-Armed Polyether Triol by Tetrahydrofuran Polymerization Initiated with Heteropolyacid

“…The peaks for ECH moieties in Figure 3 were assigned as we reported in a previous paper [20] and the peaks of TMP moieties were assigned by using the spin-decoupling technique. The structure information is given in Table 3 and 4.…”

“…Thus the polyether chain will start with (1-chloromethyl) oxyethylene hydroxyl group [1OCH 2 CH (CH 2 Cl) OH], [20] which is much less reactive toward the transfer reaction of propagating chains.…”

β-Pinene cationic polymerization using Keggin heteropolyacid catalysts

“…In these reactions, the aimed catalysts acted as polymerization initiators, and the reaction mechanism was accepted commonly as cationic polymerization [13][14][15][16][17][18][19]. Burrington et al [20] have published on the use of a heteropolyacid salt as catalyst for the cationic polymerization of isobutylene.…”