Abstract
Composite catalyst of heteropolyacid ammonium salt, (NH4)3PW12O40, and SiO2 was prepared by sol–gel method. The resultant catalyst ((NH4)3PW12O40-SiO2, 3.38wt%) having W/Si molar ratio of 2/8 enabled to proceed ring-opening polymerizations of tetrahydrofuran (THF), e-caprolactone (CL), and glycidyl phenyl ether (GPE) to give the corresponding poly(THF), poly(CL), and poly(GPE) having number-average molecular weights (Mn) of 6610, 4010, and 2370 with polydispersity index (Mw/Mn) of 1.57, 1.36, and 1.49 in 24%, 88%, and 59% yields, respectively. Matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF MS) spectra of poly(CL) and poly(GPE) exhibited that Bronsted acid induced from (NH4)3PW12O40-SiO2 is the only one species that initiates the polymerization.
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