Abstract
A series of Keggin-type heteropolyacids (HPAs) have been explored for cationic polymerization of β-pinene in an attempt to substitute traditional polymerization catalyst Lewis acids. The catalysts were characterized by XRD, FT-IR, TGA, acid strengths of the catalysts were measured with Hammett indicators. Among them, 12-phosphotungstic acid (PW12) exhibits much higher catalytic activity. The effects of solvent, calcination temperature and reaction temperature on the catalytic performance were investigated.
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