Abstract
We report an efficient and environmentally friendly heterogeneous catalyst for β-pinene cationic polymerization based on silica supported phosphotungstic acid (HPW/SiO2). The catalysts were prepared and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature programmed desorption of ammonia (NH3-TPD) and FT-IR spectra. XRD and TEM analysis of HPW/SiO2 indicate that the particles of HPW are amorphously uniformly distributed on the surface of the silica. NH3-TPD results indicate that the total acid amount and acidity increased with increasing the loading amount. FT-IR spectra analysis shows that the structure of Keggin does not change when HPW was supported on silica. Their catalytic performance for β-pinene polymerization was also tested. Under the optimal conditions, the yield of poly(β-pinene)s was up to 90.4 %, and the number-average molecular weight was about 1,100.
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This work was supported by the Guangxi Natural Science Foundation (2010GXNSFD013015).
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Liu, Z., Cao, S., Wang, S. et al. Silica-supported phosphotungstic acid as a novel heterogeneous catalyst for β-pinene polymerization. Reac Kinet Mech Cat 111, 577–590 (2014). https://doi.org/10.1007/s11144-013-0657-z
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DOI: https://doi.org/10.1007/s11144-013-0657-z