No abstract

No abstract

No abstract

Substituted phosphotungstic acids containing manganese, chromium, molybdenum and vanadium were prepared, and their catalytic performance on cationic polymerization of β-pinene was also investigated. The experimental results show that the substituted phosphotungstic acids are mono-substituted and keep Keggin structure. The substituted phosphotungstic acids containing Mn or Cr exhibit similar catalytic performance as phosphotungstic acid, instead show bad properties if containing Mo or V. The yield of polymer is up to 44.3 %, and the average number molecular weight is about 1200, and molecular weight distribution index is 1.4.

Polymerization of β-pinene was investigated in the presence of various Keggin phosphotungstates. The experiments show that cetyltrimethylammonium phosphotungstate with molar ratio of cetyltrimethylammonium bromide to phosphotungstatic acid equal to 0.5 indicate efficient catalytic performance for the polymerization of β-pinene. The catalyst was easily removed from reaction mixture by filtration. Therefore, a clean and environmental friendly strategy for synthesis of terpene resin is developed.