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POLYMERISATION METHOD BY OPENING OXYGENATED CYCLES using a catalytic composition based on a grafted metal oxide
POLYMERISATION METHOD BY OPENING OXYGENATED CYCLES using a catalytic composition based on a grafted metal oxide
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机译:通过使用基于接枝金属氧化物的催化组合物打开氧合循环的聚合方法
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摘要
The invention relates to a composition based on a grafted metal oxide, its preparation and its use in a process of polymerization by opening oxygenated rings such as alkyl oxides, cyclic esters or cyclic carbonates. The composition comprises a support chosen from the group of metal oxides capable of containing hydroxyl functions, onto which is grafted a group of formula (1) -M(OR)n in which M is an element chosen from scandium, zirconium, hafnium, niobium, tantalum, rare-earth metals and actinides, R is an organic group and n is an integer greater than or equal to 1. The composition is prepared by forming a suspension of the abovementioned support and then placing in contact and reacting this suspension with a compound of formula (2) M(OR)n+1 in which M, R and n are defined as above.
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