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down to butenes are used to produce polyalpha-olefins such as polybutene. Polymerization can be catalyzed by boron trifluoride-based systems, i.e., Friedel-Crafts oligomerization, using alcohols as co-catalysts. The polymerization mechanism involves carbocations in contrast to the methods used for PE and PP. Because these poly-alpha-olefins have flexible alkyl groups on every other carbon of their backbone, they tend to be oily,

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