Ethylene-tetrafluoroethylene (ETFE) cotelomer iodides and their transformation to surface protection intermediates

• The first study on synthesis of novel ETFE cotelomer iodides and their derivatives.
• The first study on cotelomerization of TFE and ethylene.
• A number of variables are evaluated in detail for the cotelomerization.
• ETFE cotelomer iodides were crystalline solids and its crystal data is presented.
• ETFE cotelomer derivatives are expected to have improved environmental profiles.

A new class of fluorotelomers was synthesized via the cotelomerization of ethylene and tetrafluoroethylene (TFE) with 1H,1H,2H,2H-perfluoroalkyl iodides. The telomerization led to ethylene-tetrafluoroethylene (ETFE) cotelomer iodides with the incorporation of ethylene and TFE in the cotelomer chain in an alternating fashion. By controlling the reaction parameters such as total pressure, temperature, feed ratio of the monomers, initiator feed, and conversion rate, eight-carbon cotelomer iodide or higher cotelomers could be produced preferably. The ETFE cotelomer iodides were transformed to a variety of intermediates such as alcohols, azides, amines and thiols, precursors useful to make surface modification agents.

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