Acyclic Diene Metathesis (ADMET) uses metathesis of terminal dienes to produce linear polymers and ethylene. Because ADMET is actually a variation on cross-metathesis, the process is reversible, and ethylene must be removed to drive the polymerization to completion. The polymers grow by step-growth kinetics (in contrast to the chain propagation kinetics of ROMP), so high-purity monomers are often necessary to achieve high molecular weight polymer. ADMET reactions are typically conducted highly concentrated or in neat monomer, both to help drive the polymerization equilibrium and to limit the formation of undesired cyclic oligomers by ring-closing metathesis mechanisms (“backbiting”).
ADMET polymerization has been used to generate a wide range of polymers with very specific structure – if the α,ω-olefin monomer can be synthesized, it can be converted into a strictly linear polymer with precise control of backbone functionalities. The Wagener group in particular has developed ADMET methodology to explore systems as diverse as the effects of branching on polyethylene properties, to the polymerization of chiral monomers.
 Baughman TW, Wagener KB, “Recent Advances in ADMET polymerization,” Adv. Polym. Sci., 176, 2005, p1.
 Church AC, Smith JA, Pawlow JH, Wagener KB, “Nontraditional Step-growth polymerization: ADMET,” page 431 in Synthetic Methods in Step-growth Polymers by Rogers ME and Long TE, Wiley-Interscience, 2003.