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We investigate the effects of entanglement on polymer crystallization using atomistic molecular dynamics simulations of linear and cyclic polyethylene (PE). While linear chains entangle with their neighbors, unlinked rings adopt compact conformations and do not exhibit conventional entanglements. By isotropically compressing linear chains, we also systematically reduce the entanglement density in PE melts without enhancing any local order that may promote crystallization. After demonstrating tha

A diagram depicting a U.S. map of industrial plants that pollute greenhouse gases and toxic emissions into the air, including the manufacturers AEC in Petersburg, Indiana, Alcoa in Newburgh, Indiana and the American Electric Power company in Rockport, Indiana.