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Abstract Microwave spectra of trans-ethylmethylether and its four deuterated species in the ground and four lowest torsionally excited states were measured. The coupling effects among two methyl and skeletal torsions were analyzed.

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