top

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

In 1985, 2477 new members were elected. The top sponsors, AGU members sponsoring three or more new members, are listed below33 Members: A. Ivan Johnson.

Story collected by Mary Gleeson, a student at Mullinahone (C.) school (Mullinahone, Co. Tipperary) (no informant identified).

Thales is a national partner with Primary Engineer, an educational not-for-profit organisation that collaborates with engineering and technology professionals to inspire children with STEM through fully funded programmes and competitions.

Photo realistic Window top 100K triangles Reality Capture. Higher reslolution textures could be possible along with higher density triangle mesh. Source: Objaverse 1.0 / Sketchfab

We apply molecular dynamics simulations to quantify the effects of free surfaces and interfacial regions on crystallization in freestanding and bilayer polymer films. We show that enhanced crystal nucleation in polymer thin films is quantitatively correlated to faster local segmental dynamics induced by free surfaces. When a second layer is deposited onto a semicrystalline film, we observe rapid primary nucleation near the free surface, secondary nucleation near the semicrystalline interface, an

Abstract Nfkbid Overexpression Inhibits Type 1 Diabetes See article p. 227 Lipid Mediators Associated with Severe COVID-19 See article p. 250 Epigenetic Protection from SIV Pathology See article p. 337 Macrophages Need MAVS to Fight Mold See article p. 346