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BEGIN:VEVENT
DTSTAMP:20260904T134801Z
DTSTART;VALUE=DATE-TIME:20180205T130000
DTEND;VALUE=DATE-TIME:20180205T140000
SUMMARY:Nigel Clarke (Sheffield)
TZID:Europe/London
UID:20180205-8a17841a6012ba7a01606a701dfa6093@warwick.ac.uk
CREATED:20171218T162340Z
DESCRIPTION:Unusual dynamic processes in polymer nanocomposites With nano
 particles being increasingly used as additives to polymers to impart enh
 anced mechanical and functional properties\, we aim to develop an unders
 tanding of how polymer nanocomposite processing by exploring how nanopar
 ticles impact on polymer dynamics. In high molecular weight polymer melt
 s\, chain diffusion is well described by the reptation model. Motion pro
 ceeds as a snake-like diffusion of the chain as a whole\, along the cont
 our of a tube that mimics the role of physical entanglements\, or topolo
 gical constraints\, with other chains. In polymer nanocomposites\, there
  are additional constraints due to the dispersed nanoparticles in the po
 lymer matrix. Chain motion can be altered by nanoparticle size\, shape \
 , aspect ratio\, surface area\, loading and the nature of the interactio
 ns between the nanoparticles and the polymer matrix. As a consequence\, 
 unusual phenomena are associated with the dynamics of nanocomposites\, F
 or example\, we have observed a minimum in the diffusion coefficient as 
 a function of nanoparticle concentration when the nanoparticles are rod-
 like and a collapse of the diffusion coefficient onto a master curve whe
 n the nanoparticles are spherical. We are simulating the dynamics using 
 molecular and dissipative particle simulations in order to provide physi
 cal insight into the local structure and dynamics\, and have also carrie
 d out highly coarse grained Monte Carlo simulations of entangled polymer
 s to explore how reptation is affected by the presence of larger scale o
 bstacles.
LOCATION:Physical Sciences (PS0.17)
CATEGORIES:
LAST-MODIFIED:20180111T100220Z
ORGANIZER;CN=Peter Brommer:
END:VEVENT
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