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SUMMARY:Stretching of Polydomain and Monodomain Nematic Elastomers: Experi
 mental Study - Urayama\, K (Kyoto Institute of Technology)
DTSTART:20130626T134500Z
DTEND:20130626T143000Z
UID:TALK45923@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:We review our experimental studies on the stretching driven di
 rector-rotation of polydomain nematic elastomers (PNEs) and monodomain NEs
  (MNEs). The texture of PNEs primarily depends on the preparation state\, 
 i.e.\, whether the cross-links are introduced in the high-temperature isot
 ropic or low-temperature nematic state. The director in the isotropic-gene
 sis PNEs can be rotated at unusually low energy cost by external fields. A
 s a result\, the isotropic-genesis PNEs can be largely deformed at small t
 ensile force and moderate electric field strength. In contrast\, the nemat
 ic genesis PNEs do not show such soft response due to the memory of the in
 itial random director configuration. We observe the remanent of the initia
 l director configuration even in the highly stretched state. The formation
  of stripe patterns has been known as a typical phenomenon of mechanical i
 nstability for the MNEs stretched normally to the initial global director.
  We introduce a different type of mechanical instability observed in our r
 ecent experiments for monodomain NEs.\n
LOCATION:Centre for Mathematical Sciences\, Meeting Room 2
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