02396nas a2200241   4500008004100000022001400041245011200055210006900167260005700236300001200293490000700305520154300312100002201855700001801877700001901895700001801914700001801932700002201950700001801972700002101990700002102011856012202032       2014                        eng d  a0022-246100aMulti-walled CNT-induced phase behaviour of poly(vinylidene fluoride) and its electro-mechanical properties0 aMultiwalled CNTinduced phase behaviour of polyvinylidene fluorid  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcJAN  a103-1130 v493 a<p>A simple two-step process was used to disperse acid functionalizedmulti-walled carbon nanotubes (CNTs) in poly(vinylidene fluoride) (PVDF). While the neat solvent-cast PVDF showed coexistence of alpha- and beta-phases; the composite films exhibited only beta-phase crystals. Further studies on the crystalline behaviour, using differential scanning calorimetry and small-angle X-ray scattering techniques showed an increase in the percentage of crystalline phase with CNT. The network formed by CNTs in the matrix reduced the macroscopic electrical resistivity of composite films. The dielectric constant increased with CNT loading. Further, these composites were investigated for its electromagnetic wave absorbance (EWA) and strain sensing properties. The EWA properties were studied in the X-band (6-12 GHz) region. A maximum of similar to 37 dB reflectivity loss at similar to 9.0 GHz was obtained in a similar to 25 mu m thick PVDF film containing only 0.25 wt% of functionalized CNT. Preliminary studies showed a systematic change in electrical resistance by the application of dynamic bending strain in nanocomposite film. The film also showed a significant improvement in mechanical stiffness owing to efficient stress transfer from matrix to filler, the property desirable for a good strain sensor. In view of the unique combination of EWA and electro-mechanical properties, the nanocomposite films are expected to serve as a multifunctional material for strain sensing in health monitoring as well as in radar absorption.</p>1 aRath, Sangram, K.1 aDubey, Sachin1 aKumar, Sudheer1 aKumar, Sanjay1 aPatra, A., K.1 aBahadur, Jitendra1 aSingh, A., K.1 aHarikrishnan, G.1 aPatro, Umasankar  uhttps://library.ncl.res.in/content/multi-walled-cnt-induced-phase-behaviour-polyvinylidene-fluoride-and-its-electro-0