Smart Polymeric Foams Based on LDPE/EVA/MWCNT Nanocomposite:Correlation Between Micromorphology and Shape Memory Behavior

In the present work, smart shape memory polymer (SMP) foams were produced via melt-compressionmolding based on crosslinked blends of low-density polyethylene (LDPE) and ethylene-vinyl acetate(EVA) copolymer containing multi-wall carbon nanotube (MWCNT). For this purpose, blendcompounds with various phase ratios and corrosponding nanocomposites with differentconcentrations from MWCNT (1.5, 2.5 and 4 phr) were prepared via melt-mixing process. Thepresence of MWCNT nano particles led to significant increase of cell density and decrease on cellsize in both LDPE-rich and EVA-rich generated foams, which revealed further micromorphologychanges in EVA-rich foams due to the more thermodynamically interest of carbon nanotubes andlocalization in EVA phase. Thermomechanical shape memory test exhibited a great shape memoryeffect (SME) obtained by 4 phr MWCNT in LDPE-rich foam (%Rr=98) and EVA-rich foam(%Rf=96), which depicts elastic cell walls with higher cell density made by formation of MWCNTphysical networks above percolation threshold could enhance shape fixity and shape recovery of SMPfoams.

کلیدواژه های Smart Polymeric Foams Based on LDPE/EVA/MWCNT Nanocomposite:Correlation Between Micromorphology and Shape Memory Behavior:

Foams ، Smart Polymers ، Shape Memory ، MWCNT ، EVA