Programming of macro/micro scale information on shape memorizing polyvinyl acetate film

Abstract

The shape memory behavior of polyvinyl acetate (PVAc), both at macroscale and microscale, is presented. PVAc films exhibited excellent efficiency in programming macroscale deformation. Cyclic tensile tests on PVAc films revealed the importance of molecular weight in programming macroscale deformation in film. PVAc film with the highest molecular weight (∼228 kDa) exhibited maximum durability in programming macroscale deformation. This gives an important insight to the discovery of new shape memory polymers since chain entanglements in high molecular weight glassy polymers can impart shape memory behavior. In addition, such shape memory behavior can be exploited to imprint and tune microscale patterns on the film. Microprismatic patterns were embossed and programmed on shape memorizing PVAc films. Two different test methodologies were used to study the programmability of patterns on PVAc films. Pattern programming was significantly affected by the method used. In both cases, recovery time and temperature were two important parameters to determine the efficiency of programming. In addition, optical properties of PVAc films could be switched between reflective and transparent by programming patterns on the surface of the film. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44659.

Hot Embossing of Micro-Pyramids into Thermoset Thiol-Ene Film

“…The by far most popular was Tecoflex amorphous elastomer, which was patterned with the aim to create surfaces with switchable adhesion [ 15 ], to investigate recovery of micro- and nanostructures [ 16 , 17 ], to produce diffractive optical elements [ 18 ] and disordered gratings [ 19 ], to fabricate microstructured self-demolding molds [ 20 ]‚ etc. Other examples of thermoplastic SMP texturing involve embossing of microprismatic patterns on polyvinyl acetate films, fabrication of micro-optical components via compression molding of poly(ethylene-co-vinyl acetate), microprism/microlens embossing on the surface of polyvinyl acetate/polyurethane multilayer films and nanoimprint of the permanent micro- and nanometer-scale surface textures into Nafion film [ 21 , 22 , 23 , 24 ].…”

Electromechanical deformation and failure of multilayered films

“…1,9 The forced assembly multilayer coextrusion process enables many polymeric systems having unique architectures to be produced including multilayer films, 10 cellular film/foam materials, [11][12][13][14] and fibrous membrane systems. 9,[15][16][17][18] In addition, there has been numerous studies on the multilayered coextruded polymer systems directed toward applications including gas barrier films, 8,19 optical films, 20 shape memory films, [21][22][23][24] packaging film/foams, 25 fibrous membranes for filtration, 18,26 antibacterial membranes, 27,28 cellular membranes having through pores 12 and multilayer films with unique dielectric properties. [29][30][31][32][33][34][35][36] These investigations have emphasized the importance of scale within the multilayer films relative to enhanced performance characteristics.…”

Application and Development of Shape Memory Micro/Nano Patterns

“…In addition, scientists have made a similar polyvinyl alcohol film which has the ability to change the optical properties and make the logo reversibly converted between transparent and opaque. [ 139 ] The light‐responsive SMP micropillars array made by mixing gold nanorods (AuNRs) in SMP has a recovery time of only 5s. [ 34 ]…”

“…In addition, scientists have made a similar polyvinyl alcohol film which has the ability to change the optical properties and make the logo reversibly converted between transparent and opaque. [139] The light-responsive SMP micropillars array made by mixing gold nanorods (AuNRs) in has a recovery time of only 5s. [34] In addition, Li et al [63] fabricated a thermally driven beam splitter based on a shape memory polystyrene film with programmable micro/nanopatterns.…”