Characterization of Shape Memory Polymer Estane by Means of Dynamic Mechanical Thermal Analysis Technique

Abstract

Commercially available shape memory polymer (SMP) Estane (designation: ETE75DT3 NAT022) is investigated by means of dynamic mechanical thermal analysis (DMTA) technique in torsion mode using the Modular Compact Rheometer MCR-301 (Anton Paar GmbH). Amplitude sweep tests have been run below and above the glass transition temperature to establish the linear viscoelastic range (LVR) in glassy and rubbery phase of this SMP for the correct physical interpretation of DMTA data. Temperature sweep tests were performed at various frequencies to study the influence of this parameter on values of the storage and loss moduli and the storage and loss compliances as well as the viscosities. These tests have been carried out in heating mode with different rates and at different strain amplitudes. The short-and long-term behavior of SMP Estane have been studied by frequency sweep tests performed at different temperatures and data have been transformed into time-domain properties by applying time-temperature superposition principles. All these DMTA data provide the experimental basis for the study of relaxation processes, propertystructure relationships, and the shape memory effect in this little-known SMP.

Modeling Based Characterization of Thermorheological Properties of Polyurethane ESTANE™

“…Below , the CTE is less pronounced which produces a kink in the -T curve. The discontinuity of linear thermal expansion, which we attribute to glass transition, is found at ≈ 55 ∘ C. This coincides with previously reported results in [27,30].…”

“…of SM-ESTANE was measured to be approximately 55 ∘ C, which is in agreement with previously reported results [30]. Interestingly, the temperature sweep tests of SM-ESTANE scanned at different frequencies indicates that the reduction of is less pronounced at higher frequencies than at lower ones.…”

Unraveling the impact of phase separation induced by thermal annealing on shape memory effect of polyester‐based thermoplastic polyurethane

“…However, most DMA equipment can control only the strain under programming, while tensile‐testing machine not always possess a temperature‐controlled chamber. In this way, some authors have already performed the SME measurement by using a rotational rheometer, 40–42 as this equipment is more versatile of conventional DMA, combining high control of stress and strain, deformation and temperature, which permits the characterization in both solid and molten states. Li, M. et al presented the evaluation of SME of semicrystalline polyamides using a commercial rotational rheometer in torsion mode 41 .…”

Toughness-based recovery efficiency of shape memory parts fabricated using material extrusion 3D printing technique

“…In addition, some SMP functionalities and properties have been reported in the literature. In that matter, testing results include shape-fixity ratio, long-term shape fixity ratio, recovery ratio, irrecoverable strain, tensile stress curves, Young’s modulus and storage and loss moduli (Schmidt et al , 2011; Wu et al , 2013b; Tobushi et al , 2008; Reddy et al , 2007; Kazakevičiu-tė-Makovska et al , 2014).…”