Journal
POLYMER ENGINEERING AND SCIENCE
Volume 58, Issue 2, Pages 238-244Publisher
WILEY
DOI: 10.1002/pen.24567
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Funding
- Government of La Rioja
- Footwear Technology Center of La Rioja
- Basque Country Government (Ayudas para apoyar las actividades de los grupos de investigacion del sistema universitario vasco) [IT718-13 y ACTIMAT [ELKARTEK]]
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Shape-memory polyurethanes (SMPUs) represent a highly interesting class of materials due to their applications in different sectors such as biomedical, textile, and aerospace. Moreover, it is possible to synthesize a variety of polyurethanes with different molecular architectures just choosing properly the chemical structure of their components. In this work, it is described the influence of the soft segment on the thermomechanical properties and shape memory behavior of shape memory polyurethanes. The synthesis, based on two-step polymerization, was prepared by two different soft segments: poly(oxytetramethylene) glycol (PTMG) or poly(ethylene glycol) (PEG). Depending on the molecular architecture achieved, the materials present different properties that were studied by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Furthermore, the shape memory response of thermally activated SMPUs is determined qualitative and quantitatively by visually monitoring the shape recovery process and by thermomechanical analysis (TMA), respectively. All developed compositions have shown good shape memory behavior, with recovery ratios higher than 99.8%. POLYM. ENG. SCI., 58:238-244, 2018. (c) 2017 Society of Plastics Engineers
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