Journal ArticleDOI
Shape memory performance of green in situ polymerized nanocomposites based on polyurethane/graphene nanoplatelets: Synthesis, properties, and cell behavior
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TLDR
In this paper, a biocompatible polyurethane/graphene nanoplatelet (PU/GNp) nanocomposites were synthesized from poly(e-caprolactone)diol (PCL diol)/Castor oil and Hexamethylene diisocyanate (HDI) through in situ polymerization.Abstract:
Nowadays, developing biocompatible shape memory polymers is among major expanding topics in medical applications. In this study, novel biocompatible polyurethane/graphene nanoplatelet (PU/GNp) nanocomposites were synthesized from poly(e–caprolactone)diol (PCL diol)/Castor oil and Hexamethylene diisocyanate (HDI) through in situ polymerization. Three different %wt. of GNp were incorporated into the polyol mixtures to monitor the effect of nano fillers on the shape memory behavior of PUs. The chemical structure of nanocomposites was studied by Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies. X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC) were used to evaluate the nanocomposites properties. GNp incorporation affected the bulk morphology as well as thermal properties and crystallinity. Dynamic mechanical thermal analysis (DMTA) revealed the higher elastic modulus values for nanocomposites compared to the pure PU. The biocompatibility of PU/GNp nanocomposites was investigated via MTT assay. Finally, based on shape memory studies, the higher crystallinity, and improved elastic modulus of the nanocomposites resulted in their excellent shape fixity (about 91-96%) and shape recovery (95-99%) behaviors. According to the results, the prepared PU/GNp nanocomposites can be considered as potential choices for applicable shape memory devices for biomedical applications. POLYM. COMPOS., 2017. © 2017 Society of Plastics Engineersread more
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Shape memory thin films of polyurethane: Synthesis, characterization, and recovery behavior
Journal ArticleDOI
The influence of nano‐silica on the thermal conductivity of polyurethane foam
Thi Vi Vi Do,Van Hau Vo Le,Ngoc Uyen Nguyen Thai,Hue Ngan Dai,Anne-Cécile Grillet,Chi Nhan Ha Thuc +5 more
Journal ArticleDOI
Determination of chemical structure, mechanical properties and combustion resistance of polyurethane doped with boric acid:
TL;DR: The low fire resistance property of pristine polyurethane (PU) restricts its areas of usage in domestic applications and especially in the furniture industry as discussed by the authors, therefore, PU based materials should be used for domestic applications.
Journal ArticleDOI
Enhanced mechanical, crystallisation and thermal properties of graphene flake-filled polyurethane nanocomposites: the impact of thermal treatment on the resulting microphase-separated structure
TL;DR: In this paper, the combined effect of the addition of graphite nanoplatelets (xGNPs) to polyurethane copolymer (PUC) and thermal treatment was employed.
References
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Review of progress in shape-memory polymers
TL;DR: It is discussed how the described shape-memory polymers show great potential for diverse applications, including in the medical arena, sensors, and actuators, and as dictated by macromolecular details.
Journal ArticleDOI
Shape-memory polymers
Marc Behl,Andreas Lendlein +1 more
TL;DR: Shape-memory polymers as discussed by the authors are an emerging class of active polymers that can change their shape in a predefined way from shape A to shape B when exposed to an appropriate stimulus.
Journal ArticleDOI
Shape-memory polymers and their composites: Stimulus methods and applications
TL;DR: Shape-memory polymers (SMPs) undergo significant macroscopic deformation upon the application of an external stimulus (e.g., heat, electricity, light, magnetism, moisture and even a change in pH value).
Journal ArticleDOI
Proton beam writing
TL;DR: Proton beam (p-beam) writing as discussed by the authors is a direct writing process that uses a focused beam of MeV protons to pattern resist material at nanodimensions, which is similar in many ways to direct writing using electrons.