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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Thermal analysis of ZnO/hollow graphene-oxide/polyester complex- and simple-structure nanocomposites: analytical, simulation and experimental approaches
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Stimuli-Responsive Polymers as Smart Drug Delivery Systems
TL;DR: This chapter serves as a bridge between polymer science and drug release knowledge by understanding the structures of stimuli-responsive polymers.
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Electro-thermal properties and characterization of the flexible polyurethane-graphene nanocomposite films
TL;DR: In this paper , a flexible polyurethane/graphene (PU/G) composition with different mass fractions of reduced graphene oxide (rGO) was synthesized by the in situ polymerization method and the electrothermal properties of the films were investigated.
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Shape memory performances of homogeneous poly(L-lactide-co-ε-caprolactone)/polytrimethylene carbonate-grafted functionalized graphene oxide nanocomposites
TL;DR: In this paper , a simple solution blending of copolymer of L-lactide (LLA) and ε-caprolactone (ε-CL), with acyl chloride functionalized graphene oxide (FGO) grafted with polytrimethylene carbonate (PTMC), was presented.
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Evaluation of osteogenic differentiation of human mesenchymal stem cells (hMSCs) on random and aligned polycaprolactone-polyaniline-gelatin scaffolds
TL;DR: In this paper , a ternary hybrid of polyaniline (PANI), gelatin (GEL), and polycaprolactone (PCL) was used to fabricate aligned and random nanofibrous scaffolds for tissue engineering purposes.
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