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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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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Journal ArticleDOI
Graphene Nanoplatelets-Based Advanced Materials and Recent Progress in Sustainable Applications
TL;DR: Graphene is the first 2D crystal ever isolated by mankind as discussed by the authors, and it consists of a single graphite layer, and its exceptional properties enable applications ranging from energy harvesting and electronic skin to reinforced plastic materials.
Journal ArticleDOI
Electroconductive polyurethane/graphene nanocomposite for biomedical applications
TL;DR: In this paper, the development and characterization of graphene-based electroconductive materials for biomedical applications, and comparison of fabrication methods of the materials to the 3D scaffold were compared.
Journal ArticleDOI
Deep focusing on the role of microstructures in shape memory properties of polymer composites: A critical review
Mahyar Panahi-Sarmad,Mahyar Panahi-Sarmad,Mahbod Abrisham,Mina Noroozi,Arian Amirkiai,Parham Dehghan,Vahabodin Goodarzi,Beniamin Zahiri +7 more
TL;DR: This review is intensely focused on the most recent research on microstructure-property of SMPCs filled by different carbon and silicate-based nano/micro-particles as well as hybrid particles.
Journal ArticleDOI
Preparation of superabsorbent eco-friendly semi-interpenetrating network based on cross-linked poly acrylic acid/xanthan gum/graphene oxide (PAA/XG/GO): Characterization and dye removal ability.
Seyed Mostafa Hosseini,Mohsen Shahrousvand,Shahrokh Shojaei,Hossein Ali Khonakdar,Azadeh Asefnejad,Vahabodin Goodarzi +5 more
TL;DR: PAA/XG/GO hydrogels can be introduced as an eco-friendly adsorbent with high efficiency for the removal of cationic dye pollutions and had a significant effect on methylene blue adsorption.
Journal ArticleDOI
Active composites based on shape memory polymers: overview, fabrication methods, applications, and future prospects
TL;DR: This review is particularly unique in that it included discussions on the various fabrication techniques for SMP composites including their merits and demerits which, to the best of the knowledge, is the first review to include such discussion, thus making it a complete reference material.
References
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Journal ArticleDOI
Interrelated shape memory and Payne effect in polyurethane/graphene oxide nanocomposites
Deepalekshmi Ponnamma,Kishor Kumar Sadasivuni,Kishor Kumar Sadasivuni,Michael Strankowski,Paula Moldenaers,Sabu Thomas,Yves Grohens +6 more
TL;DR: In this paper, the shape memory of polyurethane (PU) nanocomposites was quantitatively analyzed using the Payne effect and the crosslink density was found to be dependent on the thermal transitions of the composites and varied with the filler concentration.
Journal ArticleDOI
Synthesis and shape memory performance of polyurethane/graphene nanocomposites
TL;DR: In this article, small amounts of allyl isocyanate modified graphene (iG, 0-25 ǫphr) were incorporated into acrylate terminated polyurethane (PU) by UV curing.
Journal ArticleDOI
Carbon nanotube–polyurethane shape memory nanocomposites with low trigger temperature
TL;DR: In this article, an ester-based polyurethane (PU) with low glass transition temperature was used to develop shape memory nanocomposites with low trigger temperature.
Journal ArticleDOI
Synthesis and Characterization of Castor-Oil-Modified Hyperbranched Polyurethanes
TL;DR: A series of castor-oil-modified hyperbranched polyurethanes were synthesized via an A2 + B3 approach based on castor oil, macroglycol poly(ϵ-caprolactone)diol or poly(ethylene glycol) (PEG), and diphenyl methane diisocyanate, with or without a chain extender as mentioned in this paper.
Journal ArticleDOI
Polylactide-based thermoplastic shape memory polymer nanocomposites
TL;DR: In this paper, the effect of nano-SiO2 on the mechanical and shape memory properties of polylactide-based copolyester (PLAE) with glass transition temperature (Tg) below body temperature was investigated.