title: MWCNTs-reinforced epoxidized linseed oil plasticized polylactic acid nanocomposite and its electroactive shape memory behaviour.
abstract: A novel electroactive shape memory polymer nanocomposite of epoxidized linseed oil plasticized polylactic acid and multi-walled carbon nanotubes (MWCNTs) was prepared by a combination of solution blending, solvent cast technique, and hydraulic hot press moulding. In this study, polylactic acid (PLA) was first plasticized by epoxidized linseed oil (ELO) in order to overcome the major limitations of PLA, such as high brittleness, low toughness, and low tensile elongation. Then, MWCNTs were incorporated into the ELO plasticized PLA matrix at three different loadings (2, 3 and 5 wt. %), with the aim of making the resulting nanocomposites electrically conductive. The addition of ELO decreased glass transition temperature, and increased the elongation and thermal degradability of PLA, as shown in the results of differential scanning calorimetry (DSC), tensile test, and thermo gravimetric analysis (TGA). Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to observe surface morphology, topography, and the dispersion of MWCNTs in the nanocomposite. Finally, the electroactive-shape memory effect (electroactive-SME) in the resulting nanocomposite was investigated by a fold-deploy "U"-shape bending test. As per the results, the addition of both ELO and MWCNTs to PLA matrix seemed to enhance its overall properties with a great deal of potential in improved shape memory. The 3 wt. % MWCNTs-reinforced nanocomposite system, which showed 95% shape recovery within 45 s at 40 DC voltage, is expected to be used as a preferential polymeric nanocomposite material in various actuators, sensors and deployable devices.
authors.affiliation: King Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. jaavedalam@gmail.com.
authors.forename: Javed
authors.initials: J
authors.lastname: Alam
authors.affiliation: Research Center, College of Science, King Saud University, P.O. Box 2454, Riyadh 11451, Saudi Arabia. malamiitd@gmail.com.
authors.forename: Manawwer
authors.initials: M
authors.lastname: Alam
authors.affiliation: Amity Institute of Nanotechnology, Amity University, Sector 125, Noida 201303, U.P., India. mohanraja27@gmail.com.
authors.forename: Mohan
authors.initials: M
authors.lastname: Raja
authors.affiliation: Department of Medical Genetics, Faculty of Medicine, Umm Al Qura University, P.O. Box 715, Makkah Al Mukarramah 21421, Saudi Arabia. zainulbio@gmail.com.
authors.forename: Zainularifeen
authors.initials: Z
authors.lastname: Abduljaleel
authors.affiliation: King Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia. ldass@ksu.edu.sa.
authors.forename: Lawrence Arockiasamy
authors.initials: LA
authors.lastname: Dass
mesh_terms: D002152:Calorimetry, Differential Scanning; D004553:Electric Conductivity; D019344:Lactic Acid / Q000737:chemistry*; D008043:Linseed Oil / Q000737:chemistry*; D008422:Materials Testing; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010968:Plasticizers / Q000737:chemistry*; D011091:Polyesters; D011108:Polymers / Q000737:chemistry*; D013718:Tensile Strength; D013818:Thermogravimetry
chemical_list: D037742:Nanotubes, Carbon; D010968:Plasticizers; D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; C033616:poly(lactide); D008043:Linseed Oil