1 Improving Glass-Fiber Epoxy Composites via Interlayer Toughening with Polyacrylonitrile / Multiwalled Carbon Nanotubes Electrospun Fibers Christian Narváez-Muñoz 1,2* , Camilo Zamora-Ledezma 3* , Pavel Ryzhakov 1,2 , Jordi Pons-Prats 4,2 , Jeevithan Elango 5 , Carlos Mena 6 , Freddy Navarrete 6 , Víctor Morales- Flórez 7 , Rafael Cano-Crespo 7 , Luis Javier Segura 6,8 1 Escola Tècnica Superior d’Enginyers de Camins, Canals i Ports, C/Jordi Girona 1, Campus Nord UPC, Universitat Politècnica de Catalunya—Barcelonatech (UPC), 08034 Barcelona, Spain. christian.narvaez@upc.edu (C. N.-M.), pryzhakov@cimne.upc.edu (P.R.) 2 Centre Internacional de Mètodes Numérics en Enginyeria (CIMNE), C/Gran Capitán s/n, Campus Nord UPC, 08034 Barcelona, Spain. 3 Tissue Regeneration and Repair Group: Orthobiology, Biomaterials and Tissue Engineering, UCAM-Universidad Católica de Murcia, Campus de los Jerónimos 135, Guadalupe, 30107 Murcia, Spain. czamora9@ucam.edu (C.Z.-L.) 4 Department of Physics, Aeronautics Division, Universitat Politècnica de Catalunya, Barcelona Tech (UPC), Edifici C3, Esteve Terrades, 5, 08860 Castelldefels, Spain. jordi.pons-prats@upc.edu (J.P.-P.) 5 Department of Biomaterials Engineering, Faculty of Health Sciences, UCAM-Universidad Católica San Antonio de Murcia, Guadalupe, 30107 Murcia, Spain. jelango@ucam.edu (J. E.) 6 Universidad de las Fuerzas Armadas (ESPE), Sangolquí, Ecuador. amena@fae.mil.ec (C. M.), fnavarrete@fae.mil.ec (F.N.) 7 Departamento de Física de la Materia Condensada, Universidad de Sevilla, Avenida Reina Mercedes, 41012 Seville, Spain. vmorales@us.es, racacres@us.es 8 Industrial Engineering Department, University of Louisville, Louisville, Kentucky, 40292, USA. ljsegu01@louisville.edu *Authors to whom correspondence should be addressed: christian.narvaez@upc.edu (C.N.- M.), czamora9@ucam.edu (C.Z.-L.)