Shape memory epoxy nanocomposites with carbonaceous fillers and in‐situ generated silver nanoparticles. Issue 4 (30th October 2018)

• Record Type: Journal Article
• Authors: Dorigato, Andrea; Pegoretti, Alessandro
• Is Part Of: Polymer engineering & science. Volume 59:Issue 4(2019)
• Page Start: 694
• Page End: 703
• Publication Date: 2018-10-30
• Subjects: Polymer engineering -- Periodicals; Polymers -- Periodicals; 668.9
• DOI: 10.1002/pen.24985
• Languages: English
• ISSNs: 0032-3888

Abstract

Abstract : Aim of this work is to develop a novel epoxy based nanocomposite and to analyse its shape memory behavior. In particular, silver nanoparticles are in‐situ generated within an epoxy resin subsequently filled with both carbon black (CB) and carbon nanofibers (NFs) at different ratios and at a total amount of 4 wt%. Differential scanning calorimetry shows how the introduction of both CB and NF induces a slight decrease of the glass transition temperature ( T g ) of the samples. The T g drop due to nanofiller addition determines a decrease of both flexural modulus and stress at yield with respect to the neat resin, especially at elevated CB concentrations, while the presence of Ag nanoparticles plays a positive effect on the flexural properties. The best mechanical properties can be detected at a CF/NF ratio of 50%, coupled with a noticeable decrease of the electrical resistivity down to 10 2 Ω·cm and an interesting heating capability through Joule effect. The electro‐mechanical shape‐memory characterization under bending configuration demonstrates how it is possible to obtain an almost complete shape recovery after 60 s under an applied voltage of 220 V. POLYM. ENG. SCI., 59:694–703, 2019. © 2018 Society of Plastics Engineers