Papers by Raffaella Suriano
Waveguide and microchannel fabrication in polymers with femtosecond lasers
Additive Manufacturing of Electrically Conductive Nanocomposites Filled with Carbon Nanotubes
Advanced Engineering Materials, Nov 18, 2022
Herein, two photopolymers containing multi‐walled carbon nanotubes (MWCNTs) are newly developed t... more Herein, two photopolymers containing multi‐walled carbon nanotubes (MWCNTs) are newly developed to 3D print electrically conductive structures via near‐visible light (405 nm) stereolithography (SL) process. A free‐radical resin and a hybrid cationic/free‐radical photopolymer are used as a matrix and loaded with MWCNTs. A solution mixing method is selected to obtain an optimal MWCNTs dispersion. Rheological and photo‐calorimetric analyses are performed by varying filler concentrations (0.25%, 0.50%, 0.75 wt%) as well as electrical properties of the cured nanocomposites are measured. Rheological characterization indicates the free‐radical resin loaded with the 0.25 wt% of MWCNTs as the most suitable material for the 3D printing of electro‐active systems because it guarantees a rapid and homogenous resin recoating in the vat during the printing of two different layers due to its fluidity. The optimal printing parameters for this photocurable MWCNTs‐loaded resin are found through photosensitivity and photo‐calorimetric analyses. Electrically conductive structures with a conductivity value of 0.0006 S cm−1 are successfully printed, showing the immense potential of these conductive polymeric materials in replacing other standard silicon‐based materials manufactured by conventional 2D lithographic processes for the development of electronic devices and microelectromechanical systems (MEMS).
Polymers
Polylactic acid (PLA) is one of the most important biopolymers employed on the market due to its ... more Polylactic acid (PLA) is one of the most important biopolymers employed on the market due to its good mechanical strength and barrier properties. On the other hand, this material presents a rather low flexibility, limiting its employment. The valorization of bio-based agro-food waste for the modification of bioplastics is a highly appealing approach for the replacement of petrol-based materials. The aim of this work is to employ cutin fatty acids derived from a biopolymer (i.e., cutin), present in waste tomato peels and its bio-based derivatives as new plasticizers to enhance PLA flexibility. In particular, pure 10,16-dihydroxy hexadecanoic acid was extracted and isolated from tomato peels and then functionalized to give the desired compounds. All the molecules developed in this study were characterized by NMR and ESI-MS. Blends at different concentrations (10, 20, 30, and 40% w/w) the flexibility (Tg measurements with differential scanning calorimetry—DSC) of the final material. Fu...
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Papers by Raffaella Suriano