Thermo-mechanical and swelling properties of three-dimensional-printed poly (ethylene glycol) diacrylate/silica nanocomp
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Research Letter
Thermo-mechanical and swelling properties of three-dimensional-printed poly (ethylene glycol) diacrylate/silica nanocomposites John Ryan C. Dizon, Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, USA; Department of Industrial Engineering, College of Engineering and Architecture, Bataan Peninsula State University, City of Balanga, Bataan 2100, Philippines Qiyi Chen, Arnaldo D. Valino, and Rigoberto C. Advincula, Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, USA Address all correspondence to Rigoberto C. Advincula at [email protected] (Received 19 July 2018; accepted 20 August 2018)
Abstract Three-dimensional (3D) printed poly (ethylene glycol) diacrylate (PEGDA) objects have been reinforced with 1%, 3% and 5% silica (SiO2) nanoparticles. Rheological characterizations were conducted for each formulation and 3D-printed using a stereolithographic apparatus (SLA) 3D printer. The tensile and compressive properties of the as-printed nanocomposites were investigated and compared with unreinforced samples. Additionally, the mechanical properties of the objects before and after swelling the samples in deionized water were compared with as-printed ones. Adding SiO2 increased the tensile and compressive strengths of the 3D-printed PEGDA. The tensile and compressive strengths of swollen PEGDA/SiO2 nanocomposite specimens were generally higher than the unswollen specimens.
Introduction Additive manufacturing (AM) technologies are now being used to produce polymer parts with a wide range of properties. Advances on stereolithography apparatus (SLA)-based threedimensional (3D) printers, an example of vat polymerization AM technique, has allowed quick production of parts that are economical, have a smooth surface finish, and with relatively high resolution and quality. SLA can produce polymers with tunable properties from polymer blends and nanocomposites thereby producing parts and devices for applications such as biomedical and dental fields.[1,2] SLA produces parts on a layer-by-layer fashion by means of photopolymerization crosslinking.[3] Photopolymerization is a type of free-radical polymerization initiated by the absorption of light (either visible or ultraviolet).[4] Commonly used monomers are acrylate-based resins due to the ease of forming dense 3D polymer networks upon polymerization resulting in a wide range of physical and chemical properties.[5,6] Nanocomposites of nanoparticles (1–100 nm in size) dispersed in a polymer matrix, as exemplified by silica nanoparticles, nanoclay, graphene, carbon nanotubes, etc. creates synergistic properties to a material when properly nanostructured.[7,8] Nanocomposites, including 3D-printed parts, combine the best properties of organic polymers and inorganic nanomaterials resulting in improved thermal and mechanical properties.[7,9–12] This is in part, due to the high surface areato-volume ratio surface interaction between nanofiller and polymers in nanoco
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