Journal
COMPOSITES COMMUNICATIONS
Volume 39, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.coco.2023.101566
Keywords
3D printing; Low dielectric constant; Shape memory; Sensors
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By synthesizing a bio-based methacrylate resin (MESO) using epoxidized soybean oil (ESO) and methacrylic acid, and incorporating polyhedral oligomeric silses-quioxane (POSS) into the resin matrix, this work demonstrates the creation of sensors and shape memory materials with complex geometry for stereolithography (SLA) printing.
Improving sustainability and functionality of resins is important for the development of 3D printing technologies. This work demonstrates a novel bio-based and low dielectric resin containing polyhedral oligomeric silses-quioxane (POSS) for stereolithography (SLA) printing to fabricate sensors and shape memory materials with complex geometry. Epoxidized soybean oil (ESO) and methacrylic acid are used to synthesize a biobased methacrylate resin (MESO) via a ring-opening reaction, followed by incorporation of POSS into polymer matrix. In general, the viscosity of POSS/MESO composite resins is in the range of 0.40-0.58 Pa s, making them viable for SLA printing designs. With the addition of 5 wt% POSS, POSS/MESO composites can exhibit excellent me-chanical properties, including tensile strength (18.9 MPa), elongation at break (19.8%), and toughness (399.2 MJ/m3). Furthermore, these materials have a very low dielectric constant of 2.97 at 1 MHz, which is desired for microelectronic applications to overcome signal delay and energy loss. In addition, presence of permanent and reversible networks formed by MESO and POSS endows the POSS/MESO composites with good shape memory property. The application demonstrators include fabrication of flexible interdigital electrode sensors and temperature-responsive sensors. Overall, this work provides great potential opportunities to design the bio-based functional sensor with on-demand control over structures by SLA printing.
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