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Showing 1 to 20 of 37 for “"Photopolymer"”.
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Methodologies for Metal Functionalization of Phosphorus Based Photopolymer Networks
Photopolymer networks with phosphonium cation, alkyl phosphine and olefin functionality were designed, synthesized and functionalized with metals by metathesis, coordination and hydrometallation reactions, respectively. The materials were strategically designed so that the metal functionalization …
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Control of Network Topology in Photopolymer Networks for Additive Manufacturing
… chain transfer (RAFT), and their applications in photopolymer networks to improve material properties and introduce novel functional materials to additive manufacturing. Chapter 2. In this work, we incorporate a RAFT agent into a crosslinker to make chain-transferring crosslinkers, or …
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Characterization of polygrama green photopolymer for Compact Optoelectronic Integrated Neural (COIN) coprocessor applications
… Neural (COIN) co processor [13]. The choice of photopolymers is critical in determining the performance of COIN processors as we look at ways to increase the diffraction efficiency. The focus of this research was to optically characterize Polygrama Green, a photopolymer that is sensitive to …
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Curing Characteristics of Photopolymer Resin With Dispersed Glass Microspheres in Vat Polymerization 3D Printing
The curing characteristics of photopolymer resin determine the relationship between the vat polymerization (VP) process parameters and the layer thickness, geometric accuracy, and surface quality of the 3D printed specimen. Dispersing filler material into the photopolymer resin changes its curing …
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Design and Fabrication of a Mask Projection Microstereolithography System for the Characterization and Processing of Novel Photopolymer Resins
… process, and quantify the performance of novel photopolymers. MPμSL is an Additive Manufacturing process that uses DLP technology to digitally pattern UV light and selectively cure entire layers of photopolymer resin and fabricate a three dimensional part. For the MPμSL system designed in this …
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Fabrication and Characterization of Carbon Nanocomposite Photopolymers via Projection Stereolithography
… patterns light to selectively expose and layer photopolymer into three dimensional objects. Nanomaterials within the photopolymer are therefore embedded inside fabricated objects. Adding varying concentrations of multi-walled carbon nanotubes (MWCNT) to the photopolymer may allow for the …
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The Effects of Quantum Dot Nanoparticles on Polyjet Direct 3D Printing Process
… for this work, utilizes inkjet to deposit a photopolymer into layers, which are then cured with a UV light. An investigation into the visibility of the QDs within the printed PolyJet media revealed that the QDs produce PUF patterns visible via fluorescent microscopy. Furthermore, rheological …
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Characterization of photocurable networks in real-time and post-exposure
… of exposure intensity and exposure time on photopolymer network formation. These techniques enable detailed characterization of photopolymer behavior in real-time and post-exposure. In situ dynamic mechanical analysis was performed to observe the changes in composite modulus during …
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Evaluating strategies for integrating bacterial cells into a biosensor designed to detect electrophilic toxins
… from immobilized cells: a calcium alginate, a photopolymer, and a thermally reversible gel. The calcium alginate was unstable, and dissolved after five days, such that the long-term impact of immobilization on the cells could not be determined in the matrix. The photopolymer resulted in very …
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Evaluating bacterial cell immobilization matrices for use in a biosensor
… has been immobilized in calcium alginate beads, photopolymer disks, and a thermally reversible gel in order to ultimately incorporate the immobilized system into a functional biosensor. The potassium efflux and cell viability were measured in the immobilized matrices. Wastewater treatment is of …
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An Investigation into full color Edge-lit Holographic Optical Elements
… optical elements) in silver halide and photopolymer materials create diffraction structures that have significant impact on effective recording performance. Typical off-axis holographic recording regimes as well as holographic directional diffusers are analyzed to establish a performance …
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Design of electronics for a high-resolution, multi-material, and modular 3D printer
… 10 kHz. The system developed for curing photopolymer materials is low-power, low-cost, and safe, using ultraviolet light-emitting diodes instead of a gas-discharge lamp. Fabrication cost is less than $10,000, but the printer's 600 DPI resolution is comparable to that of industrial 3D …
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Edgelit holography : extending size and color
… using a glass block recording method and DuPont photopolymer recording materials are described. The considerations and procedures for scaling the size of the edgelit hologram up to 20.3 x 25.5 cm (8 x10 in) (400% larger than previously demonstrated) are given. Collimated reference beam, and …
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Materializing Light: Real-time, Handheld Fabrication of Programmable Structural Color
… by exposing a commercially available holographic photopolymer film to user-controlled wavelengths. Within the device, red, green, and blue laser diodes go through an optical prism, combining light and producing mixed color outputs on the film. Additionally, we introduce a resin-based process to …
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Microfluidic approaches to the synthesis of complex polymeric particles
… approach. droplets formed by shearing a curable photopolymer. using a continuous water phase at a T-junction, were constrained to adopt non-spherical shapes by confining them using appropriate microchannel geometries. The non-spherical shapes formed were permanently preserved by photopolymerizing …
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Tailoring Siloxane Functionality for Lithography-based 3D Printing
… the synthesis and characterization of novel photopolymer systems for lithography-based 3D printing. Emphasis on structure-processing-property relationships facilitated the attainment of success in proposed applications and prompted further fundamental understanding for systems that leveraged …
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Process-Property Characterization for Multi-Material Jetting Applications
… process-structure-property relationships in photopolymer-based MJ, which provides a basis for advancing the capability of MJ to fabricate accurate and consistent multi-material parts for functional applications. One of the challenges for advancing MJ is the general lack of processable …
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Improving Ink Feedback Control System for Vision Controlled Jetting 3D Printer
… that operates by repeatedly depositing photopolymer materials in 2 dimensions onto a printing plane, solidifying them using UV light, and scanning the printing plane’s topography to readjust the printing layer accordingly. It has a high printing resolution while also maintaining high …
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Building integrated cell-based microsystems : fabrication methodologies, metrology tools and impact on cellular physiology
… elastomer polydimethylsiloxane (PDMS) and the photopolymer SU-8 which form the core of soft lithography based fabrication. The design of highly integrated microsystems in which microfluidic conduits are coupled with electrical manipulation techniques, however, is difficult to realize with soft …
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