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Castor oil-based UV curable acrylate resins for digital light processing (DLP) 3D printing technology
No full textBiobased resins are a promising sustainable alternative to traditional petroleum-based polymers in Digital Light Processing (DLP) 3D printing. This study focuses on developing a castor oil-based UV-curable acrylate resin that is renewable. Castor oil was chemically modified with methacrylic anhydride (MAA) via an esterification process to synthesize castor oil-based methacrylate ester (CO_MAA), enhancing its photopolymerization efficiency and crosslinking potential. To comprehensively evaluate the resin\u27s properties, several characterization techniques such as FT-IR and NMR spectroscopy were conducted that confirmed the successful chemical modification. Furthermore, the viscosity measurements of the CO_MAA resins were investigated to gain insight into the printability of the synthesized photocurable resins. Indeed, the dynamic mechanical analysis (DMA) of the UV-cured film of CO_MAA exhibits a glass transition temperature (Tg) of 10.44 oC. Moreover, the thermal properties of the UV-cured object were examined by TGA analysis, demonstrating that the resin can withstand high temperatures before degradation. Tensile testing showed the tensile strength of CO_MAA film is 1.8 MPa, confirming the material\u27s elasticity and mechanical strength. Additionally, gel content and swelling behavior validated the resin\u27s crosslinking efficiency and solvent resistance. The results indicate that this castor oil-derived resin exhibits excellent UV-curability, strong mechanical properties, and high-resolution printability, making it a promising material for DLP 3D printing applications
Beyond Boundaries: Preparing General Educators for Inclusive Classrooms
No full textThe preparedness of general educators for the inclusion of special education students is a crucial aspect of fostering inclusive classrooms. Teacher preparation programs are continuously designed and improved to ensure that every student receives the education they deserve, including students with disabilities or exceptionalities as dictated by the Individuals with Disabilities Education Act (IDEA) of 1975. This study aims to explore the extent of educators\u27 preparedness to work with special education students and identify areas for improvement. Surveys were distributed to general educators, special educators, and preservice teachers to collect data on their training, confidence levels, challenges, and the overall effectiveness of current training programs. Further discussions with these individuals highlighted their experiences with special education students and identified areas of insufficient education. Analysis of the data indicates a significant gap in the training of general educators, with many expressing concerns about their ability to support special education students effectively. Educators who completed a dual licensure program in special and general education reported higher levels of confidence and preparedness compared to their counterparts with minimal specialized training. The findings emphasize the need for more extensive training programs that equip general educators with the necessary skills for inclusive classrooms. Recommendations include offerings additional courses related to teaching special education, embedding new strategies into preexisting classes, increasing the number of universities that offer dual licensure programs, and including ongoing professional development opportunities related to special education within the teacher education program
Understanding the role of gut microbiota in the development visceral hypersensitivity - A literature review
No full textPersistent abdominal pain is one of the most impactful symptoms across various gastrointestinal disorders. Increased sensitivity to bowel distention, termed visceral hypersensitivity (VH), is a primary driver of chronic abdominal pain. Differences in microbial colonization are associated with disease, but how bacteria drive pain and the potential therapeutic targets remain poorly understood. This review illustrates applications of microbiome-based diagnostics referring to currently available literature and also describes the aims of the proposed research. Using metagenomic analysis, the role of microbial communities in many infectious diseases can be ascertained including response to cancer immunotherapy and transplant safety. Investigating the effects of microbiota on VH will supplement our current understanding of how these milieus change over a given treatment regime. This background knowledge leads to our first specific aim: to study how the composition of the gut microbiome evolves temporally when VH is induced in both male and female mice by sequencing the collected fecal material and comparing using 16S metagenomics. Future research may be focused on developing precise methods for manipulating the microbiome and creating targeted treatments for specific conditions. This frames our second specific aim: to study the microbiota after treatment with broad spectrum antibiotics or spermidine-supplemented diet employing molecular diagnostics such as multiplex qPCR technique to detect selected bacterial species (e.g. Bacteroides, Enterococcus, Dorea, Clostridium and/or Ruminococcus). The ultimate goal of this research project is to systematically assess the impact of altered microbial colonization on the host and examine novel therapeutic approaches to restoration/stabilization of the microbial response
Self-Healing Polyurethane Elastomers Based on a Disulfide Bond by Digital Light Processing 3D Printing
No full textA type of polyurethane elastomer with excellent self-healing ability has been fabricated through digital light processing 3D printing. First, a type of polyurethane acrylate containing disulfide bonds is synthesized and then compounded with reactive diluent and photoinitiators to get a photopolymer resin. Due to the good fluidity and high curing rate, the photopolymer resin can be applied in DLP 3D printing, and various 3D objects with complicated structures, high printing accuracy, and remarkable self-healing ability have been printed. The tensile strength and elongation at break of the polyurethane elastomer are 3.39 ± 0.09 MPa and 400.38 ± 14.26%, respectively, and the healing efficiency can get to 95% after healing at 80℃ for 12 h and can be healed for multiple times. With the ease of fabrication and excellent performance, the polyurethane elastomers from DLP 3D printing have great potential applications in flexible electronics, soft robotics, and sensors
SOYBEAN OIL-DERIVED ACRYLATE/METHACRYLATE ETHER FOR HIGH RESOLUTION ADDITIVE MANUFACTURING (3D PRINTING) TECHNOLOGY
Get PDFAdditive Manufacturing is one of the rapidly developing techniques, as industries continue to explore new ways to create prototypes and end-use parts, one of the significant challenges that remains is the reliance on petroleum-based plastics for 3D printing, especially in the production of photocurable resins. that may be used to prototype complex structures and sophisticated geometries that are typically challenging to produce with conventional methods. Thus, replacing petroleum-based plastics with renewable resources is increasingly important for additive manufacturing (3D printing) of photocurable resins. The use of bio-based renewable resources in AM is a feasible alternative to traditional petroleum-based plastics. Henceforth, the development of sustainable inks has gained substantial interest in the modern polymer industry by reducing its environmental impact. In this context, vegetable oil is a valuable plant-based renewable source and is expected to be an alternate feedstock for 3D printing, due to its broad spectrum of applications, affordable price, and potential biodegradability. In this perception, the present work demonstrates the development of soybean oil-based photo-curable resins (ESBO_HEA/HEMA) for application in digital light processing (DLP) photopolymerization. At first, acrylated/methacrylated soybean oil (ESBO_HEA/HEMA) was efficiently synthesized from the corresponding epoxidized soybean oil by one-pot oxirane ring opening strategy as an alternate to conventional acrylated epoxidized soybean oil (AESO) generated via acrylation between ESO and acrylic acid. A series of DLP inks for 3D printing have been formulated using synthesized soybean oil acrylate/methacrylate in the presence of photoinitiator (TPO) and or, reactive diluents (Trimethylolpropane triacrylate, TMPTA). Moreover, the rheological properties, especially the resin\u27s viscosity of all formulated inks were investigated which are in good agreement for DLP 3D printing. Additionally, the impact of reactive diluent (TMPTA) on the thermal (DSC, TGA) and mechanical (DMA, tensile strength, and hardness) behavior of the 3D-printed object was also examined. Altogether, the present research work demonstrates the use of biobased and inexpensive soybean oil which offered a simple method to prepare potential inks for DLP 3D printing that could be used in the additive manufacturing industry to make architectural models and automotive components which opens new avenues for 3D printing that is sustainable
Bruce Daniels
No full textPhotograph of a faculty member who served as editor for the Midwest Quarterlyhttps://digitalcommons.pittstate.edu/yearbookphotos/1058/thumbnail.jp
Pinmarks from E. Haldeman-Julius Plates
No full textA digital recreation of pin- and manufacturing marks found on printing plates used by the Haldeman-Julius Company to print the Little Blue Books and other publications.https://digitalcommons.pittstate.edu/printdept/1000/thumbnail.jp
Weede - Construction, Undated
No full textBlack and white photo of the Garfield W. Weede Gymnasium under construction. Four men observe the progress-- concrete brick walls and pillars have been erected and the ductwork appears to have been installed.https://digitalcommons.pittstate.edu/weede_gym/1060/thumbnail.jp
Football Players at Practice
No full textBlack and white photo of football players in the practice field across the street (Homer) from the Weede practicing passes.https://digitalcommons.pittstate.edu/weede_gym/1064/thumbnail.jp