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Polymer and Organic Materials Commons™
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Articles 1 - 9 of 9
Full-Text Articles in Polymer and Organic Materials
Effect Of Temperature On Physicochemical Properties Of Plasticized Hydroxypropyl Methylcellulose K100–Carbopol 934 Films Containing Propylene Glycol As Plasticizer, Braja Bihari Panda, Rudra Narayan Sahoo, Amit Kumar Nayak
Effect Of Temperature On Physicochemical Properties Of Plasticized Hydroxypropyl Methylcellulose K100–Carbopol 934 Films Containing Propylene Glycol As Plasticizer, Braja Bihari Panda, Rudra Narayan Sahoo, Amit Kumar Nayak
Makara Journal of Science
This paper studies the effect of different temperatures on different important physicochemical characteristics of plasti-cized hydroxypropyl methylcellulose (HPMC) K100-Carbopol 934 films containing propylene glycol (as a plasticizer), such as the rheology, thickness, folding endurance, tensile strength, elongation, and in vitro swelling with diffusion ki-netics. Rheology of HPMC K100-Carbopol 934 blend dispersions containing propylene glycol (before film casting) demonstrates that the flow is shear thinning and pseudoplastic. In the study of in vitro swelling, the relaxation-controlled transport is the predominant process of solvent diffusion into these plasticized HPMC K100–Carbopol 934 blend films under study. The results suggest that the solvent transport …
Predicting Rheology Of Uv-Curable Nanoparticle Ink Components And Compositions For Inkjet Additive Manufacturing, Cameron D. Lutz
Predicting Rheology Of Uv-Curable Nanoparticle Ink Components And Compositions For Inkjet Additive Manufacturing, Cameron D. Lutz
Master's Theses
Inkjet additive manufacturing is the next step toward ubiquitous manufacturing by enabling multi-material printing that can exhibit various mechanical, electronic, and thermal properties. These characteristics are realized in the careful formulation of the inks and their functional materials, but there are many constraints that need to be satisfied to allow optimal jetting performance and build quality when used in an inkjet 3-D printer. Previous research has addressed the desirable rheology characteristics to enable stable drop formation and how the metallic nanoparticles affect the viscosity of inks. The contending goals of increasing nanoparticle-loading to improve material deposition rates while trying to …
Inherently Porous Metal Structures With Sufficient Mechanical Properties Through Direct Writing Of Bio-Based Inks, Havva Eda Aysal
Inherently Porous Metal Structures With Sufficient Mechanical Properties Through Direct Writing Of Bio-Based Inks, Havva Eda Aysal
Graduate Theses, Dissertations, and Problem Reports (ETD)
There is currently a burgeoning interest in developing 3D printed metal structures with inherent porosity and sufficient mechanical properties for mass customization in the biomedical field. Current approaches for 3D printing of biocompatible metals rely on powder-bed fusion methods which are energy intensive and utilize large amounts of metal powder that is challenging to recycle. In addition, such methods aim on producing dense parts and porosity generation, within the printed part, is challenging due to the complex physics of the melting pool. Here, a relatively new and promising approach is undertaken to study the 3D printing of inherently porous structures …
Investigating The Rheological Behavior Of A Simple Yield Stress Fluid Under Shear Flows, Francesco Accetta
Investigating The Rheological Behavior Of A Simple Yield Stress Fluid Under Shear Flows, Francesco Accetta
Theses
Many soft materials display unique and complex rheological behavior characterized by a transition from a solid-like to a fluid-like state upon the application of a force that exceeds the threshold to flow, known as the yield stress. Yield stress fluids are found in a wide range of commonly encountered materials including microgels, emulsions, and foams, and have been widely studied by rheologists over the last several decades. Carbopol is a popular polymeric microgel system as it displays simple, non-thixotropic rheological behavior and is typically seen as an ideal yield stress fluid. Previous research has demonstrated the reproducible behavior of shear …
Development Of The Composition Of A Composite Material Based On Thermoreactive Binder Ed-20, Umida Ziyamukhamedova, Gavhar Miradullayeva, Erkin Rakhmatov, Jasur Nafasov, Mavtuna Inogamova
Development Of The Composition Of A Composite Material Based On Thermoreactive Binder Ed-20, Umida Ziyamukhamedova, Gavhar Miradullayeva, Erkin Rakhmatov, Jasur Nafasov, Mavtuna Inogamova
CHEMISTRY AND CHEMICAL ENGINEERING
The aim of the study is to determine the effect of the type of structural modifier and filler on the structure formation and technological properties of potting composite polymeric materials (HCPM) and protective coatings for sheet and complex-configuration technological equipment, taking into account their rheological properties. Compositions of composite polymer materials based on a thermosetting binder of epoxy-diane resin ED-20 filled with a mineral filler - kaolin modified with gassipol resin (GS) - were developed using Newton's interpolation formula and the Lagrange method. The optimal amount of gossypol resin determined in the composition of the composite – in the amount …
Non-Toxic Soil Thickeners For Reducing Mudslide Intensity, Miranda Miao, Isaac Blackburn, Erika Haley Yao
Non-Toxic Soil Thickeners For Reducing Mudslide Intensity, Miranda Miao, Isaac Blackburn, Erika Haley Yao
Materials Engineering
Non-toxic food thickeners were investigated as a solution for thickening mud to mitigate the effects of mudslides. All soil was obtained from a site on the California Polytechnic State University campus where a mudslide occurred in 2017. Guar gum was mixed into the soil at 1 wt% and 10 wt% of the moisture content in the soil. Whey protein was mixed into the soil at 2 wt% and 19 wt% of the moisture content in the soil. The soils’ liquid limit was found using the Casagrande cup testing method. Liquid limit testing indicated that thickeners raised the liquid limit, most …
Investigation Of Fracture And Healing Behavior Of Thermoreversible Gels Via Oscillation Rheology, Krithika Subramaniam, Travis Thornell, Kendra Erk
Investigation Of Fracture And Healing Behavior Of Thermoreversible Gels Via Oscillation Rheology, Krithika Subramaniam, Travis Thornell, Kendra Erk
The Summer Undergraduate Research Fellowship (SURF) Symposium
Thermoreversible gels have the unique ability to self-heal, or repair themselves, once they are fractured. They are physically cross-linked, thus providing them with the capability to reform their broken bonds as a function of temperature. The objective of this project is to determine the extent of the gels’ recovery. If self-healing does in fact occur, these gels can be applied in various industries, including medicine for drug delivery or paints and coatings. The tri-block polymer poly(methyl methacrylate)-poly(n-butyl acrylate)-poly(methyl methacrylate) (PMMA-PnBA-PMMA) was heated and stirred with 2-ethyl-1-hexanol to create a polymer gel. Through the use of a rheometer, a shear stress …
Rheological Characteristics Of Solvent Free Nanofluids: Thermal Transitions And Reactive Curing, Daniel Chojnowski
Rheological Characteristics Of Solvent Free Nanofluids: Thermal Transitions And Reactive Curing, Daniel Chojnowski
Master's Theses and Doctoral Dissertations
Solvent-free nanofluids are a new and exciting class of material that evolved to address the limitations of their predecessors, nanocomposites. One of the most exciting aspects of solvent-free nanofluids is the wide range of tools chemists have to build and study them. Understanding how the structure manipulations impact the rheology of the resulting solvent-free nanofluids is essential if solvent-free nanofluids are truly the technology of the future. This work documents the basic rheological parameters, thermal transitions, and curing kinetics of various solvent-free nanofluids synthesized by Zhiming Qiu and Kejian Bian at the Coating Research Institute at Eastern Michigan University.
Determinations Of Molecular Weight And Molecular Weight Distribution Of High Polymers By The Rheological Properties, Joan Y. Z. Huang
Determinations Of Molecular Weight And Molecular Weight Distribution Of High Polymers By The Rheological Properties, Joan Y. Z. Huang
Mechanical & Aerospace Engineering Theses & Dissertations
Several methods are reviewed by which the molecular weight (MW) and molecular weight distribution (MWD) of polymeric material were determined from the rheological properties. A poly (arylene ether) polymer with six different molecular weights was used in this investigation. Experimentally measured MW and MWD were conducted by GPC/LALLS (Gel Permeation Chromatography/Low Angle Laser Light Scattering), and the rheological properties of the melts were measured by a Rheometric System Four rheometer. It was found that qualitative information of the MW and MWD of these polymers could be derived from the viscoelastic properties, with the methods proposed by Zeichner and Pate1, and …