Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 69 for “"Polymer matrices"”.
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Inorganic Nanoparticle Nucleation on Polymer Matrices
… like silver and gold, have been introduced into polymers for use as antimicrobial coatings or dielectric materials, respectively. The challenge in creating these materials currently is the difficulty to homogeneously disperse the particles throughout the polymer matrix. The uneven dispersion of …
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Study of controlled release of dapsone from modified montmorillonite and polymer matrices
… and their combination with an anionic copolymer (Eudragit S100). The effects of the excipients on the API dissolution rate were studied from their release profile in simulated intestinal fluid (pH=7.4) at 37+/-0.5 C. In the first part of the research, ionizable Dapsone was intercalated in …
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Regulation of drug delivery from porous polymer matrices using oscillating magnetic fields
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Medical Engineering and Medical Physics, 1984.
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Study of controlled release of active pharmaceutical ingredients from functionalized nanoclays and polymer matrices
… relationships of pharmaceutical polymer-based products. They are: a) modification of a pharmaceutical anionic nanoclay with two different Active Pharmaceutical Ingredients (APIs) to produce nanohybrid API carriers intended to be used alone or in acrylic polymer matrices, b) …
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Process for Improving the Exfoliation and Dispersion of Nanoclay Particles into Polymer Matrices Using Supercritical Carbon Dioxide
… to help exfoliate and disperse nanoclay into the polymer matrices at high clay content. The process involves the use of a pressurized CO₂ chamber to assist in the exfoliation and delivery of the clay into a stream of polypropylene (PP) melt within the extruder. This CO₂ method was evaluated and …
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The investigation of acid/base interactions in the adhesion of carbon fibers to thermoplastic matrices
… of reinforcing carbon fibers to thermoplastic polymer matrices. Inverse gas chromatography (IGC) and x-ray photoelectron spectroscopy (XPS) were used to characterize the acid/base nature of the carbon fiber surfaces. Capillary column IGC (CIGC) was used to determine the acid/base nature of …
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Enhancing Self-Healing Properties of Polymeric Nanocomposites through Surface Modification of Van der Waals 2D Materials: Exploring Beyond Graphene
… MXene have been incorporated as nanofillers in polymer matrices to enhance their self-healing capabilities. The surface modification of these 2D materials with suitable functional chain ends is achieved and the resulting nanosheets possess the ability to chemically bond with the polymer matrix …
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Modeling of nano-scale fracture mechanisms in a graphene sheet using the atomistic j-integral
… a few weight percent of nanoscale particles in polymer matrices to mitigate the brittleness and microcracking of polymer matrices without incurring weight penalty and improve their strain to failure and fracture toughness. This thesis aims at studying these length scale effects in nano-fillers, …
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Characterization of Aligned Carbon Nanotube/Polymer Composites
… disperse and align SWNTs in two different polymer matrices to obtain an orthotropic composite whose strength, stiffness and electrical properties depend on the orientation of the SWNTs. The SWNTs are successfully dispersed and aligned in a polyimide matrix and a polymer blend of UDMA/HDDMA. …
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Manufacture of aerospace-grade thermoset and thermoplastic composites via nanoengineered thermal processing
… reinforcement with thermoset and thermoplastic polymer matrices. With the increasing use of such composites, the need for energy-efficient, cost-effective methods to produce composite structures is desired. Traditional curing processes such as autoclaves and ovens rely on convective heat …
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Plant proteins as multifunctional additives in polymer composites
… thermal stability, and (3) lowered the cost of polymer composites. Wheat proteins were utilized in two polymer matrices: poly(vinyl alcohol) (PVA) and synthetic cis-1,4-polyisoprene rubber (IR). The proteins were hydrolyzed and dispersed in the polymer matrix, where they cooperatively …
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TEMPO-oxidized Nanocelluloses: Surface Modification and use as Additives in Cellulosic Nanocomposites
… TONc as reinforcing additives in cellulosic polymer matrices. In the first part of the work, covalent (amidation) and non-covalent (ionic complexation) coupling were compared as treatment techniques for the hydrophobization of TONc surfaces with octadecylamine (ODA). Subsequently, TONc and …
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Biorenewable polymer thermoplastic biocomposites
… in nature and do not adhere well to hydrophobic polymer matrices. Directly combining plant fibers with plastics tends to yield poor mechanical properties because of this incompatibility. These plant fibers must first go through treatment(s) to alter their surface properties, mechanically and/or …
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Polydimethylsiloxane-Based Self -Healing Composite and Coating Materials
… demonstrate the bulk self-healing property of a polymer composite composed of a phase-separated PDMS healing agent and a microencapsulated organotin catalyst by chemical and mechanical testing. Another significant research focus is on self-healing polymer coatings which prevent corrosion of a …
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Developing test strips for naked-eye detection of alpha-hydroxy acids using indicator-displacement assays: an application of molecular recognition
… by treating filter papers and various polymer matrices with the receptor and indicator. Also, investigations into the effect of pH on the host-indicator affinity, and the development of a new synthetic host to sense aspartic acid and glutamic acid are presented. In other words, chapters …
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Organic materials for holographic applications
… molecules (EBBA and MBBA) have been dispersed in polymer matrices for volume holographic storage. Dynamic holographic effects due to thermal and optically driven anisotropies are observed.
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Characterization of composites with aligned carbon nanotubes (CNTs) as reinforcement
… and multifunctional performance benefits. CNT/polymer composites and two different hybrid architectures are experimentally investigated in this work. A novel process for rapidly growing dense, long, high-quality aligned CNT forests is employed. The first architecture is comprised of aligned …
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The development and evaluation of antibacterial polymer-phyllosilicate composite systems for the treatment of infected wounds
… and also enables their incorporation into polymer matrices for the development of advanced wound care materials. By developing novel antibacterial phyllosilicate-polymer composite materials it should be possible to support wound healing, whilst simultaneously treating infections locally to …
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Novel Synthesis of Bulk Nanocarbon (BNC)
… applications such as reinforcement in metal and polymer matrices. A bulk nanocarbon (BNC) material was synthesized using high energy ball milling and the carbonization of corn cob. Corn cob was mechanically milled for up to 20 hours by applying high energy ball milling to produce the milled …
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Fabrication and Characterization of Multifunctional Soft Composites for Hybrid Electronic Systems
… with solid silver (Ag) flakes within deformable polymer matrices to maintain mechanical compliance while also achieving thermal and electrical functionality. Furthermore, adhesive properties of LM composites are enhanced through a chemical anchoring technique, while the composition and …
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