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 210 for “"Polymer composites"”.
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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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Viscoelastic Properties of Polymer Composites During Processing
… characterized and modeled for the purpose of composites process modeling. Measurement of matrix viscoelastic properties during cure was accomplished through two experimental approaches, each suited to a particular range of cure states. To investigate the material behavior during later stages …
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Self-reinforced polymer composites for energy absorbing applications
Self-reinforced polymer composites (SRC), with a highly oriented thermoplastic reinforcement and a matrix with less degree of crystallinity–from the same or similar polymer family - have been introduced to mitigate some of the drawbacks of widely-used conventional composites, such as recyclability …
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Creep behavior of natural fiber reinforced polymer composites
Creep behavior of natural fiber/polymer composites (NFPCs) was studied in response to the increasing application of this material as structural building products. Factors that influence creep behavior of the composites were investigated by analyzing creep curves of several different NFPC systems, …
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Synergistic Environmental Aging of Glass Reinforced Polymer Composites
… environmental degradation of Glass Reinforced Polymer (GRP) composites were examined and a novel synergistic aging model was proposed in this study. Six GRPs based on glass fibers with four different polymer resins and six pure polymer thermoplastic resins were exposed either individually or in …
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Energy absorption in Ni-Mn-Ga/ polymer composites
… materials made from Terfenol-D particles in a polymeric matrix could solve the issue of the brittleness while retaining a large fraction of the strain output of the alloy. At first glance a similar approach could be used to solve the brittleness issue of Ni-Mn-Ga, but the low blocking force of …
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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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Functional Polymer Composites for Clinical and Engineering Challenges
… presents the design and development of novel polymers engineered to outperform widely used commercial materials across a range of demanding applications. The central theme of this work is the deliberate tuning of polymer structure, identity, and architecture to achieve targeted functional and …
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Processing and characterization of ceramic superconductor/polymer composites
… can be alleviated by making superconductor/polymer composites. One goal of this research is to process high temperature superconductor/polymer composites and to systematically characterize them. A second objective of this research 1s to determine if a superconductor/polymer composite can …
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Absorption-Dominant Electromagnetic Interference Shielding Polymer Composites and Foams
The development of conductive polymer composites (CPCs) and foams offers a promising solution for achieving absorption-dominant electromagnetic interference (EMI) shielding while mitigating secondary electromagnetic pollution. Despite the significance of structural and geometrical factors in …
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The development of sub-micro filler enhanced polymer composites
Sub-micro silica flakes and graphite reinforced polymer composites have been developed in this research. The sub-micro polymer composites are designed to overcome problems associated with nanocomposite technology. Apart from the high cost of production, the other major problem in nanocomposites is …
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New generation fiber reinforced polymer composites incorporating carbon nanotubes
… observed an increasing use of fiber reinforced polymer(FRP) composites as alternative construction materials for aerospace and infrastructure. The high specific strength of FRP attracted its use as non-corrosive reinforcement. However, FRP materials were characterized with a relatively low …
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Development of multifunctional polymer composites with self-healing capability
… composite materials, the concept of self-healing composites refers to the design of materials capable of autonomously restoring lost mechanical properties. The advantages of self-healing composites are numerous, including reduced maintenance and repair costs, and improved service life, leading to …
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Preparation of Polymer Composites As Dielectric Materials For Capacitors
<p>Polymer composites with the well-dispersed dielectric ceramic powders as fillers have exhibited enhanced dielectric properties compared to the neat polymers. Polyvinylidene fluoride (PVDF) based ferroelectric polymers are mainly used for energy storage. And CaCu3Ti4O12 (CCTO) is still a novel …
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Dispersion of carbon nanotubes in vinyl ester polymer composites
… of different types of carbon nanotubes in a polymer resin. Single-walled (SWNTs), double-walled (DWNTs), multi-walled (MWNTs) and XD-grade carbon nanotubes (XD-CNTs) were dispersed in vinyl ester (VE) using an ultra-sonic probe at a fixed frequency. The power, amplitude, and mixing time …
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Rice straw fiber polymer composites: thermal and mechanical performance
… on various properties of rice-straw based polymer composites were also investigated. Rice straw fibers can work well with both VHDPE and RHDPE as reinforcing filler. Also, different components of rice straw had no significant influence on mechanical properties of composites. The PE-g-MA/EPR …
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Directed Colloidal Assembly and Characterization of PZT -Polymer Composites
… of gel structure in these inks. 3-X type PZT-polymer composites consisting of PZT lattices in a polymer matrix (3-3), a lattice/polymer matrix with PZT faceplates (3-2), or a lattice/polymer matrix with faceplates and encircled by a solid PZT ring (3-1) were formed and their piezoelectric …
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Thermo-Mechanical Behavior of Polymer Composites Exposed to Fire
One of the most critical issues for Polymer Matrix Composites (PMCs) in naval applications is the structural performance of composites at high temperature such as that experienced in a fire. A three-dimensional model including the effect of orthotropic viscoelasticity and decomposition is developed …
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Micromechanics-Based Strength and Lifetime Prediction of Polymer Composites
… lifetime of a unidirectional carbon fiber/polymer matrix composite using micromechanical techniques. Sources of material variability are incorporated into these models to predict probabilistic distributions for strength and lifetime. This approach is best suited to calculate material …
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