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 379 for “"Polymer matrix"”.
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Nanotube reinforced thermoplastic polymer matrix composites
… make nanotubes attractive reinforcements for polymer matrix composites. However, the structure that makes them desirable also causes highly anisotropic properties and limited reactivity with other materials. This thesis isolates these problems in two separate studies aimed at improving …
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Integrated degradation models for polymer matrix composites
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Control of mechanochromic reactions in a polymer matrix
… and recently developed naphthopyran (NP), in polymeric matrices. First, the effect of force on the rate constants and activation energies for SP–merocyanine (MC) transition is characterized in bulk polymers. Under different values of a macroscopic tensile stress, the change in fluorescence …
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High temperature degradation mechanisms in polymer matrix composites
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Thermal regulation of vascularized fiber-reinforced polymer matrix composites
Fiber reinforced polymer matrix composites (PMC) possess outstanding structural properties, including high strength and stiffness, low weight, long fatigue life, and excellent manufacturability of complex geometries. However, their application is still limited where high temperature service is …
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Investigation of strain rate sensitivity of polymer matrix composites
… investigation into high strain rate behaviour of polymer composites was performed by developing a finite element model for a fibre reinforced polymer (FRP) plates impacted at varying strain rates. The work was divided into three facets, firstly to characterize the FRP material at varying strain …
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Relating polymer matrix composite delamination behavior to constituent properties
… explores the issues associated with predicting polymer matrix composite Mode I delamination behavior from constituent properties by examining the topic from a variety of perspectives. Nanoindentation tests of matrix materials in composites and their associated neat polymers analyze the …
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Rapid manufacturing of high-performance fiber-reinforced polymer matrix composites
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Structural Integrity of Polymer Matrix Composites Exposed to Fire Conditions
Polymer matrix composites (PMC's) perform well under many loading conditions and situations. Exposure of PMC's to fire is a concern due to their inherent material degradation at elevated temperatures. The elevated temperature response of PMC's to combined thermal and mechanical loads are especially …
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Altering the fiber-matrix interphase in semicrystalline polymer matrix composites
When many semicrystalline polymers are used as matrix materials in composites, a morphology known as the transcrystalline region is formed on the surface of the reinforcing material. This region introduces a new crystalline structure to the system that is different from that of the bulk matrix …
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Mechanical response of polymer matrix composites using indentation stress-strain protocols
Polymer Matrix Composites (PMCs) are an important material for many advanced applications due to their potential to combine critical mechanical properties with a high strength-to-weight ratio necessary for advancing automotive and aerospace applications. Such materials have been studied extensively …
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Assessment of dielectric models and their application to polymer matrix composites
… of hollow ceramic spheres embedded in the epoxy matrix on the dielectric behavior of composite was investigated in the 100 Hz to 100 kHz range. It was found that the dielectric constant of epoxy matrix can be reduced by mixing the matrix with hollow ceramic spherical inclusions. To predict the …
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Design and characterization of aromatic thermosetting copolyester resin for polymer matrix nanocomposites
… presents the development of multifunctional polymer nanocomposite systems utilizing aromatic thermosetting copolyester resin enriched with various forms of nanofiller particles. The molecular weight and crosslinking functionality of precursor oligomers during condensation polymerization …
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Stress rupture of unidirectional polymer matrix composites in bending at elevated temperatures
… and used to characterize unidirectional polymer matrix composites. The method. which makes use of very simple fixtures, led to coherent results. These results have been modeled using the large deflection of buckled bars theory (elastica) and it is possible to predict with good accuracy …
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Durability of Polymer Matrix Composites for Infrastructure: The Role of the Interphase
As fiber reinforced polymer matrix composites find greater use in markets such as civil infrastructure and ground transportation, the expectations placed on these materials are ever increasing. The overall cost and reliability have become the drivers of these high performance materials and have led …
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Preparation and Characterization of Magnetic Nanocomposite in a Polymer Matrix By Ion Implantation
… is to induce ferromagnetic metals into a polymer matrix and perform magnetic and electrical characterization on the material. The addition of the ferromagnetic metals should enhance the magneto resistance of the material and also produce semiconductor behavior. The samples consist of a …
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The Effect of Atmospheric Aging on a Hybrid Polymer Matrix Composites' Material Properties
… fibers reinforcing a high temperature epoxy matrix) of a next generation transmission line design were investigated in this research. In particular, the flexural performance (in both static and fatigue loading) of the composite which had been exposed to elevated temperatures for prolonged …
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Micro and nano composites composed of a polymer matrix and a metal disperse phase.
… Hytrel (a thermoplastic elastomer) were used as polymeric matrices in polymer + metal composites. The concentration of micrometric (Al, Ag and Ni) as well as nanometric particles (Al and Ag) was varied from 0 to 10 %. Composites were prepared by blending followed by injection molding. The …
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Degradation of High Voltage Glass Fiber-Reinforced Polymer Matrix Composites by Aggressive Environmental Conditions
<p>Polymer matrix composites reinforced with either E glass or ECR glass fibers-reinforced are used in a variety of high voltage electrical applications because of their advantages like lower weight and cost. However, they can be damaged by aggressive in-service conditions such as high temperature, …
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Synthesis, characterization, and mode I fracture toughness of aligned carbon nanotube polymer matrix nanocomposites
… based vertically-aligned carbon nanotube (A-CNT) polymer nanocomposites (A-PNCs) are manufactured. These A-PNCs can be tested to isolate structure-property relationships between the polymer matrix and the A-CNTs without the presence of the micro-scale fibers. Additionally, A-CNT volume fraction …
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