The work presented here concerns the use of sapphire-based layered composites to increase the level of protection for eyewear applications. We analyze the dynamic behavior of sapphire and constitutive properties of polycarbonate, which are the materials involved in the composite…
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Electromagnetic shielding is becoming more and more important with the abundance of wireless devices. Therefore a need has arisen for more versatile, flexible and low-cost solutions for shielding. For these requirements, carbon microfiber material has been proposed for electroma…
The current and forecasted major challenge faced by water utilities is delivering potable water efficiently with minimum loss to end users. Water pipe failure has negative impact not only local communities but also on the nation's economy. The American Water Works Association (A…
Fatigue damage is one of the most unwelcome failure categories encountered in modern engineering components. Recent advent of Carbon fiber reinforced plastic composites in advanced engineering components and structures such as the present-day advanced aircrafts, marine, and othe…
Polyethylene (PE) is the largest produced thermoplastic polymer and is highly used in packaging applications. There exist different types of PE polymers depending on the molecular architecture. The most common types are: Low-Density Polyethylene (LDPE); Linear Low-Density Polyet…
Inverse gas-liquid chromatography (IGC) was used to measure polymer-solvent diffusion and equilibrium parameters using packed and capillary columns at conditions approaching infinite dilution of the volatile component. Measurements were made for several solvents with poly(styren…
The melt miscibility of linear high-density polyethylene (HDPE) and octene-based metallocene linear low-density polyethylene (m-LLDPE) was investigated by rheological and molecular dynamics (MD) simulation techniques. The effects of molecular parameters, like branch content (BC)…
The whole year around severe weather environment of the Kingdom adds tremendous factors in stressing cable materials and shortens their lifetime. The Kingdom petrochemical industries are striving to improve the quality of the plastic raw materials. On the other hand, cable indus…
Polyaryl phosphate oligomers were synthesized by transesterification of triphenyl phosphate with hydroquinone and with bisphenol A. These were used as flame-retardants, in comparison with three commercial controls: triphenyl phosphate, DechloraneR/antimony trioxide 3/1, and deca…
Consumer awareness and stringent environmental legislation has initiated a renewed interest in using plant fibres as reinforcement in thermoplastics. The main objective of this research project is to develop high performance sheet moulded natural fibre thermoplastic composites b…
In the past decade the need for development of specifically engineered structures of polymers has resulted in proliferation of products that are manufactured using various coating and multilayer extrusion technologies. It was well known that this class of flows are susceptible t…
The morphology of raw rubber plays a significant role in the degradation processes of rubber. The results of an experimental study involving a unique technique of surface preparation suggests that there is a hierarchy of morphological levels, i.e. those induced by processing and…
Surface properties of high density polyethylene (HDPE) and cross-linked polyethylene (XLPE) were studied in a number of ways. Firstly, the specimens of these materials were immersed in saline solutions of 0.005, 1, 10 and 100 mS/cm at 0 ± 1, 23 ± 3, 44 ± 2, 73 ± 2 and 98 ± 2°C. …
This thesis reports on the research undertaken to investigate the reduction of the environmental impacts of plastic packaging through the effective selection and application of biopolymers during the pack design process. The principle objective of this research is to develop an …
Characters on computer keyboards are typically printed using one of the two different processes, namely tampographic printing and laser marking. Tampographic printing is time consuming (app. 3-5 mins.), requires skilled workers and employs difficult-to-handle chemicals. On the o…
Rotational molding, also known as rotomolding or rotational casting, is a process for manufacturing hollow seamless articles using polymer in powder form. Experiments were carried out on a bench-scale uniaxial rotational molding machine to evaluate and compare the dimensional st…
Quasiparticle descriptions are a powerful tool in condensed matter physics as they provide an analytical treatment of interacting systems. In this thesis we will apply this tool to theoretically describe two systems: a superconductor interacting with cavity photons and a flowing…
Fused filament fabrication (FFF) based additive manufacturing (AM) of polymers and composites is a growing interest in processing tailorable parts with functional requirements like structural integrity, lightweight, high-temperature capability, etc. In general, the parts manufac…
Meltblowing (MB) is a unique one-step process for producing self-bonded fibrous nonwoven membranes directly from polymer resins, with average fiber diameter ranging between 2 and 5 μm. Determining routes for making nano- or submicron-fibers using this process are desirable since…