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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 56 for “"poly(ethylene terephthalate)"”.
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UV stabilisation of poly(ethylene terephthalate)
The aim of this project was to design novel polymerisable UV absorbers which successfully protect PET from UV degradation for a longer duration of time compared to non-polymerisable UV stabilising additives. The polymerisable UV stabilisers for PET were synthesised using cyanuric chloride as a …
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Nanoscale properties of poly(ethylene terephthalate) vascular grafts
… replacements for damaged blood vessels. Poly(ethylene-terephthalate), PET, has been successfully used in large diameter grafts; however, small caliber grafts are still a major challenge in biomaterials. Due to surface forces, blood plasma proteins adsorb to the graft, resulting in …
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Temperature and rate dependent finite strain behavior of poly(ethylene terephthalate) and poly(ethylene terephthalate)-glycol above the glass transition temperature
Poly(ethylene terephthalate) is widely used for consumer products such as drawn fibers, stretched films, and soda bottles. Much of its commercial success lies in the fact that it crystallizes at large strains during warm deformation processing. The imparted crystallinity increases its stiffness and …
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Synthesis and characterisation of branched poly(ethylene terephthalate)s
… the synthesis and characterisation of branched polyesters. The experimental effort concentrated on the branching of PET-type polymers with a variety of potential branching agents, such as trimesic acid, and the control of branching with end-capping agents, such as benzyl alcohol. The polymers …
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Recovery of Poly (Ethylene Terephthalate) From used X-Ray Film
… to remove primary contaminants viz silver and poly (vinylidene)chloride (PVDC) coating, from X-ray film and subsequent recovery of poly (ethylene) terephthalate (PET) economically.<br/><br/>The thesis commences with a review of the literature, concerning the recycling and recovery of (PET), …
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The mechanics of strain-induced crystallization in poly(ethylene terephthalate)
Poly( ethylene terephthalate) (PET) is a thermoplastic polymer found in numerous commercial applications. PET exhibits the capability of undergoing strain-induced crystallization during processing, the result of which is increased stiffness and hardness as well as better dimensional stability. An …
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Surface analysis of sodium oleate coated poly (ethylene terephthalate) films
Polymer films are often pre-treated to alter surface properties resulting in improved adhesion and wettability. The objective of the present work was to demonstrate the applicability of surface-sensitive techniques in the analysis of polymer films coated with thin overlayers. The surface or …
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Analysis of structural development during superdrawing of poly(ethylene terephthalate) fibers
A comprehensive experimental study was conducted to determine the limitations in processing conditions for superdrawing. Experimental studies were carried out by uniaxial drawing tests at temperatures from 90 to 120°C and at strain rates ranging from 0.008/s to 0.425/s. Crystallinity and …
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Vibrational Spectroscopic Studies of Degradation and Diffusion Processes in Poly(ethylene terephthalate)
The interaction of polyethylene terephthalate (PET) with water at both ambient and elevated temperatures has been studied. The diffusion of water, at ambient temperatures, into PET films, ofthe order of 10 um thick, has been followed using Founer transform infrared attenuated total reflectance, …
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Preparation and characterisation of poly(ethylene terephthalate) and poly(vinyl alcohol)/clay nanocomposites.
The formation of poly (ethylene terephthalate) (PET)/organo-montmorillonite and poly (vinyl alcohol)(PVOH)/ montmorillonite nanocomposites and the diffusion behaviour of water and acetone/water mixtures into the latter have been investigated. Nanocomposites of PET and various, commercially …
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Development of masterbatches for poly (ethylene terephthalate) with improved resistance to CO2 permeation
… PET bottles. Masterbatches of different types of polyamide/clay, PET/clay, PET/nano-silica flakes and PET/divalent layered metal phosphonates (DLMP) were produced by melt compounding and evaluated. In the case of polyamide based nanocomposites PA6 was found to produce the best dispersed …
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Morphological properties of poly (ethylene terephthalate) (PET) nanocomposites in relation to fracture toughness.
… of montmorillonite layered silicate (MLS) on poly (ethylene terephthalate) (PET) matrix was investigated. MLS was added in varying concentration of 1 to 5 weight percent in the PET matrix. DSC and polarized optical microscopy were used to determine the crystallization effects of MLS addition. …
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Biochemical Analysis of Poly(ethylene terephthalate) Film Degradation Kinetics of Engineered IsPETase Variants
… in waste management and recycling technologies. Poly(ethylene terephthalate) (PET) is a major plastic polymer that is heavily investigated for enzymatic recycling. The presence of the ester bond in the polymer allows hydrolysis via serine esterases, such as cutinases and lipases. However, little …
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Modelling the constitutive behaviour of poly(ethylene terephthalate) for the stretch blow moulding process
The stretch blow moulding (SBM) process is the main method for the mass production of PET containers. Understanding and modelling the behaviour of amorphous PET (aPET) is critical for design the optimum product and process.<br/><br/>However due to its nonlinear viscoelastic behaviour, the behaviour …
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The Manufacture and Mechanical Properties of Poly(ethylene terephthalate) Fibers Filled with Organically-Modified Montmorillonite
… with mechanical property improvements to poly(ethylene terephthalate), PET, fibers by the addition of layered silicate nanoparticles and by drawing the un-oriented nanocomposite filaments in a second step. No previous studies on PET fibers filled with montmorillonite (MMT) nanoclay …
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Improving the Exfoliation of Layered Silicate in a Poly(ethylene terephthalate) Matrix Using Supercritical Carbon Dioxide
Supercritical carbon dioxide (scCO2) was used as a processing aid to improve the level of exfoliation achievable in a PET-layered silicate nanocomposite produced from melt compounding. Layered silicate and scCO2 were allowed to mix for a period of time before being released into the second stage of …
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