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 11 of 11 for “"Degradation of polymers"”.
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Effect of Transition Metal Compounds on the UV Degradation of Polymers
The effects of typical nickel complex light stabilisers as UV screens and as additives were compared in model systems initiated by hydroperoxides or carbonyl compounds. Oxygen absorption studies showed the nickel oxime and nickel dithiocarbamate complexes to impart a stability additional to UV …
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Bulk and interfacial degradation of polymers used for electronic and photonic applications
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1996.
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Diblock carbon nanotubes compatibilized immiscible polymer blends
Plastic pollution is one of the most serious environmental challenges the world is currently facing. From contaminating soil and oceans to harming animals that consume it, the damages caused by mismanaged plastic waste require immediate action. Of the solutions that currently exist to deal with …
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Catalytic Degradation of Waste Polymers
Plastics have become an integral part of our lives. However, the disposal of plastic waste poses an enormous problem to society. An ideal solution would be to break down a polymer into its monomer, which could then be used as the building-blocks to recreate the polymer. Unfortunately, the majority …
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Biodegradable polyanhydrides as drug delivery systems
… drug delivery. In aqueous media the breaking of the anhydride bonds resulting in gradually polymer fragments collapse and release drugs in a controlled manner. In this study, two new biodegradable polyanhydrides copolymers were synthesised using a melt-polycondensation method. The first is …
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Identification of volatile organic compounds in the early stages of fire from commercial products
… ubiquitous in daily life, but there is a lack of published research on their thermal behaviour and volatiles released in the early stages of a fire. In both analytical and applied applications, knowledge about the chemical processes taking place during pyrolysis is essential. Many techniques …
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Tuning The Properties Of Soft Materials Through Extreme Nanoconfinement
Polymers and small molecules under nanoconfinement can show significantly deviated properties from bulk. While the effect of nanoconfinement has been studied for several decades, the origin of the deviation is yet to be investigated and different people can observe very different effects in similar …
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Application of Polymer and Nanomaterials for Improving Heavy Oil Recovery
… decades, specifically in Canada. A major source of energy is oil extracted from underground petroleum reservoirs. Utilizing current technology and equipment, only a small portion of oil can be produced and recovered. Steam-assisted gravity drainage (SAGD), used as a common technique to produce …
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Development of analytical systems and monitoring of VOCs emissions during polymer processing
… compounds (VOCs) emissions during thermal degradation of polymers. This was used to estimate organic emissions from both virgin polymer resins and commingled plastics. The effects of process parameters, i. e., temperature, heating rate and residence time, were also studied. Significant VOCs …
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An Investigation of Polymer Support Structures In Metal Directed Energy Deposition
… (AM) processes. As a result, DED is of interest to die and mold, energy, and aerospace industries, among others. However, the design space of DED is limited: overhangs steeper than 20° and freestanding bridge geometries are typically difficult or impossible to manufacture without …
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Κατασκευή και μελέτη πολυμερικού σκυροδέματος εποξειδικής υβριδικής μήτρας ενισχυμένο με ινώδη και κοκκώδη εγκλείσματα
Κατά την διάρκεια των αμέσως προηγούμενων δεκαετιών, η οικοδομική βιομηχανία ενσωμάτωσε τα πολυμερή και τα σύνθετα υλικά πολυμερικής μήτρας στο φάσμα των μεθόδων και υλικών που χρησιμοποιεί για ένα μεγάλο αριθμό εφαρμογών. Τα υλικά πολυμερικής μήτρας μπορούν είτε να εφαρμοστούν σε υφιστάμενα …