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 16 of 16 for “"interpenetrating polymer network"”.
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Thermally-responsive interpenetrating polymer network nanoparticles as intelligent therapeutic systems
Thermally-responsive interpenetrating polymer network (IPN) nanoparticles, composed of polyacrylamide, poly(acrylic acid), poly(methacrylic acid), poly(2-ethylacrylic acid), and poly(2-propylacrylic acid), were synthesized using a sequential inverse emulsion polymerization technique. These …
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Characterization of the Viscoelastic Fracture of Solvated Semi-Interpenetrating Polymer Network Silicone Hydrogels
… and fracture behavior of two solvated semi-interpenetrating polymer network silicone hydrogel systems. Viscoelastic characterization of these material systems was performed by implementing a series of uniaxial tension and dynamic mechanical analysis shear tests in order to generate relevant …
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Photo-Curing Behavior and Thermal Properties of Silicone Semi Interpenetrating Polymer Network (Semi-IPN) Organogels
… fracture properties of silicone semi-interpenetrating polymer network organogels. Curing time may affect the extent of reaction and the crosslink density of a gel network. In order to investigate the effect of this parameter, materials were photo-cured for different times within the …
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Characterization of the Interfacial Fracture of Solvated Semi-Interpenetrating Polymer Network (S-IPN) Silicone Hydrogels with a Cyclo-Olefin Polymer (COP)
… the adhesion between two different solvated semi-interpenetrating polymer network (S-IPN) silicone hydrogels and a cyclo-olefin (COP) polymer through experimental, analytical, and numerical methods. Interfacial fracture data was collected through the application of the wedge test, a relatively …
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A dressing solution for burn wounds: antibacterial and low-adherent wound dressings
… terephthalate)) substrates by an IPN (interpenetrating polymer network) method. The modified PET is effectively antibacterial and the surface is significantly less adherent than untreated PET. However, silver-resistant bacteria become a potential problem. Thus, ionic …
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Biomasses for the obtainment of new functional polymer materials
… of work dedicated to the development of new polymeric systems based on the use of raw materials derived from biomasses. Biomasses are a very versatile renewable energy source with low environmental impact and are less expensive than the resources deriving from petroleum. Furthermore, the use …
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Development of an Adhesive Emulsion Hydrogel for Soft Tissue Reconstruction
… environment. Cellulose is the most abundant biopolymer on Earth and its derivatives have been approved by the FDA for use in a multitude of food, cosmetic, and biomedical products. Methylcellulose (MC), an amphiphilic cellulose derivative, may be methacrylated to produce injectable, …
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Aspects of Wood Adhesion: Applications of 13C CP/MAS NMR and Fracture Testing
Phenol Formaldehyde (PF) and polymeric isocyanate (pMDI) are the two main types of adhesives used in the production of structural wood-based composites. Much is unknown about various aspects of adhesion between these two types of resins and wood. The present research describes the development of …
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Improving hydrophilicity of silicone elastomer by IPN formation with hyaluronan
… bulk. The aim of this research was to create an interpenetrating polymer network (IPN) materials of poly(dimethyl siloxane) (PDMS) and hyaluronan (HA) with such properties. The results in this work indicate the successful synthesis of these HA-PDMS IPN materials. These elastomeric materials had …
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Molecular investigation of the wood/pMDI adhesive bondline
Polymeric diphenylmethane diisocyanate, pMDI, has become an important wood binder in recent years, due to its excellent performance in wood-based composites. However, much still remains unknown about the nature of their bonding mechanism. This research describes efforts to learn more molecular …
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ATR-FTIR spectroscopy and Raman microscopy studies of organosilane diffusion and hydrolysis in PVC films.
… widely used to bond organic materials such as polymers to inorganic materials in polymer composites. However, the mechanism of adhesion is poorly understood. One postulated mechanism is the interdiffusion of the silane and polymer, along with condensation of the silane to form an …
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The design, synthesis and characterization of chitosan-based interpenetrating polymer networks and thin film systems
Chitosan is a polymer derived from naturally-abundant sources of chitin and can be seen referred to in the literature for a wide variety of applications. However, it has its limitations due to lack of strength and stability as a single polymer structure. This problem can be overcome by …
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Shape Memory Assisted Self Healing (Smash) Polymeric and Composite Systems
… memory (SM) effect to aid self healing (SH) polymeric systems that are able to simultaneously close and re-bond cracks with a single thermal stimulus. This new concept is termed shape memory assisted self healing (SMASH). Additionally, a new type of shape memory termed reversible plasticity …
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Development of Cellulose-Based, Semi-Interpenetrating Network Hydrogels as Tissue-Adhesive, Thermoresponsive, Injectable Implants
… Development of Cellulose-Based, Semi-Interpenetrating Network Hydrogels as Tissue-Adhesive, Thermoresponsive, Injectable Implants</strong></p> <p>Hydrogels are three-dimensional polymer networks with high water content and tunable mechanical properties, which have been widely …
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Green composites from castor oil and renewable reinforcing materials: maleated castor oil-polystyrene matrix reinforced with greige fibre
… to find biodegradable alternatives for common polymer materials has risen due to the increase in pollution (soil and water) and the effects that it has on the ocean and wildlife. Alternatives can be found by turning to plant-based oils, for example castor oil, to be used in the synthesis of a …
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Synthesis and characterisation of polyamide 6 blends made by reactive extrusion
Continuous anionic polymerisation of catalysed E -caprolactam has been undertaken on an intermeshing co-rotating twin-screw extruder for the preparation of polyamide 6. An optimised extruder screw and barrel configuration was used during reactive extrusion process to permit necessary feeding, …