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 650 for “"Biodegradable"”.
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Biodegradable Polymeric Ion Releasing Fillers
Dental sealants are a highly effective tool used by dentists to prevent occlusal caries in children by sealing pits and fissures of molars. However, polymerization shrinkage can lead to marginal leakage and secondary caries over time. Biodegradeable polymeric ion-releasing fillers (PIRFs) …
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Biobased And Biodegradable Polymer Nanocomposites
… noncrosslinked and crosslinked biobased and biodegradable polymer nanocomposites were fabricated and characterized. The properties of these polymer nanocomposites, and their relating mechanisms and corresponding applications were studied and discussed in depth. Chapter 1 introduces the …
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Biodegradable adhesives for orthopedic surgery
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1980
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Biodegradable Thermoplastic Elastomers and Smart Composites
<p>There is a need for biodegradable thermoplastic elastomers for a variety of medical applications. This dissertation aims at (i) developing and characterizing biodegradable elastomers and (ii) developing and characterizing biodegradable smart composites, both to be used as biomaterials. First, in …
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Melting point depression in biodegradable polyesters
… decreased from 152 to 142°C . An alternative biodegradable polymer, polycaprolactone CAPA 6800 was investigated with high pressure DSC as a comparison polymer to polylactic acid. Similarly to PLA, the melting point of PCL showed a significant reduction (55 to 40°C) when soaked with increasing …
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Biodegradable polyanhydrides as drug delivery systems
Polyanhydrides are useful biodegradable vehicles for controlled 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 …
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Finishing Processes for Zein Biodegradable Films
Lamination and coating processes of zein-oleic acid films provided films with range of tensile properties, gas barrier properties, and thermal properties. The range could make zein-based films potentially useful in packaging applications for fresh produce of different respiration rates.
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Stability of proteins within biodegradable microspheres
In the past decade, biodegradable polymers have become the materials of choice for a variety of biomaterials applications. In particular, poly(lactic-co-glycolic acid) (PLGA) microspheres have been extensively studied for controlled-release protein delivery. However, significant issues arise in …
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Erosion and release from biodegradable polyanhydrides
Thesis (Ph. D.)--Massachusetts Institute of Technology, Whitaker College of Health Sciences and Technology, 1995.
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Lamination of a biodegradable polymeric microchip
… delivery. Currently, the microchip employs a nonbiodegradable sealant layer, and the new design aims to fabricate it only of biodegradable parts. Experiments were conducted to evaluate two potential designs that are fabricated via lamination, and a final design was proposed based on the results. …
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Characterization of natural fibre reinforced biodegradable composities
… are some disadvantages that restrict their use. Biodegradable polymers or biopolymers such as polylactic acid polymers (PLA) are polyesters of lactic acid, and originally made from renewable agricultural raw materials e.g. corn starch. Development of new composite products from the existing …
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Controlled drug release from oriented biodegradable polymers
… a novel method for controlling drug release from biodegradable polymers. The effect of various degrees of polymer orientation was studied in oriented Poly (L-lactic acid) (PLA) films containing curcumin and theophylline as model drugs. Additionally, direction specific drug release was studied from …
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Uniform biodegradable microparticle systems for protein delivery
… issue for protein therapeutics’ application. Biodegradable polymer devices have been utilized as a means to deliver drugs in a controlled and less invasive manner. Poly(lactide-co-glycolide) (PLG) and poly(lactic acid) (PLA) microparticles such as double-wall/monolithic microspheres and …
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Biodegradable microfluidic scaffolds for vascular tissue engineering
… applications in the context of a novel biodegradable elastomer. The field of tissue engineering and organ regeneration has been born out of the high demand for organ transplants. However, one of the critical limitations in regeneration of vital organs is the lack of an intrinsic blood …
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Blends of Biodegradable Thermoplastics With Lignin Esters
Thermoplastic blends of several biodegradable polymers with lignin (L) and lignin esters were prepared by solvent casting and melt processing. Among the biodegradable thermoplastics were cellulose acetate butyrate (CAB), poly-hydroxybutyrate (PHB), poly-hydroxybutyrate-co-valerate (PHBV), and a …
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Synthesis and Characterization of Functional Biodegradable Polyesters
The ring opening polymerization of D,L-lactide (DLLA) using multifunctional hydroxyl-terminated initiators and catalyst/coinitiator systems based on Sn(Oct)2 afforded the preparation of star-shaped, poly(D,L-lactide)s (PDLLA)s of controlled molar mass, narrow molar mass distributions, and …
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Biodegradable food packaging using agricultural wastes (Banana Pseudostem)
Biodegradable food packaging has been developed in this research from banana pseudostem. The research can be divided into three phases. The first phase was to explore the possible method to isolate nanocellulose from banana pseudostem as the main polymer for bioplastic formation. Alkaline …
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