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 19 of 19 for “"Polycarbonates"”.
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Triptycene side unit effects on compressive yield strength in polycarbonates
Polycarbonates have long been studied for their excellent mechanical toughness. Adding side units to polycarbonate could increase physical properties of the polymer. The role of triptycene in polycarbonate was studied by adding a low concentration of triptycene-containing polymer chains, and using …
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Crystallization studies of liquid crystalline polycarbonates based on substituted stilbene mesogen
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Osteogenic differentiation of human mesenchymal stem cells on thin film tyrosine derived polycarbonates
… onto the surface. A library of tyrosine derived polycarbonates allows the tailoring of material properties to suit specific cell response by varying the structure of the polymer at the pendent chain and the incorporation of PEG in the backbone. Increasing pendent chain length increases the …
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The effect of free volume on the radiation acceleration of creep in polycarbonates.
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1967
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In vitro evaluation of human mesenchymal stem cell neural differentiation on tyrsine-derived polyarylates and polycarbonates
… of the polymer surface of tyrosine-derived polycarbonates and polyarylates on MSC differentiation along the neural lineage were investigated in this research. These polymers were developed by Dr. Joachim Kohn, where by altering the length of the alkyl ester pendent chain and the backbone …
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DESIGNING ANTI-PDL1 ANTIBODY CONJUGATED POLYMERIC COACERVATES AS A NOVEL “NANO-IMMUNOTHERAPY” AGAINST HEPATOCELLULAR CARCINOMA
… to deliver encapsulated cationic polycarbonates for induction of immunogenic cell death and conjugated anti-PDL1 antibodies for immune checkpoint inhibition against murine hepatomas was thus designed. Several crucial insights have been gleaned which provide a roadmap for the …
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Design of Mixed-Solvent Extraction and Size-Exclusion Simulated Moving Bed Chromatography to Recover Valuable Compounds from Electronic Waste
More than one million tons of polycarbonates and over 500,000 tons of flame retardants are consigned to landfills each year in the form of waste electrical and electronic equipment. Electronic waste is the fasting growing waste steam at a rate of 3-5% per year. Two separation processes are …
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Reversibly Photo-Crosslinkable Polycarbonate-Based Polymersomes for Drug Encapsulation and Delivery
… of cinnamoyl and coumarin functionalized polycarbonates was compared and coumarin was identified as the more effective crosslinking agent when using 300-400 nm UV. An investigation of the photo-reversibility of the coumarin dimerization revealed no discernible change in the properties of …
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Variable Pressure Nuclear Magnetic Resonance Studies of Ionic Liquids and Electrophoretic Probe Design
… In this work, studies of ionic liquids and polycarbonates are presented and the design and fabrication of cells used in the study of NMR under an electric field. </p>
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Novel molecular architectures from iptycene polymers
… of introducing this property into polyesters and polycarbonates. Two specific novel inter-chain interactions were established: molecular threading and molecular interlocking. These steric interactions between polymers chains generate a non-bonded, network morphology and actively enhance the …
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A Novel Process to Create Arbitrary Microcellular Patterns in Polycarbonate using a Laser Beam
… method allows local heating of CO2 saturated polycarbonates which results in the creation of arbitrary shapes of microcellular foamed regions in a plastic part. We present the processing parameters required to create foams in polycarbonate sheets that were saturated with carbon dioxide at …
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New CO₂ chemistry for fine chemical synthesis
… urea, inorganic carbonates, salicylic acid, and polycarbonates, yet this is still miniscule compared to the immense potential that is still yet to be harnessed in using this versatile building block. This thesis discusses how a novel methodology was developed for synthesising a benzotriazole (Bt) …
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An in vitro evaluation of tyrosine derived polyarylates and polycarbonate as polymeric scaffold for human mesenchymal stem cells osteogenic differentiation
… for selecting materials as potential scaffolds. Polycarbonates and polyarylates have combinatorial libraries that exhibit a range of surface chemistries leading to changes in the surface properties such as wettability, rigidity and protein adsorption. Structural modifications of their pendant …
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Monomer synthesis and polymer pyrolysis
… the preparation of novel poly(arylene ethers), polycarbonates, and polyesters. Bis(4-hydroxy-3- aminophenyI)-1-phenyl-2,2,2-trifluoroethane [3F-bis(aminophenol)] has recently been successfully prepared from 3F-phenol. Soluble, high glass transition temperature, fully-cyclized polybenzoxazoles …
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TOOLS AND STRATEGIES FOR THE SYNTHESIS OF PHARMACEUTICAL ACTIVE COMPOUNDS
… These can subsequently be advanced to polycarbonates through organocatalytic ring-opening polymerization (ROP), allowing for a controllable amount of the drug in the resulting polymer-drug conjugates. Preliminary depolymerization studies conducted by Arjan Kleij’s research group …
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Design of Functional Polymeric Micelles as a Carrier for Anticancer Drug Delivery
Polymeric micellar nanoparticles are frequently utilized as drug delivery carriers due to their particular core/shell structure, ease of functionalization, sustained circulation in the blood and its ability to passively accumulate in leaky tumor tissues. Two important factors that should be …
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Investigation of the optical, thermal, and mechanical properties of a bulk polymer using the surface thermal lensing technique
<p>The sensitive and simple photothermal technique of Surface Thermal Lensing (STL) was employed to study the thermo-mechanical response of an amorphous polycarbonate as a bulk. A discussion is given of how previously developed theories did not fit well with the present work. Therefore, only …