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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 90 for “"gel permeation chromatography"”.
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Block copolymer characterization by gel permeation chromatography
… to determine this kind of information was Gel Permeation Chromatography, because, since its introduction in 1964, it has become the most powerful tool for the rapid characterization of homopolymers. The proposed method is introduced by considering a dual-approach: composition distribution …
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Analysis of heavy paraffinic Fischer-Tropsch waxes using gel permeation chromatography
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1983.
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Synthesis of polymers and copolymers of lactide through titanium initators
… The polylactides were fully characterised using gel permeation chromatography and 1H and 13C NMR spectroscopy. NMR spectroscopy was carried out in the study the reaction mechanisms. Kinetic studies of the ring opening polymerisation of lactide with titanium alkoxide initiators were also conducted …
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ΜΕΛΕΤΗ ΤΩΝ ΜΕΤΑΠΤΩΣΕΩΝ ΤΩΝ ΜΑΚΡΟΜΟΡΙΑΚΩΝ ΑΛΥΣΙΔΩΝ ΣΤΗΝ ΠΕΡΙΟΧΗ ΤΩΝ ΣΥΝΘΗΚΩΝ Θ
… PHENOMENA HAVE BEEN VERIFIED BY THE TECHNIQUE OF GEL PERMEATION CHROMATOGRAPHY WHICH HAS BEEN USED FOR THE FIRST TIME. THIS METHOD REQUIRES VERY SMALL AMOUNT OF SAMPLE AND MAY PROVE USEFUL IN THE STUDY OF TRANSITIONS OF BIOPOLYMERS.
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Test Development and Material Characterization of Hot Poured Crack Sealant at Low Temperature
… scanning electron microscopy (ESEM), gel-permeation chromatography (GPC), Fourier-transform infrared spectroscopy (FTIR), and thermo-gravimetric analysis (TGA). These techniques reveal the composition of sealant as well as the interaction between the components and are used to assist …
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Characterization of aged polymer modified asphalt cements for recycling purposes
… concentration of polymer in asphalt cements by gel permeation chromatography (GPC). Infrared spectrographic, thermogravimetric and rheological techniques were used to identify changes in the binder components as a result of aging. The impact of the extraction and recovery process on binder …
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Alkylation of rat lens crystallins with iodoacetamide
… (50 millimolar excess) immediately followed by gel-permeation chromatography yielded a crystallin population devoid of βH-crystallin. This result occurred in lens homogenates from both young (100 g) and older (400 g) male rats. BetaH-crystallin was not converted to insoluble protein with …
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Chemical and Chromatographic Studies on Dimeric Fatty Acids (Heated Fats)
… Effective chromatographic systems including gel permeation chromatography, high performance size exclusion chromatography, gas liquid chromatography, high performance liquid chromatography and thin layer chromatography were developed in order to identify and isolate dimer present in an …
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The Synthesis and properties of functionalised polymers
… The materials were then characterised by gel permeation chromatography and nuclear magnetic resonance spectroscopy and cast as films for determination of their activities as nlo materials using a Nd/YAG laser system. The second harmonic intensity of each was measured relative to quartz. …
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POLYCYCLIC POLYAMINES: SYNTHESIS AND CONFORMATIONAL ANALYSIS
… intermediates were purified by preparative gel permeation chromatography (GPC). The modification of a Waters 200 analytical GPC unit are described as are the column packing procedures for preparative GPC columns.</p>
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Chemical vapor deposition of functionalized isobenzofuran polymers
… temperature not exceeding 6000C. However, gel permeation chromatography(GPC) measurements of the pentafluorophenolate ester films show only marginal polymerization. On the other hand, the alkyne films appear crosslinked and showed defect formation. Films deposited at ambient temperature …
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Synthesis and characterization of poly (butyl vinyl ether) homopolymers and copolymers utilizing the aluminum hydrogen sulfate catalyst system
… reveals that these polymers are semicrystalline. Gel permeation chromatography characterization and intrinsic viscosity data of poly(butyl vinyl ether), and poly{butyl vinyl ether-2-chloroethyl vinyl ether) homopolymers and copolymers indicate fairly narrow polydispersities, and very high …
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Synthesis and characterization of poly-(p-phenylene pyromellitamic acid)
… thermal analysis; vapor pressure osmometry; and gel permeation chromatography"--Abstract, page ii.</p>
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The cationic ring-opening polymerization of cyclic ethers
… to the overall termination differs markedly. The Gel permeation chromatography studies showed that the molecular weight distribution of the samples of polyoxetanes were bimodal. This was in accordance with previous work establishing that the cyclic tetramer is found in much higher proportions than …
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Interactions of ATP, ADP and magnesium ion with rubisco activase and their effects on rubisco activation
… the enzyme-Mg-ADP complex (340 kDa) measured by gel permeation chromatography. Analysis of the initial catalytic rates of the enzyme indicated that aggregation of the rubisco activase-Mg-ATP complex was required for both ATP hydrolysis and rubisco activation.
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Analytical studies of the degradation of cellulose nitrate artefacts
… of the artefacts was carried out, using ion chromatography, xray fluorescence spectroscopy and atomic absorption spectroscopy, to identify compositional differences between samples, which may relate to degradation. The results of these studies suggested that residual sulphate in the plastics …
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Structural characterization and bacterial degradation of marine carbohydrates
… gases (C02, H2, CH4, H2S) were monitored by gas chromatography, and carbohydrate substrates and intermediates were separated and quantified via gel-permeation chromatography and high-pressure liquid chromatography. The transfer of carbon from substrates through to end products was followed …
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Raft Polymerization Of Ph-Responsive, Diblock Copolymers For Nucleic Acid Delivery Vehicles
… efficacy. Means of characterization included gel permeation chromatography (GPC), dynamic light scattering (DLS), electrophoresis, and in vitro gene expression and toxicity studies. As a result from this study, our findings indicate the significance of cationic group functionalization on siRNA …
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Functional polymers for biomedical application : synthesis and applications
… were characterised by infra red spectroscopy, gel permeation chromatography and in the case of aqueous soluble polymers by potentiometric titration. Thin films of poly (lysine ethyl ester isophthalamide) plasticised with poly (caprolactone) were cast from DMSO/chloroform solutions and their …
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Mononuclear and Dinuclear Complexes of Allylated alpha-Diimines as Catalysts for the Polymerization of Ethylene
… Ti. The produced polyethylenes were analyzed via gel permeation chromatography (GPC). The GPC results showed broad molecular weight distributions due to the dual sites of these catalysts. The GPC spectrum of polyethylene produced with the dinuclear catalyst 13 was discussed as an example and …
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