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The Global ETD Search service is a free service for researchers
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 141 to 150 of 2418 (0.014 seconds)| 141 |
The mechanism of the ring-opening polymerization of ε-caprolactone using tin(IV) carboxylatesBassi, Mitchell Brian, 1963- January 1987 (has links)
The polymerization of epsilon-caprolactone using tin(IV) carboxylates has been investigated and related to literature research. Polymers with broad MWD were obtained in quantitative yield. At 100% conversion polymer molecular weights ranged from 50,000 to almost 60,000. After an initial induction period, the polymerization shows zero order kinetics with respect to monomer and near first order kinetics with respect to catalyst. The mechanism of the polymerization is coordination-type, and is dependent on the presence of water or an alcoholic initiator. Added water decreases polymer molecular weight to approx. 30,000 at 100% conversion. The polymer has a terminal hydroxyl group and a terminal carboxyl group. The hydroxyl end is the reactive end in propagation. The carboxyl end and free carboxylic acid produced by the hydrolysis of the catalyst are responsible for the induction period.
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| 142 |
Synthesis of π-conjugated polymers via Suzuki cross-coupling polymerizationElmalem, Einat January 2013 (has links)
No description available.
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| 143 |
Investigating the molecular mechanism of serpin polymerisationSendall, Timothy James January 2012 (has links)
No description available.
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| 144 |
Rheological studies in extrusion technologyTorres Becerra, Rosalia, 1946- January 1971 (has links)
No description available.
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| 145 |
I, Synthesis and polymerization of nortricyclene derivatives ; II, 1:1 alternating copolymers of bicyclobutanesRhoades, James Wesley, 1947- January 1971 (has links)
No description available.
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| 146 |
Study of the synthesis of dimethyl 1, 3-butadiene-1, 3-dicarboxylate and 1, 3-butadiene-1, 3-dicarbonitrileYacoubi, Ahmed, 1949- January 1977 (has links)
No description available.
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| 147 |
Intensive mixing of thermoplastic polymers in uni-rotor systemsHyatt, Harry James, 1937- January 1961 (has links)
No description available.
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| 148 |
Plasticating extruder as reactor for polymerizing spandex polyurethanesMartens, Marvin Michael, 1951- January 1975 (has links)
No description available.
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| 149 |
Group 4 Metal Complexes with Ferrocenyl AmidinatesMultani, Kanwarpal 20 March 2012 (has links)
Bis(amidinate) dichloride complexes of the type M(L)2Cl2 (M=Zr, 2a; M=Ti, 2b; L=CyNC(C5H5FeC5H4)NCy) were synthesized by treating 2 equiv of ferrocenyl amidine, H(L), with M(NMe2)2Cl2 (M=Ti, Zr.2THF). Half sandwich mono(amidinate) complexes, Cp’ZrLCl2 (Cp’=Cp, 2c; Cp’=Cp*, 2d), were prepared by the reaction of Cp’ZrCl3 with 1 equiv of Li(L). The dialkyl complexes, M(L)2Me2 (M=Zr, 3a; M=Ti, 3b), CpZr(L)(CH2Ph)2 (3c) and Cp*Zr(L)Me2 (3d) were prepared by treatment of the dichloride complexes (2a-2d) with an appropriate alkylating agent. The dichloride complexes (2a-2d) activated with MAO, and dialkyl complexes (3a-3d) activated with B(C6F5)3 and [Ph3C][B(C6F5)4] show low to moderate ethylene polymerization activities. Cyclic voltammetry studies on the metal complexes containing ferrocenyl amidinates reveals quasi reversible oxidation and reduction waves for the ferrocene/ferrocenium couple.
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| 150 |
Group 4 Metal Complexes with Ferrocenyl AmidinatesMultani, Kanwarpal 20 March 2012 (has links)
Bis(amidinate) dichloride complexes of the type M(L)2Cl2 (M=Zr, 2a; M=Ti, 2b; L=CyNC(C5H5FeC5H4)NCy) were synthesized by treating 2 equiv of ferrocenyl amidine, H(L), with M(NMe2)2Cl2 (M=Ti, Zr.2THF). Half sandwich mono(amidinate) complexes, Cp’ZrLCl2 (Cp’=Cp, 2c; Cp’=Cp*, 2d), were prepared by the reaction of Cp’ZrCl3 with 1 equiv of Li(L). The dialkyl complexes, M(L)2Me2 (M=Zr, 3a; M=Ti, 3b), CpZr(L)(CH2Ph)2 (3c) and Cp*Zr(L)Me2 (3d) were prepared by treatment of the dichloride complexes (2a-2d) with an appropriate alkylating agent. The dichloride complexes (2a-2d) activated with MAO, and dialkyl complexes (3a-3d) activated with B(C6F5)3 and [Ph3C][B(C6F5)4] show low to moderate ethylene polymerization activities. Cyclic voltammetry studies on the metal complexes containing ferrocenyl amidinates reveals quasi reversible oxidation and reduction waves for the ferrocene/ferrocenium couple.
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