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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the 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 31 to 40 of 194 (0.016 seconds)
31

Development of inhibitors based on organic-inorganic hybrid materials via sol-gel process

Li, Yi-chun 04 July 2006 (has links)
Oligomers of hard and soft segments of unsaturated polyesters (UP) were synthesized. They were blended in different ratios and cured with various amounts of styrene. Based on the criteria of tensile strength and strain, hard segment/soft segment (60/40 wt %) UPs containing 35 wt % and 45 wt % of extra amount of styrene were chosen for further studies. Inorganic-organic hybrid materials were prepared by incorporating tetraethoxysilane and poly(dimethylsiloxane) into the UP resins via the sol-gel process by changing the ratios of HCl/TEOS, H2O/TEOS, TEOS/PDMS and the reaction time. The specimens of these hybrid materials after curing were characterized using the tensile tester, rheometer, scanning electron microscope (SEM), 29Si-NMR and thermogravimeter. In the condition of HCl/TEOS molar ratio 0.07, H2O/TEOS molar ratio 4, TEOS/PDMS weight ratio 90/10 and the reaction time 3 hours, the results of 29Si-NMR, SEM and silicone mapping indicate that these silica gels with 3D network were well dispersed in the UP resins. These specimens had tensile strength of 512¡Ó16 kgf/cm2 and elongation of 11¡Ó4 % which are above the criteria of inhibitors. From the erosion testing, flame retardants was added unsaturated polyester and inorganic-organic hybrid materials that can help to resist heat flame, remain of a fire on the surface had the char forming.
unsaturated polyesters
sol-gel process
tensile test
32

Nouvelles stratégies d'hydrophobation de matériaux à base d'amidon plastifié

Bélard, Laurent Averous, Luc. January 2007 (has links) (PDF)
Reproduction de : Thèse doctorat : Chimie des matériaux : Reims : 2007. / Titre provenant de l'écran titre. Bibliogr. p. 174-188.
33

Contribution à la modélisation, à l'identification et à la simulation d'un procédé de teinture des microfibres de polyester

Park, Keun Hoo Koncar, Vladan January 2005 (has links)
Reproduction de : Thèse de doctorat : Instrumentation et analyses avancées : Lille 1 : 2004. / N° d'ordre (Lille 1) : 3447. Résumé en français et en anglais. Titre provenant de la page de titre du document numérisé. Bibliogr. p. 154-170.
34

Synthesis of poly-9, 10-dihydroanthracene-dicarboxamides via anthraquinobisketene and 9, 10-dihydroanthrancene-diacid chloride

Cramer, Randall John January 1980 (has links)
No description available.
Ketine -- Testing.
Polyamides -- Synthesis.
Polyesters -- Synthesis.
35

Anthracene containing polyesters : Homopolymers, copolymers and chain extension via Diels-Alder reactions

Kriegel, Robert Michael 05 1900 (has links)
No description available.
Polyesters Mechanical properties
Anthracene
Diels-Alder reaction
36

Fiber spinning, structure and properties of poly(ethylene terephthalate-co-4,4' bibenzoate) copolyester fibers

Ma, Hongming January 2001 (has links)
No description available.
Polyethylene terephthalate
Fibrous composites
Polymers
Polyesters
37

A design algorithm for continuous melt-phase polyester manufacturing processes optimal design, product sensitivity, and process flexibility.

Calmeyn, Timothy Joseph. January 1998 (has links)
Thesis (Ph. D.)--Ohio University, March, 1998. / Title from PDF t.p.
38

Synthesis and characterization of low-melting thermotropic liquid crystalline poly(ester-imide)s /

Jacob, Sunny. January 1994 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 1994. / Typescript. Includes bibliographical references (leaves 118-124).
39

The preparation and testing of novel biodegradable surfactants using poly(lactic acid) as the backbone, by a one-step ring opening polymerisation reaction /

Hill, Gavin T. H. January 2008 (has links)
Thesis (Ph.D.) - University of St Andrews, January 2009. / Thesis and abstract restricted until 7th January 2014.
40

Étude paramétrique de la réticulation des polyesters insaturés par micro-ondes.

Maassarani, Abdul Hamid Azmi, January 1900 (has links)
Th. doct.-ing.--Physico- chim. des matér.--Toulouse--I.N.P., 1980. N°: 81.

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