Mona Hassan Mohammed Abd Elrehim

Synthesis and characterization of hyperbranched poly(urea-urethane)s

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Kurzfassung in Englisch

The thesis aims to synthesize hyperbranched poly(urea-urethane) polymers (HPU) in one-pot method using commercially available monomers which are 2,4-toluylene diisocyanate (TDI) as aromatic diisocyanate and isophorone diisocyanate (IPDI) and 2(3-isocyanatopropyl) cyclohexylisocyanate (IPCI) as aliphatic diisocyanates. Those proposed diisocyanates were reacted with diethanolamine (DEA) or diisopropanolamine (DIPA). Conditions of polymerisation reactions were optimised. Complete structural analysis using 1H and 13C NMR for the obtained aromatic polymers was carried out. Degree of branching up to 70% was calculated. Aliphatic polymers have spectra with overlapped signals therefore, no full structural analysis was possible. Molar masses were determined using SEC/RI detector which shows that the prepared polymers have Mw values between 1600 g/mol and 106000 g/mol. Thermal analysis for different polymer systems showed that aliphatic HPU are more thermally stable and have values of glass transition temperature higher than aromatic ones. Modification of the end groups in the prepared hyperbranched polymers was carried out using three different modifiers and degree of modification up to 100%. Linear polymers based on the same diisocyanate monomers were prepared to compare the properties of hyperbranched systems with their linear analogs. Measurements of solution viscosity showed that HPU have lower solution viscosity values than their linear analogs of comparable molar masses. Rheological measurement of some polymer samples of different systems were carried out and showed that our hyperbranched systems exhibit a more elastic behavior than the linear polymers. Surface studies for thin films prepared from different polymer systems (hyperbranched, linear and modified) were carried out and the obtained thin films were characterized using light microscope, microglider, GC-MS, and AFM. Contact angle measurements showed that HPU have a relatively hydrophilic character. The modified polymers have higher contact angle values than the unmodified ones due to the lack of OH end groups. Networks based on aliphatic and aromatic HPU were prepared through the reaction of HPU with trimer of 1,6-diisocyanatohexane and characterised by DSC, GC-MS, DMA and AFM. The domain size in aromatic networks was found to be larger than in aliphatic networks. Tensile test was carried out and it was found that aliphatic network is more elastic than aromatic one.

weitere Metadaten

übersetzter Titel
(Deutsch)
Synthese und Charakterisierung von Hochverzweigte Poly(harnstoff-Urethan)en
Schlagwörter
(Deutsch)
Beschichtung, Charakterisierung, Hochverzweigte Polymere, Oberflächeneigenschaften, Polyurethan, Strukturanalyse
Schlagwörter
(Englisch)
Characterization, Coatings, Hyperbranched polymers, Polyurethane, Structural analysis, Surface properties
SWD SchlagworteBeschichtung, Oberflächeneigenschaft, Polymere, Polyurethane, Strukturanalyse
DDC Klassifikation540
RVK KlassifikationVK 8007
Institution(en) 
InstitutionTechnische Universität Dresden
AbteilungMathematik und Naturwissenschaften, Chemie, Institut für Polymerforschung Dresden e.V.
BetreuerProf. Dr. B. Voit
GutachterProf. Dr. H. Frey
Prof. Dr. B. Voit
Prof. Dr. H.-J. Adler
DokumententypDissertation
SpracheEnglisch
Tag d. Einreichung (bei der Fakultät)07.06.2004
Tag d. Verteidigung / Kolloquiums / Prüfung16.07.2004
Veröffentlichungsdatum (online)29.06.2004
persistente URNurn:nbn:de:swb:14-1091096011203-44194

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