Mechanical and thermal properties of thermotropic liquid crystalline copolyester (tlcp) and its mixtures with poly(ethyleneterephthalate) and denture base poly(methyl methacrylate)

Download

index.pdf

Date

2004

Author

Öztürk, Hale Bahar

Metadata

Show full item record

Item Usage Stats

173
views

103
downloads

In this study, the thermal and mechanical properties of poly(ethylenetheraphthalate) (PET)-thermotropic liquid crystal polyester (TLCP), mixtures and poly(methyl methacrylate) (PMMA)-TLCP mixtures were studied. The curing of PMMA-TLCP mixtures was done by heat, gamma radiation and microwave. The amount of TLCP in mixtures was % 0.5, 2 and 5 TLCP by weight. TLCP was synthesized by melt-acidolysis system, and PET-TLCP mixtures were prepared by using lab scale batch mixer. PMMA samples were prepared according to denture manufacturer̕s procedure. The characterization of polymer samples and mixtures were carried by FT-IR, NMR, DSC, DMA, tensile, impact, three point bending tests and light microscopy. The mixing of TLCP with PMMA yielded heterogeneous dispersions. This was observed from light micrographs. The mechanical and rheological properties of all polymers were not positively affected by inclusion of TLCP. It is also worthwhile to note that weakening of PET-TLCP mixtures were due to the thermal degradation as the thermal age of the mixtures is much higher.

URI

http://etd.lib.metu.edu.tr/upload/12605205/index.pdf
https://hdl.handle.net/11511/14240

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Mechanical and microstructural evaluations of hot formed titanium sheets by electrical resistance heating process Ozturk, Fahrettin; Ece, Remzi Ecmel; Polat, Naki; Koksal, Arif; Evis, Zafer; Polat, Aytekin (Elsevier BV, 2013-08-20) In this study, effect of temperature in the electrical resistance heating process on mechanical properties and microstructures of commercially pure titanium grade 2 (CP2) and Ti-6Al-4V (T64) alloy sheets was investigated. Sheets were successfully heated by the electric resistance heating process, and their mechanical properties and microstructures were evaluated. Ductilities of both materials were increased significantly after 400 degrees C. Results indicate that no significant change was observed in grain ...
Electrical transport, optical and thermal properties of polyaniline-pumice composites YILMAZ, KORAY; Akgoz, A.; Cabuk, M.; Karaagac, H.; KARABULUT, ORHAN; YAVUZ, Mustafa (2011-11-01) In this study, electrical conductivity, photoconductivity, absorbance and thermal properties of polyaniline (PANI) and polyaniline-pumice composites were investigated. Temperature dependent conductivity and photoconductivity measurements were carried out in the temperature range of 80-400K. The measurements revealed that the dominant conduction mechanisms in polyaniline and 15% pumice doped composite were hopping conduction. The low activation energies calculated for 36% pumice doped composite indicated tha...
Mechanical, electrochemical and biocompatibility evaluation of AZ91D magnesium alloy as a biomaterial Tahmasebifar, Aydin; KAYHAN, Said Murat; Evis, Zafer; Tezcaner, Ayşen; Cinici, Hanifi; Koc, Muammer (2016-12-05) In this study, the effect of manufacturing conditions (i.e. compaction pressure, sintering temperature and time) on physical, mechanical and electrochemical properties of Mg alloy discs were investigated. The main motivation of this study was to achieve the manufacturing of porous and micro-surface textured Mg-based biomedical implants with good mechanical and electrochemical properties. A Box-Behnken and Full Factorial experimental design was used in experimental investigations. Relative densities of the f...
Mechanical properties of soft liner-poly(methyl methacrylate)-based denture material Usanmaz, Ali; Latifoglu, MA; Dogan, A; Akkas, N; Yetmez, M (Wiley, 2002-07-18) In this study, the mechanical properties of two different permanent soft lining materials and their bonding to poly(methyl methacrylate) (PMMA) were compared. Both of the soft liners were heat-cured commercial materials. The polymerization was carried out by conventional methods suggested by manufacturer, and the curing was done at the temperature of boiling water for 5, 15, 25, and 35 min. The sample groups were tested in the computer-aided tensile-testing machine at a rate of 2 mm/min. The slow rate helps...
Thermal degradation of polysiloxane and polyetherester containing benzoxazine moieties in the main chain Bagherifam, Shahla; Kışkan, Barış; Aydogan, Binnur; Yagci, Yusuf; Hacaloğlu, Jale (2011-01-01) In this study investigation of thermal characteristics of polysiloxane and polyetherester containing benzoxazine moieties in the main chain was performed via pyrolysis mass spectrometry. Pyrolysis mass spectrometry analyses revealed that the thermal stability and the extent of cross-linking enhanced when the benzoxazine moieties were separated by thermally more stable units such as siloxanes. However, when the siloxane chain units were long, possibility of polybenzoxazine growth decreased significantly and ...

Citation Formats

H. B. Öztürk, “Mechanical and thermal properties of thermotropic liquid crystalline copolyester (tlcp) and its mixtures with poly(ethyleneterephthalate) and denture base poly(methyl methacrylate),” M.S. - Master of Science, Middle East Technical University, 2004.