Pyrolysis mass spectrometric analysis of styrene-isoprene-styrene copolymer

Download

index.pdf

Date

1999-01-01

Author

Hacaloğlu, Jale
Suzer, Sefik

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

41
views

0
downloads

Thermal analysis of styrene±isoprene±styrene block copolymer, using the direct pyrolysis mass spectrometry (MS) technique, indicated that each block showed very similar thermal behavior with the corresponding homopolymer. The isoprene block was found to be thermally less stable, decomposing by random scissions followed by cyclization reactions. The more stable styrene block degraded by a radical depolymerization mechanism. With an indirect pyrolysis MS technique, it was found that production of benzene, toluene, 1-methyl cyclopentene and 1-methyl cyclohexene was more e ective when degradation was carried out in a closed reactor. # 1999 Elsevier Science Ltd. All rights reserved.

URI

https://hdl.handle.net/11511/30203

Journal

European Polymer Journal

DOI

https://doi.org/10.1016/s0014-3057(98)00074-3

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

NO oxidation and NOx storage over Ce-Zr mixed oxide supported catalysts Caglar, B.; Üner, Deniz (Elsevier BV, 2011-02-10) NO oxidation and NO storage behavior of 1% Pt/10% BaO/CexZr1-xO2 (x=0, 0.25, 0.5, 0.75, 1) catalysts prepared by the Pechini method were investigated via Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) spectroscopy. DRIFTS study revealed that in the presence of Pt/BaO/Ce0.5Zr0.5O2, NO is oxidized to NO2 in the absence of gas phase O-2 at room temperature due to high oxygen mobility in the support material.
Pyrolysis mass spectrometric analysis of styrene-butadiene block and random copolymers Hacaloğlu, Jale; Ertugrul, Nergis; Fares, Muhammed M.; Suzer, Sefik (1997-01-01) rect pyrolysis mass spectrometric analysis of a styrene-butadiene-styrene block copolymer indicated that thermal decomposition of each block shows a resemblance to the related homopolymer, giving a possibility of differentiation of blocks. However, the random analog, the styrene butadiene rubber, degraded in a manner that is somewhat in between in nature of the thermal characteristics of both homopolymers. This technique shows promise to differentiate thermal behaviors of each sequence in block polymers if ...
Thermal contact conductance of nominaly flat surfaces Yüncü, Hafit (2006-11-01) The variation of thermal conductance of contact has been investigated as a function of apparent contact pressure experimentally. Experimental data has been obtained for steel, brass, copper and aluminum test pieces having different surface roughness over a wide range of contact pressures. Experimental results are compared with the theoretical predictions of an existing theory. Comparison revealed good agreement of trend with the experimental data, however, numerical values vary widely. Theory can predict th...
Thermal decomposition of polystyrene-b-poly(2-vinylpyridine) coordinated to co nanoparticles Elmaci, Ayşegül; Hacaloğlu, Jale; Kayran, Ceyhan; Sakellariou, Georgios; Hadjichristidis, Nikos (2009-11-01) Direct pyrolysis mass spectrometry analyses of polystyrene-block-poly(2-vinylpyridne), PS-b-P2VP, indicated that the thermal degradation of each component occurred independently through the decomposition pathways proposed for the corresponding homopolymers; depolymerization for PS and depolymerization and loss of protonated oligomers for P2VP by a more complex degradation mechanism. On the other hand, upon coordination to cobalt nanoparticles, thermal decomposition of the P2VP blocks was initiated by loss o...
Elucidating the Barriers on Direct Water Splitting: Key Role of Oxygen Vacancy Density and Coordination over PbTiO3 and TiO2 METE, ERSEN; Ellialtioglu, Sinasi; GÜLSEREN, Oğuz; Üner, Deniz (2021-01-01) In this work, using the state-of-the-art first-principles calculations based on density functional theory, we found that the concentration and coordination of surface oxygen vacancies with respect to each other were critical for the direct water-splitting reaction on the (001) surfaces of PbTiO3 and TiO2. For the water-splitting reaction to happen on TiO2-terminated surfaces, it is necessary to have two neighboring O vacancies acting as active sites that host two adsorbing water molecules. However, eventual...

Citation Formats

J. Hacaloğlu and S. Suzer, “Pyrolysis mass spectrometric analysis of styrene-isoprene-styrene copolymer,” European Polymer Journal, pp. 939–944, 1999, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30203.