Pyrolysis mass spectrometric analysis of styrene-butadiene block and random copolymers

Download

index.pdf

Date

1997-01-01

Author

Hacaloğlu, Jale
Ertugrul, Nergis
Fares, Muhammed M.
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

129
views

0
downloads

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 any exist. Indirect pyrolysis mass spectrometric analysis gave no clear evidence for differentiation of the nature and the composition of the copolymers.

Subject Keywords

Thermal-degradation, Inert atmosphere, Evolved-gas, Polybutadiene, Polystyrene, Polymers, Chromatography, Behavior

URI

https://hdl.handle.net/11511/30375

Journal

European Polymer Journal

DOI

https://doi.org/10.1016/s0014-3057(96)00068-7

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Pyrolysis mass spectrometry analysis of electrochemically grafted polyacrylonitrile with thiophene Oguz, Gulcan; Hacaloğlu, Jale; Önal, Ahmet Muhtar (2005-10-01) In this work, structural and thermal analyses of a polythiophene/polyacrylonitrile (PTh/PAN) sample, prepared by electrochemical polymerization of thiophene onto a poly(acrylonitrile) coated anode, have been performed by a direct insertion probe pyrolysis mass spectrometry technique. The evolution profiles of PTh based products from PTh/PAN showed nearly identical trends with those recorded during the pyrolysis of pure PTh. However, when PAN based products were considered, contrary to the trends observed fo...
Pyrolysis mass spectrometric analysis of copolymer of polyacrylonitrile and polythiophene Oğuz, Gülcan; Hacaloğlu, Jale; Department of Polymer Science and Technology (2004) In the first part of this work, the structural and thermal characteristics of polyacrylonitrile, polyacrylonitrile films treated under the electrolysis conditions in the absence of thiophene, polythiophene and the mechanical mixture and a conducting copolymer of polyacrylonitrile/polythiophene have been studied by pyrolysis mass spectrometry technique. The thermal degradation of polyacrylonitrile occurs in three steps; evolution of HCN, monomer, low molecular weight oligomers due to random chain cleavages a...
Pyrolysis mass spectrometry analysis of BF4 - doped polythiophene Gozet, Tuba; Hacaloğlu, Jale; Önal, Ahmet Muhtar (2004-06-01) Pyrolysis of electrochemically prepared BF4- doped polythiophene (PTh) by direct insertion probe and Currie point pyrolysis gas chromatography mass spectrometry techniques indicated that thermal decomposition of PTh occurs in two steps. In accordance with literature results, the first step is assigned to the loss of the dopant, and the second step to the degradation of the polymer backbone producing segments of various conjugation lengths. At elevated temperatures, detection of products such as H2S and C2H2...
alpha-Tricalcium phosphate hydrolysis to hydroxyapatite at and near physiological temperature Durucan, Caner (2000-06-01) The kinetics of hydroxyapatite (HAp) formation by direct hydrolysis of alpha-tricalcium phosphate (alpha-TCP) [alpha-Ca-3(PO4)(2)] have been investigated. Transformation kinetics were examined for reactions at 37 degrees C, 45 degrees C and 56 degrees C by isothermal calorimetric analysis. Setting times and morphologies of the resultant HAp were found to be strongly dependent on reaction temperature. XRD analysis accompanied by FTIR confirmed that phase pure calcium-deficient hydroxyapatite (CDHAp) [Ca10-x(...
THERMAL POLYMERIZATION OF BIS(TRIHALOPHENOXO)COPPER(II) COMPLEXES IN EXCESS DIMETHYLFORMAMIDE AND DIMETHYL-SULFOXIDE AS LIGANDS KISAKUREK, D; SANLI, O (1989-08-01) Thermal decomposition of bis(trihalophenoxo)copper(II) complexes was achieved at 50°C in dimethylformamide or dimethyl sulfoxide. The resulting polymers, poly(oxydihalophenylene)s (2), were characterized by FTIR, 1H NMR and 13C NMR spectroscopy and by differential scanning calorimetry. The molecular weights were determined by the vapour pressure method. Tribrominated phenol derivatives prefer 1,4‐substitution, whereas with trichlorophenol derivatives 1,2‐and 1,4‐substitutions take place at equal rates in ei...

Citation Formats

J. Hacaloğlu, N. Ertugrul, M. M. Fares, and S. Suzer, “Pyrolysis mass spectrometric analysis of styrene-butadiene block and random copolymers,” European Polymer Journal, pp. 199–203, 1997, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30375.