Characterization of polypyrrole/polytetrahydrofuran graft copolymers by direct pyrolysis mass spectrometry

Özdilek, Ceren
Toppare, Levent Kamil
Yagci, Yusuf
Hacaloğlu, Jale
The thermal decomposition pathways and products of pyrrole ended-polytetrahydrofuran (PTHF), p-toluene sulfonate doped polypyrrole (PTS-PPY) and polypyrrole/polytetrahydrofuran (PTS-PPY/PTHF) graft copolymers have been investigated by direct pyrolysis mass spectrometry (DPMS). The data suggest that PTHF degrade via mixed random cleavage and unzipping mechanism followed by hydrogen transfer reactions. Decomposition of dopant in the high temperature range is attributed to a strong interaction between the dopant and the host polymer, whereas the cleavage of the pyrrole ring and lack of high mass fragments are associated with a network structure, Furthermore. evolution of H2O and CO2 lying throughout all pyrolysis temperature range, points out the oxidation of the pyrrole units during electrolysis in aqueous media. Yet, when the trends in the characteristic polypyrrole and dopant based peaks are considered, quite high resemblance to that of pure PTS-PPY is observed. Identical products having identical time-temperature resolved ion current profiles detected at both heating rates, suggest that the thermal deradation characteristics of 9 polypyrrole and dopant are not affected by the presence of the matrix. Significant changes in the matrix-based product peaks from the copolymer spectrum are clearly identified. Such a low pyrolysis temperature, or early appearance of product peaks in the case of ballistic heating, can be directly related to a polymer of very low-molecular weight. The only possible cause for such a trend may be the degradation of the matrix itself during electropolymerization of the pyrrole. Thus, it may be proposed that the stability of PTHF chains totally change during the electrochemical syntheses.
Journal of Analytical and Applied Pyrolysis


Structural and thermal characterization of PTSA doped polypyrrole-polytetrahydrofuran graft copolymer
Özdilek, Ceren; Hacaloğlu, Jale; Toppare, Levent Kamil; Yagč, Yusuf (2004-01-06)
The thermal degradation processes of p-toluene sulfonate (PTS) doped polypyrrole (PPY) grown from the pyrrole moiety located at both the ends of polytetrahydrofuran (PTHF) have been studied by direct pyrolysis mass spectrometry (DPMS) to gain structural information. To get a better insight, pyrolysis analysis on corresponding homopolymers, PTHF and PPY, have also been carried out. The DPMS data were in accordance with TGA results indicating a significant decrease in thermal stability of the copolymer with r...
Characterization of the polymer of a dipyrrolyl monomer by pyrolysis mass spectrometry
Ertas, Merve; Hacaloğlu, Jale; Toppare, Levent Kamil (2004-08-01)
In this work, characterization of a homopolymer of succinic acid bis(4-pyrrol-1-ylphenyl) ester prepared by galvonastatic polymerization was carried out by direct pyrolysis mass spectrometry. Although decomposition of the monomer yielding mainly butadionic acid and pyrrole occurred under the galvonastatic polymerization conditions, growth of the polymer through the pyrrole moieties was also achieved, yielding a ladder-type polymer film. The polypyrrole chains contained both quinoid and aromatic units as in ...
Characterization of conducting copolymer of pyrrole via pyrolysis mass spectrometry
Levent, Anil; Hacaloğlu, Jale; Toppare, Levent Kamil (2008-03-01)
In this work, structural and thermal characterization of BF4- doped copolymer of pyrrole (PPy) with 2-methylbutyl-2-(3-thienyl)acetate prepared by electrochemical polymerization were performed via a pyrolysis mass spectrometry technique. The pyrolysis mass spectrometry data of the copolymer PPy/PMBTA, and the homopolymers; polypyrrole, PPy, and poly(2-methylbutyl-2-(3-thienyl)acetate), PMBTA were analyzed and compared. It has been determined that when the electrochemical polymerization of pyrrole was achiev...
Characterization of electrochemically synthesized p-toluene sulfonic acid doped polypyrrole by direct insertion probe pyrolysis mass spectrometry
Uyar, Tamer; Toppare, Levent Kamil; Hacaloğlu, Jale (2002-01-01)
A direct insertion probe pyrolysis mass spectrometry technique was used to perform a systematic thermal characterization of conducting polypyrrole doped with p-toluene sulfonic acid. The effect of dopant concentration on thermal stability and degradation products was investigated using undoped and dedoped polypyrrole samples. The data indicate that polymerization of pyrrole in the absence of dopant produces an aromatic structure, which transforms into the quinoid form at high dopant concentrations. Reductio...
Characterization of conducting copolymers of succinic acid bis-(-4-pyrrol-1-yl-phenyl) ester and thiophene via pyrolysis mass spectrometry
Ertas, Merve; Hacaloğlu, Jale; Toppare, Levent Kamil (2005-03-01)
In this work, a direct pyrolysis mass spectrometry technique was applied to characterize a conducting copolymer of succinic acid bis-(4-pyrrol-1-yl-phenyl) ester (SM) and thiophene prepared by electrochemical polymerization. Thermal degradation behavior of both components was quite similar to those of the corresponding homopolymers, PSM, and polythiophene PTh. Yet, detection of oligomers and mixed dimers of both monomers in the high temperature pyrolysis mass spectra confirmed the formation of a copolymer. ...
Citation Formats
C. Özdilek, L. K. Toppare, Y. Yagci, and J. Hacaloğlu, “Characterization of polypyrrole/polytetrahydrofuran graft copolymers by direct pyrolysis mass spectrometry,” Journal of Analytical and Applied Pyrolysis, pp. 363–378, 2002, Accessed: 00, 2020. [Online]. Available: