Pyrolysis of of poly(methy methacrylate) copolymers

2015-05-01
Ozlem-Gundogdu, Suriye
Gurel, Evren Aslan
Hacaloğlu, Jale
In this work, thermal degradation of copolymers of poly(methy methacrylate) namely, poly(methyl methacrylate-co-n-butyl acrylate), P(MMA-co-nBu), poly(methyl methacrylate-co-n-benzyl methacrylate) P(MMA-co-BzMA, and poly(methyl methacrylate-co-isobornyl acrylate), P(MMA-co-IBA) were investigated via direct pyrolysis mass spectrometry. It was determined that whether an available gamma-H with respect to the carbonyl groups is present or not determines the thermal degradation mechanisms of polyacrylates and polymethacrylates. Cis elimination reactions become preferential as the first step of thermal decomposition and lead to a multi-step degradation mechanism involving trans-esterification reactions together with elimination of molecules such as alcohols, CO2, CO and H2O if gamma-Hs to the carbonyl group is present. On the other hand, if there is no gamma-H, thermal degradation proceeds by depolymerization yielding mainly the corresponding monomer. Consequently, PMMA and PBzMA decompose by depolymerization mechanisms and in contrast, thermal degradation of PnBA, and PIBA occurs through various reaction pathways involving random chain scissions, cis-elimination and trans-esterification reactions and elimination of CO2 and CO.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS

Suggestions

Pyrolysis mass spectrometry analysis of thiophene capped poly(methyl methacrylate) and poly(methylthienyl methacrylate)
Hacaloğlu, Jale; Toppare, Levent Kamil (2003-06-01)
The thermal degradations of thiophene-capped poly(methyl methacrylate) and poly(methylthienyl methacrylate) were studied via direct pyrolysis mass spectrometry. No significant effect of heating rate on the thermal degradation behaviors of the polymers under investigation have been observed in the heating range studied. It has been determined that thermal degradation of thiophene-capped poly(methyl methacrylate), (TPMMA) mainly yields monomer as in the case of pristine poly(methyl methacrylate). An analogous...
Pyrolysis of poly(phenylene vinylene)s with polycaprolactone side chains
Nur, Yusuf; Çolak, Demet; Cianga, Ioan; Yagci, Yusuf; Hacaloğlu, Jale (2008-05-01)
The thermal degradation characteristics of a new macromonomer poly(epsilon-caprolactone) with central 4,4'-dicarbaldehyde terphenyl moieties and poly(phenylene vinylene)s with well defined (E-caprolactone), (PPV/PCL) as lateral substituents were investigated via direct pyrolysis mass spectrometry. The unexpectedly high thermal stability of the macromonomer was attributed to intermolecular acetylation of benzaldehyde yielding a hemiacetal and causing a crosslinked structure during the pyrolysis. Increased th...
Thermal degradation of poly(isobornyl acrylate) and its copolymer with poly(methyl methacrylate) via pyrolysis mass spectrometry
Ozlem, Suriye; Aslan-Guerel, Evren; Rossi, Rene M.; Hacaloğlu, Jale (2013-03-01)
In this work, the thermal degradation characteristics of poly(isobornyl acrylate) (PIBA), and its copolymer with PMMA, P(MMA-co-IBA) were investigated via direct pyrolysis mass spectrometry. Thermal degradation behavior of poly(isobornyl methacrylate) (PIBMA) was also studied for a better understanding of thermal degradation mechanism of PIBA. For both PIBA and PIBMA, gamma-H transfer from the isobornyl ring to the carbonyl group was predominantly effective in thermal degradation. As a consequence of evolut...
Thermal degradation characteristics of polysulfones with benzoxazine end groups
Orhan, Tugba; Ates, Sahin; Hacaloğlu, Jale; Yagci, Yusuf (2012-01-01)
Thermal degradation behaviors of phenol and benzoxazine end-capped polysulfone macromonomers (PSU-OH and PSU-P-a) and pre-cured PSU-P-a in the absence and presence of aniline and phenol based benzoxazine monomer (P-a) were investigated via pyrolysis mass spectrometry. A significant increase in thermal stability of both polysulfone and polybenzoxazine chains upon polymerization of benzoxazine end groups was determined compared to phenol-ended polysulfones and aniline based monofunctional polybenzoxazine. The...
Thermal degradation of poly(propylene oxide) and polyepichlorohydrin by direct pyrolysis mass spectrometry
Uyar, T; Hacaloğlu, Jale (2002-09-01)
The thermal degradation of poly(propylene oxide), (PPO) and polyepichlorohydrin, (PECH) were studied with the use of direct pyrolysis mass spectrometry. The effects of heating rate and dissociative ionization on fragmentation pattern have also been investigated. It has been determined that PPO degrades via a random cleavage mechanism, the labile C-O bond scissions being preferred, An analogous degradation mechanism can be proposed for PECH. Yet, the elimination of side chains, evolution of HCl and the loss ...
Citation Formats
S. Ozlem-Gundogdu, E. A. Gurel, and J. Hacaloğlu, “Pyrolysis of of poly(methy methacrylate) copolymers,” JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS, pp. 529–538, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30196.