Thermal Degradation Mechanisms in Condensation Polymers

Montaudo, Giorgio; Puglisi, Concetto

doi:10.1007/978-94-009-3425-2_2

Cited by 46 publications

(28 citation statements)

References 155 publications

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“…The curves of total ion We have ascertained above that, in the presence current (TIC) obtained by DPMS closely resemble of an appropriate catalyst, the PC/PMMA system the DTG curves obtained by TG. 26 undergoes an exchange reaction at 230ЊC in the The TGA curves of unmixed PC and PMMA molten state, producing a polycarbonate with together with those of some equimolar blends obmethacrylate and methyl carbonate chain ends tained by solvent casting and mechanical mixing (Scheme 2). Above 300ЊC, the exchange reaction are reported in Figure 5a,b.…”

Section: Resultsmentioning

confidence: 99%

Chemical reactions occurring in the thermal treatment of PC/PMMA blends

Montaudo

Puglisi²,

Samperi³

1998

J. Polym. Sci. A Polym. Chem.

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Section: Resultsmentioning

confidence: 99%

Chemical reactions occurring in the thermal treatment of PC/PMMA blends

Montaudo

Puglisi²,

Samperi³

1998

J. Polym. Sci. A Polym. Chem.

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“…The application of four ramping temperature of 3°C min À1 in a temperature range to 210°C could induce the scission of certain chemical functional groups, such as the covalent band C-O-C, which are known to be the weak point of ester functions. Montaudo and Puglisi [26] located the initial degradation temperatures of polyesters between 230°C and 300°C under inert atmosphere.…”

Section: Post-cross-linking Effects On Mechanical Propertiesmentioning

confidence: 99%

Mechanical, dielectric, and physicochemical properties of impregnating resin based on unsaturated polyesterimides

Fetouhi

Petitgas²,

Dantras

et al. 2017

Eur. Phys. J. Appl. Phys.

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Abstract. This work aims to characterize the dielectric and the mechanical properties of a resin based on an unsaturated polyesterimide diluted in methacrylate reactive diluents used in the impregnation of rotating machines. The broadband dielectric spectrometry and the dynamic mechanical analysis were used to quantify the changes in dielectric and mechanical properties of the network PEI resin, as a function of temperature and frequency. The network characterizations highlight the presence of two main relaxations, a and a 0 , confirmed by the differential scanning calorimetry analysis, showing the complexity of the chemical composition of this resin. The dielectric spectroscopy shows a significant increase in the dielectric values due to an increase of the material conductivity, while the mechanical spectroscopy shows an important decrease of the polymer rigidity and viscosity expressed by an important decrease in the storage modulus. The PEI resin shows a high reactivity when it is submitted in successive heating ramps, which involves in a post-cross-linking reaction.

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“…The detailed degradation mechanism of PEEK is not yet clear owing to the complexity of the pyrogram, although comprehensive reviews of the thermal degradation mechanism were reported previously. 17,18 In the present work, thermal degradation behaviour of PEEK was investigated using a multi-state (or stepwise) Py/GC/MS method by consecutively heating the sample at fixed temperature intervals to achieve narrow temperature (~100 °C) pyrolysis conditions. This method is effective for analyzing PEEK because it can discriminate between the pyrolysates resulting from different pyrolysis temperatures.…”

mentioning

confidence: 99%

A study of thermal degradation of poly(aryl-ether-ether-ketone) using stepwise pyrolysis/gas chromatography/mass spectrometry

Tsai

Perng

Ling

1997

Rapid Commun. Mass Spectrom.

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Thermal degradation of poly(aryl-ether-ether-ketone) (PEEK) was investigated using stepwise pyrolysis/gas chromatography/mass spectrometry (Py/GC/MS) by consecutively heating the sample at fixed temperature intervals to achieve narrow temperature pyrolysis conditions. The individual mass chromatograms of the various pyrolysis products were correlated with the pyrolysis temperature in order to elucidate the pyrolysis mechanism. 4-Phenoxyphenol and 1,4-diphenoxybenzene were detected at 450°C, indicating that the degradation of PEEK was initiated by selective cleavage at chain ends and chain branches. Phenol was detected as the major pyrolysis product by further pyrolysis to 650 °C, which was attributed to the random main chain cleavage of ether groups. At temperatures above 650 °C, chain cleavage at carbonyl ends became the dominant pyrolysis pathway. The high char yield suggested that random main chain scission was accompanied by carbonization. Carbonization was presumably the dominant pyrolysis mechanism at temperatures above 750°C. Results obtained with the new method indicate the interesting potentials of the technique for the investigation of polymeric materials. © 1997 John Wiley & Sons, Ltd. Received 15 August 1997; Revised 17 October 1997; Accepted 20 October 1997 Rapid Commun. Mass Spectrom. 11, 1987-1995(1997 Pyrolysis uses heat alone to break down large molecules into molecules of lower mass due to thermal fission and, occasionally, of higher mass due to intermolecular reaction. The nature of the fragmentation and recombination products is determined largely by the heating parameters and ambient conditions. The analysis of pyrolysis products (pyrolysates) thus provides an alternative means to study polymeric and complex materials that are not suitable for direct analysis by popular techniques such as chromatography and mass spectrometry. From an analytical viewpoint, the applications of analytical pyrolysis are limited by the complexity of the pyrolysates. As a result, the integration of pyrolysis with Fourier transform infrared spectroscopy (Py/FTIR), mass spectrometry (Py/MS), and gas chromatography (Py/GC) is necessary for the routine analysis of polymeric and complex materials. Py/MS offers the advantages of the speed of analysis, the ease of automated data processing, and the richness in chemical information. Py/GC is capable of separating isomers and is a useful tool for quantitative analysis. The integration of pyrolysis with GC/MS (Py/GC/MS) could therefore provide additional sensitivity and selectivity, and extend the application fields of pyrolysis.

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Thermal Degradation Mechanisms in Condensation Polymers

Cited by 46 publications

References 155 publications

Chemical reactions occurring in the thermal treatment of PC/PMMA blends

Chemical reactions occurring in the thermal treatment of PC/PMMA blends

Mechanical, dielectric, and physicochemical properties of impregnating resin based on unsaturated polyesterimides

A study of thermal degradation of poly(aryl-ether-ether-ketone) using stepwise pyrolysis/gas chromatography/mass spectrometry

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