Thermal stability of fractionated samples of some oligoarylenes

Берлин, А. А.; Grigorovskaya, V.A.; Sel'skaya, O.G.

doi:10.1016/0032-3950(70)90433-8

Cited by 4 publications

(2 citation statements)

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“…Their TG data demonstrate a continous increase in the thermal stability measured in vacuo, while an extremum was observed in air ( Fig. 1) [6,8] with increasing mean molecular weight. A decrease of thermal stability in air after attaining a certain molecular weight has also been observed for some other oligoarylene fractions [8].…”

Section: Resultsmentioning

confidence: 87%

“…1) [6,8] with increasing mean molecular weight. A decrease of thermal stability in air after attaining a certain molecular weight has also been observed for some other oligoarylene fractions [8]. The observed effects of M n on thermal and thermooxidative stabilities have been confirmed for oligomers of various molecular weights prepared by a special change of synthetic conditions [9].…”

Section: Resultsmentioning

confidence: 96%

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Thermal transformations of oligoarylenes

Grigorovskaya

Sel'skaya

Khakimova

et al. 1975

Journal of Thermal Analysis

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Thermal transformations of oligoarylenes, relating to polymers with conjugate systems, have been investigated in air and in vacuo, depending on the molecular weight and degree of branching of the original material. The extreme character of the thermostability in air versus the M-n value of oligoarylene, and the possibility of increasing the thermal oxidative stability by enhancing the degree of branching have been explained by different intensities of intermolecular processes of dehydropolycondensation in the period before the starting of substantial weight losses. The influence of the solidification (or carbonization) conditions of the oligoarylenes on the structures and thermooxidative stabilities of the resulting samples was studied.Oligoarylenes deserve attention with a view to creating polymer systems which display high thermal stability [1 ]. In the present work thermal transformations of oligoarylenes (based on condensed aromatic compounds) were investigated in air and in vacuo, at 20-800 ~ depending on Mn and the degree of branching in the starting material. The effects of the solidification (or carbonization) conditions (heating rate and final temperature) on the thermooxidative stability and structure of the resulting products were also__investigated. These investigations were carried out for oligoarylenes of various M, values and degrees of branching.

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Section: Resultsmentioning

confidence: 87%