Can I read Thermal Degradation of Para-substituted Polystyrenes on EtoBox?

Thermal Degradation of Para-substituted Polystyrenes by Vjacheslav V Zuev; Fabio Bertini; Guido Audisio is a Materials Science article available to read on EtoBox.

What is Thermal Degradation of Para-substituted Polystyrenes about?

The thermal degradation of a series of para-substituted polystyrenes with electron-donating (CH 3 , NH 2 ) and electron-attracting (NO 2, Cl,Br) substituents has been studied in isothermal conditions at 600 C using pyrolysis chromatography/mass spectrometry and in dynamic conditions using thermogravimetry. The pyrolysis of these substituted polystyrenes gives monomer as the main product for all polymers (60±80 wt.%). The other distribution of products supports the view that thermodestruction of these polymers starts from a random chain scission. The main process for all substituted polystyrenes is depolymerization, similar to unsubstituted polystyrene. In the case of para-substituted polystyrenes a good linear dependence was found between T max on the thermogravimetry curve and the Hammett constants of the substituents (T max =403.5±67.486 ' x ). The results indicate that the Hammett relationship can describe quantitatively the trends in T max and thus thermostability of substituted polystyrenes and that thermostability of these polymers depends only on electronic nature of substituent and their possibility to stabilise macroradicals forming on chain scission.

Who reads Thermal Degradation of Para-substituted Polystyrenes?

Author

Vjacheslav V Zuev; Fabio Bertini; Guido Audisio

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0141-3910)

Published

2001

Language

EN

Field

Materials Science (Physical Sciences)