Thermal Decomposition of Styrenic Polymers Modified with Covalently Bound P- and N-containing Groups: Analysis of the Gaseous-Phase Mechanism

Svetlana Tretsiakova-McNally, Paul Joseph, Aloshy Baby, Doris Pospiech, Eileen Schierz, Albena Lederer, Malavika Arun

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Abstract

Through the present study, we have modified polystyrene chains by chemically binding nominal amounts
of P- and/or N-containing monomers via a free radical polymerization. The selected monomers included:
diethyl(acryloyloxymethyl)phosphonate (DEAMP), diethyl-p-vinylbenzyl phosphonate (DEpVBP), acrylic
acid-2-[(diethoxyphosphoryl)methylamino]ethyl ester (ADEPMAE) and maleimide (MI). The purpose of
these chemical modifications was to enhance the fire retardance in the resultant co- and ter-polymers
prepared via a solution polymerization technique. Thermogravimetric (TGA) and pyrolysis combustion
flow calorimetry (PCFC) investigations found that the modified systems exhibited an improved propensity
to form char residues and had lower heat release rates, as compared to the control homopolymer.
Furthermore, pyrolysis/GC-MS was employed to identify the major volatile products formed upon the
thermal decomposition of the polymers. For instance, ethanol, benzaldehyde, acetophenone
triethylphosphate, as well as styrene and styrene oligomers were detected in the gaseous phase emanating
from the pyrolysis reaction(s) of the modified polymers, indicating a significantly altered decomposition
mechanism.
Original languageEnglish
Number of pages1
Publication statusPublished - 4 Jun 2022
EventACS Fire and Polymers - Napa Valley, Napa, United States
Duration: 5 Jun 20228 Jun 2022
https://www.polyacs.net/22fipoaccommodations

Conference

ConferenceACS Fire and Polymers
Country/TerritoryUnited States
CityNapa
Period5/06/228/06/22
Internet address

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