Abstract
From a set of around 100 phosphorus-containing polymers tested in pyrolysis–combustion flow calorimetry, the contributions to flammability of two phosphorus-containing pendant groups (called 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and PO3) were calculated using an advanced method previously proposed and validated. The flammability properties include total heat release (THR) and heat release capacity (HRC) measured in standard conditions, i.e., anaerobic pyrolysis and complete combustion. The calculated contributions are in good agreement with the main modes of action of both phosphorus groups, i.e., flame inhibition for DOPO and char promotion for PO3. Moreover, the results provide first conclusions about the cooperative interaction between phosphorus and nitrogen, as well as the influence of the architecture of tested co-polymers.
Highlights
Phosphorus is currently considered as a key element to develop flame-retardant (FR) materials.it can act as a char promoter in the condensed phase and/or as a flame inhibitor in the gaseous phase [1]
Conclusions the contributions calculated previously: 20 kJ/g and 400 J/g·K considering the dioxaphosphorinane as. This attempt to calculate the contributions to flammability of phosphorus groups is the first a whole
Structure fragmentation of dioxaphosphorinane groupgroup into smaller groups
Summary
Phosphorus is currently considered as a key element to develop flame-retardant (FR) materials. It can act as a char promoter in the condensed phase and/or as a flame inhibitor in the gaseous phase [1]. Phosphorus groups can be chemically incorporated into thermoplastic chains or thermoset networks [2,3]. This so-called reactive approach is expected to enhance the durability of materials by preventing the migration of FR outside the polymer matrix [4].
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