Synthesis
and Properties of a Photopolymerizable Carbene-Mediated
Poly Phosphinate Flame Retardant by Carbene Polymerization
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Abstract
A novel photopolymerizable poly phosphinate
(poly ethyl (4-acrylamidebenzyl)phosphinate,
P-NH-AC) flame retardant was synthesized by a carbene polymerization
and characterized using Fourier transform infrared spectroscopy (FTIR),
nuclear magnetic resonance spectroscopy (NMR), and gel permeation
chromatography (GPC). The effect of P-NH-AC on the kinetics of photopolymerization,
thermal stability, combustion behaviors, and physical and mechanical
properties of the UV-cured materials were investigated by real-time
infrared spectroscopy (RT-IR), thermogravimetric analysis (TGA), thermogravimetric
analysis/infrared spectrometry (TGA-IR), the limiting oxygen index
(LOI), and the cone calorimetric test (CCT). For the systems with
P-NH-AC, the thermal stability was improved with the increase of the
P-NH-AC; however, the final residue of all systems was low. The addition
of 5% P-NH-AC increased the LOI from 29.0 to 32.0. The addition of
P-NH-AC significantly decreased the heat release rate (HRR), total
heat release (THR), and total smoke production (TSP) of the resin.
Moreover, P-NH-AC can also improve physical and mechanical properties
of the materials