Structural and Dynamic Properties of Flame-Retardant Phosphorylated-Polycarbonate/Polycarbonate Blends
Wissawat Sakulsaknimitr, Chompunut Wongsamut, Pornpen Atorngitjawat
TL;DR
Adding a small amount of phosphorylated polycarbonate improves flame resistance and thermal stability of polycarbonate blends.
Contribution
The study demonstrates eco-friendly flame retardancy in polycarbonate blends using phosphorylated polycarbonate.
Findings
Blends with phosphorylated polycarbonate showed improved thermo-oxidative stability and UL-94 ratings.
Dielectric relaxation analysis revealed new local relaxation modes from phosphorylated branches.
Physical crosslinks formed by nanoclusters of phosphorylated polar groups were identified.
Abstract
The eco-friendly flame retardancy of polycarbonate (PC) was achieved by blending with phosphorylated-PC in the range of 1–5% w/w. Dynamic properties were characterized using broadband dielectric relaxation spectroscopy (DRS), while structural and thermal properties were investigated using Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, small-angle X-ray scattering, differential scanning calorimetry, and thermogravimetric analysis. A reduction in the single glass transition temperature with increasing phosphorylated-PC content was observed, indicating that the blends were miscible. No crystalline phases were detected in any of the samples. The thermo-oxidative stability and UL-94 ratings of flame-retardant polycarbonates (FRPCs) improved compared to neat PC, with char residue increasing as the phosphorylated-PC content rose. DRS analysis revealed the formation of a…
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Taxonomy
TopicsFlame retardant materials and properties · Polymer Foaming and Composites · biodegradable polymer synthesis and properties