Polish version

Login form

register


Print

A. Shaban, S. M. Al-Shukri, H. I. Kahlaf, O. A. Al Hanbali

Synthesis, characterization, thermal and fire retardant properties of new homo- and block copolymers of polyacrylate and epoxy resin with cyclotriphosphazene core (in English)

Polimery 2019, No 9, 577


DOI: dx.doi.org/10.14314/polimery.2019.9.2

Summary

New homo- and block copolymers composed of polyacrylate and epoxy resin with hexafunctional cyclotriphosphazene core were synthesized and characterized by FT-IR and 1H-, 13C-, and 31P- NMR. The first homopolymer, PN-polyacry was prepared from the direct condensation of 2-hydroxyethyl­acrylate with acyl chloride of hexakis(4-carboxyphenoxy)cyclotriphosphazene, PN-acyl. The second homopolymer, PN-Ep, was prepared in a direct reaction of catalyzed carboxyl groups of hexakis(4-carboxyphenoxy)cyclotriphosphazene PN-COOH with epoxy resin via an oxirane ring opening re­action. The block copolymer, PN-Ep/polyacry, was prepared from the partial coupling of 2-hydroxyethyl acrylate with the PN-acyl, followed by the reaction of unreacted carboxyl groups with epoxy resin. Differential scanning calorimetry (DSC) analysis of the PN-Ep/polyacry copolymer exhibited good compatibility between polyacrylate and cured epoxy resin. Thermal gravimetric analysis (TGA) revealed that the prepared polymeric systems accumulate 30–38 wt % char at elevated temperatures, compared to neat polyacrylate and cured epoxy resin, which accumulate negligible char at 700 °C. The limiting oxygen index (LOI) exhibited significant enhancement of fire retardant properties of the prepared polymeric systems. A scanning electron microscopy (SEM) morphology study revealed that PN-polyacry and ­PN-Ep/polyacrylate produced intumescent char residues while PN-Ep produced solid dense char with a nonporous surface.


Keywords: synthesis, cyclotriphosphazene, epoxy resin, polyacrylate, thermal stability, flame retardant
e-mail: salah_M@uomustansiriyah.edu.iq
A. Shaban, S. M. Al-Shukri, H. I. Kahlaf, O. A. Al Hanbali
Synthesis,characterization, thermal and fire retardant properties of new homo- and blockcopolymers of polyacrylate and epoxy resin with cyclotriphosphazene core (in English)