One-Pot Synthesis of Cyclomatrix-Type Polyphosphazene Microspheres and Their High Thermal Stability.

Content Provider	Europe PMC
Author	Rhili, Khaled Chergui, Siham Samih ElDouhaibi, Ahmad Mazzah, Ahmed Siaj, Mohamed
Copyright Year	2023
Abstract	Highly cross-linkedinorganic and organic hybrid cyclomatrix-polyphosphazenesmicrospheres (C-PPZs) have been successfully synthesized by a one-potpolymerization technique between hexachlorocyclotriphosphazene and p-phenylenediamine in the presence of triethylamine (TEA),and they were used for enhancing the flame retardancy of epoxy resins(EPs). A thermoset EP was prepared by incorporating different percentages(2, 5, and 10%) of C-PPZs into diglycidyl ether of bisphenol A (DGEBA).The results reveal that the size and morphology of the microspherescan be tuned by varying the synthesis temperature. The average sizeof C-CPPZs gradually increased from 3.1, 4.9, to 7.8 μm as thetemperature was increased from 100, 120, to 200 °C, respectively.The thermogravimetric analysis showed that the C-CPPZ microsphereshave good thermal stability up to 900 °C with about ∼10wt % mass loss for C-CPPZs formed at 200 °C compared to ∼30wt % mass loss for those obtained at 100 and 120 °C. The 10%loss at 900 °C is much lower than the previous research concerningthe thermal stability of cyclophosphazene, in which more weight losseswere observed at lower temperatures. The resulting C-CPPZ microsphereswere characterized by spectroscopic and imaging techniques includingFourier transform infrared spectroscopy, Raman spectroscopy, X-raydiffraction, scanning electron microscopy, energy-dispersive X-rayspectroscopy, elemental mapping, and X-ray photoelectron spectroscopy.
Journal	ACS Omega
Volume Number	8
PubMed Central reference number	PMC10018513
Issue Number	10
PubMed reference number	36936297
e-ISSN	24701343
DOI	10.1021/acsomega.2c06394
Language	English
Publisher	American Chemical Society
Publisher Date	2023-02-27
Access Restriction	Open
Rights License	Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). © 2023 The Authors. Published by American Chemical Society
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering