The ring 1 ita1/23/2023 By comprehensive analysis, the suitable dosage of DIMEC/P was no more than 15%. The cell size of CPFs was less and the cell distribution was relatively regular. Compared with PF, the mechanical properties, flame retardancy, and the residual carbon (800 ☌) of CPFs were increased. The reaction orders were all non-integers. ![]() With the dosage of DIMEC/P increased, the E a values of DIMEC composite phenolic resins were increased gradually. ![]() The residual carbon (600 ☌) was increased by 25.7%. Additionally, thermal stability was decreased and T i decreased by 24 ☌. Compared with EC, the crystallinity of DIMEC was dramatically decreased, and the diffraction peak positions were basically unchanged. The molecular structure and microstructure were characterized by FT-IR spectra and SEM, respectively. The structures of DOPO-ITA were verified by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance ( 1H NMR). ![]() In order to improve the performance of phenolic foam, an additive compound of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and Itaconic acid (ITA) were attached on the backbone of ethyl cellulose (EC) and obtained DOPO-ITA modified EC (DIMEC), which was used to modify phenolic resin and composite phenolic foams (CPFs).
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