Synthesis and Characterization of a Novel Flame Retardant and its Application in Polycarbonate

Abstract

pingwei@sjtu.edu.cn ABSTRACT: A novel solid flame retardant poly(3-aminopropyl methylsiloxane bis(3-hydroxyphenyl spirocyclic pentaerythritol bisphosphate)) (PSBPBP) consisted of phosphorus, silicon, and nitrogen was synthesized and characterized by NMR and FTIR. Then PSBPBP was added to a polycarbonate matrix. The flame retardancy and mechanical properties of the PC/PSBPBP system were tested for limiting oxygen index (LOI), UL-94 rating, tensile, and impact strengths. A significant improvement of flame retardancy of the system was observed (increase of LOI up to 31, and UL-94 V0) with an addition of 15 wt% PSBPBP to PC. Raman spectrum and SEM images have proved the formation of dense and intumescent char in the combustion, which acted as an insulator to the transfer of heat and combustible gases.

Synthesis and properties of a new halogen-free flame-retardant epoxy resin curing agent

“…There are several absorption peaks for SPDPC: 1027 cm À1 (P-O-C), 854 cm À1 (P-O), 1307 cm À1 (P¼O), and 549 cm À1 (P-Cl), in agreement with the previous report. 17 In the FTIR spectra of PMXSPB, absorption peaks are observed at 3365, 3275, 1615 cm À1 (-NH 2 ), 3029 cm À1 (C-H), 1513 cm À1 (C¼C), 1238 cm À1 (P¼O), 1021 cm À1 (P-O-C), and 1079 cm À1 (P-N). The disappearance of the peak at 549 cm À1 (P-Cl) indicates the completion of the chemical reaction in Figure 1.…”

“…The DTG results indicate that PMXSPB undergoes a major weight loss of 12.5% at 320 C, which is attributed to the fracture of the phosphate ester bonds. 17 The greater decomposition temperature of PMXSPB can satisfy the processing requirements of commonly used polymers.…”