Effect of talc on thermal stability and flame retardancy of polycarbonate/PSBPBP composite

Abstract

A novel flame retardant poly(3-aminopropyl methylsiloxane bis(3-hydroxy phenyl spirocyclic pentaerythritol bisphosphate)) (PSBPBP) in combination with talc was blended into polycarbonate (PC) by melt compounding. The flame retardancy and thermal stability of PC/PSBPBP/talc composites were investigated by limiting oxygen index (LOI) test, UL-94 rating test, thermogravimetric analysis (TGA), Raman spectroscopy (RS), and scanning electron microscope (SEM). The mechanical properties were also measured in this work. Increasing talc content leads to observed improvement on flame retardancy of PC composites. LOI value of PC/PSBPBP/10 wt % talc system was 34, and this system passed V0 rating in the UL-94 test. The char yield at 700 C was 28.2% and the onset decomposition temperature shifted up to 540 C for PC/10% PSBPBP/10% talc system in TGA. In the Raman measure, the R value and G linewidth of PC/PSBPBP with 10 wt % talc composite increased to 1.41 and 65 cm À1 from 1.12 and 43 cm À1 of pure PC, respectively. The Raman results suggest that the char residue of PC/PSBPBP with talc composites was denser and had better barrier property, which is agreement with the SEM results. Besides, talc had no remarkable influence on the mechanical properties of PC/PSBPBP composites.

Structural design of flame‐retardant phosphatized unsaturated polyester resin

“…The pyrolytic PO 4 Á can capture active free radicals (H˙and OH˙) in the flame zone, thus terminating further burning. 39,40 In contrast, the relative peak intensity of benzylidene (m/z = 91) are more obvious in mass spectrum of UPR-0, while UPR-1 and UPR-2 have the relatively high peak intensities of benzene (m/z = 77) and phthalic anhydride (m/z = 148). This declares the flameretardant phosphatized unsaturated polyester resins have the different pyrolysis processe compared to UPR-0.…”

Flame‐retardant poly (ethylene terephthalate) enabled by a novel melamine polyphosphate nanowire

“…The intensity ratio of D to G was relevant to the microcrystal size of the char layer. Higher I D /I G value means a smaller carbonaceous structure of char residue, indirectly committing to better flame retardance 34. In detail, the I D /I G value for pure PET was 1.21, whereas the PET/FR5.0 nanocomposite displayed a higher I D / I G value (2.43), almost two times as much.…”

Effect of ammonium polyphosphate and fillers on flame retardant and mechanical properties of recycled PET injection molded

“…It implied a reduction of degradation rate in glass bead‐filled RPET composites. The potential of fillers for improving thermal stability was reported in the composites of filler and flame retardant‐filled polycarbonate and polyamide …”

“…The potential of fillers for improving thermal stability was reported in the composites of filler and flame retardant-filled polycarbonate and polyamide. [19,20] Thermal degradation temperature was determined from temperature at 5% of weight loss (T d5 ) and 50% of weight loss (T d50 ). Degradation temperature (T d5 ) of RPET was unchanged when filled with glass bead and talc as tabulated in Table 2.…”