Tirri, Teija published the artcileSulfenamides in synergistic combination with halogen free flame retardants in polypropylene, Quality Control of 52829-07-9, the main research area is sulfenamide halogen free flame retardant polypropylene thermal fireproofing.
Sulfenamide based radical generators that contain a nitrogen-sulfur (N-S) core, can alone provide flame retardancy in polypropylene (PP), polyethylene and polystyrene, as we have earlier demonstrated. Herein, sulfenamides potential as synergists with conventional halogen free flame retardants has been explored. Thus, five different sulfenamides were individually combined with selected eco-friendly, phosphorus based flame retardants or aluminum trihydroxide (ATH), and their effect on polypropylene flammability was assessed by limiting oxygen index (LOI), vertical flammability (UL 94 V) and cone calorimeter tests. Thermogravimetric anal. (TGA) and NMR (NMR) studies were carried out to detect changes in thermal behavior when such two component FR systems were mixed together at different ratios. TGA-FTIR (thermogravimetric anal.-Fourier transform IR spectroscopy) was used to investigate the differences in decomposition products of non-flame retarded vs. flame retarded PP. Strong synergistic effects were observed, and the UL 94 V-0 rating was reached for PP with a total FR loading of 10 wt% using 8 wt% of phosphonate ester AFLAMMITPCO 900 together with 2 wt% of sulfenamide flame retardant. In a ternary mixture of an addnl. phosphazene additive (SPB-100), the needed total concentration for V-0 rating was further reduced to 9 wt%. In addition, the combination of 4 wt% of aluminum hypophosphite (AHP) with 0.5 wt% of sulfenamide offered a unique halogen free solution for achieving UL 94 V-2 rating in PP. Cone calorimeter studies of an ammonium polyphosphate-pentaerythritol based intumescent system in combination with 0.5 wt% of sulfenamide also showed encouraging results. The char stability was enhanced, the peak of heat release rate (HRR), CO and CO2 production and total smoke generation were all reduced compared to the reference sample without sulfenamide.
Polymer Degradation and Stability published new progress about Chars. 52829-07-9 belongs to class piperidines, name is Bis(2,2,6,6-tetramethylpiperidin-4-yl) decanedioate, and the molecular formula is C28H52N2O4, Quality Control of 52829-07-9.
Referemce:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem