Flame‐retardant polycarbonate/acrylonitrile‐butadiene‐styrene based on red phosphorus encapsulated by polysiloxane: Flame retardance, thermal stability, and water resistance

Abstract

Red phosphorus encapsulated by polysiloxane (MRP) was prepared, and the chemical structure and morphology of MRP were characterized by FTIR and TEM, respectively. A series of flame retardant polycarbonate/acrylonitrile-butadiene-styrene containing MRP (PC/ ABS/MRP) were prepared via melt-blending. The flame retardance of PC/ABS/MRP was investigated by limiting oxygen index (LOI) and UL-94 test. It was shown that the LOI value was increased to 27.7 and UL-94 achieved a V-0 rating at a 15 wt % loading of MRP. Cone calorimetric results showed that the peak of heat release rate (PHRR) of PC/ABS/15% MRP decreased from 452.7 to 198.0 kW/m 2 , and the total heat release decreased from 92.9 to 60.7 MJ/m 2 compared with virgin PC/ABS. Thermal stability analysis showed that the char yield of the PC/ABS/15% MRP increased from 0 to 16.1 wt % under air atmosphere, and from 15.2 to 27.4 wt % under nitrogen atmosphere compared to virgin PC/ABS, respectively. The sample PC/ABS/15% MRP also showed excellent water resistance of flame retardance in 70 C water for 168 h.

Aluminum Hypophosphite versus Alkyl-Substituted Phosphinate in Polyamide 6: Flame Retardance, Thermal Degradation, and Pyrolysis Behavior

“…In recent years, effective halogen-free flame-retarded systems became one of the most popular topics of relevant materials research due to the environment problems of halogen-containing flame retardants. Phosphorus-based flame retardants like red phosphorus, inorganic, and organic phosphorus-containing compounds were considered more effective to the most polymers, particularly to PA6. − The color problem, flammability, and release of phosphine during processing limit the application of red phosphorus although it was one of the most effective flame retardants in polyamide and other polymers. , In addition, metal phosphinates were proven to be effectively flame retardant active in both condensed and gaseous phases. The recently developed and commercialized aluminum diethylphosphinate (AlPi) was found to be effective in polyamides, polyesters, PMMA, and their glass fiber reinforced composites. − Braun et al found that AlPi acted mainly by flame inhibition when it was in combination with melamine polyphosphate and zinc borate in glass-fiber-reinforced PA66 .…”

“…1−4 The color problem, flammability, and release of phosphine during processing limit the application of red phosphorus although it was one of the most effective flame retardants in polyamide and other polymers. 5,6 In addition, metal phosphinates were proven to be effectively flame retardant active in both condensed and gaseous phases. The recently developed and commercialized aluminum diethylphosphinate (AlPi) was found to be effective in polyamides, polyesters, PMMA, and their glass fiber reinforced composites.…”

Metal‐phenolic networks: A biobased synergist for EVA/APP composites toward enhanced thermal stability and flame retardancy

“…The onset decomposition temperature (T 5% ) of TA and TAC were 220 and 240 C, respectively, endowing them a good match with processing temperatures of EVA. [17][18][19] While the maximum decomposition temperature (T max ) of TAC increased largely, it was 95 C higher than the corresponding value of TA, which was ascribed to the decomposition of phenolic hydroxyl groups ahead of phenolic hydroxyl-Fe 3+ complex. Meanwhile, the obvious decrease of the decomposition rate of TAC at the T max (R Tmax ) led to increase of residual weight, leaving as much as 49.5% residual char (C wt ) after heating to 600 C. Evidently, the charring capability of TAC was nearly two times compared with that of TA, while the char residue of traditional synthetic charring agents 20,21 at 600 C were only 0.5 wt %.…”

Recent Advances in Halogen-Free Flame Retardants for Polyolefin Cable Sheath Materials

“…To solve this issue, RP should be treated before use. An effective method is to encapsulate the RP by using the so-called microencapsulation technology [ 33 , 34 ]. Microcapsule technology is to cover the surface of the FRs with a coating of organic or inorganic materials [ 35 ].…”