Flame retardancy and thermal properties of carboxyl‐containing polysiloxane derivatives in polycarbonate

Abstract

Carboxyl‐containing polysiloxane (LCCP) has been successfully applied in the flame retardancy of polycarbonate (PC). The LCCP was synthesized by hydrosilylation and condensation reaction. The presence of carboxyl groups has been demonstrated to be crucial to provide high flame retardant effectiveness. The flame retardancy of LCCP–PC composites is investigated by limiting oxygen index (LOI), vertical burning tests (UL‐94). At the mole ratio of diethoxymethyl (1‐propionyloxy) silane/diethoxydimethylsilane = 8/100 in LCCP(3), the best flame retardant performance of LCCP‐PC composites was obtained. The LOI value of the composites is 38.5 and the UL‐94 rating reaches V‐0 when the content of LCCP(3) is as low as 0.5 wt %. Evolution of the thermal behaviors of the composites tested by thermogravimetric analysis shows that addition of LCCP(3) in PC can reduce the degradation speed of PC and induce a reduction of the initiated decomposition temperature of PC. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2014, 131, 39814.

Flame‐retardant behavior of a phosphorus/silicon compound on polycarbonate

“…However, PC flame retardancy is often required in many fields, especially in electronic applications. Although some organic halogen compounds can provide better solutions for flame‐retarding PC, worries about the environmental problems of organic halogen compounds drive researchers to pay increasing attention to the more efficient halogen‐free flame retardants …”

Design and Application of Highly Efficient Flame Retardants for Polycarbonate Combining the Advantages of Cyclotriphosphazene and Silicone Oil

“…Another reason is that the silica derivatives react with the PC chain to produce a cross-linked structure, which also promotes the formation of a compact carbon layer. In addition, phosphorus, nitrogen and benzene ring structures can also promote the formation of a regular carbon layer [16,25,26,27,28,29,30,39,40]. The inner surface, shown in Figure 6d, has more holes and microspheres.…”

“…On the other hand, silicon-containing compounds have been considered as a kind of high-efficient flame retardants [27,28]. For example, Song synthesized carboxyl-containing polysiloxane [29] and incorporated it into PC to improve the flame-retardant abilities. The LOI value of the composites was 38.5% and the sample passed UL-94 V-0 testing even when the content of flame-retardant was as low as 1.0 wt%.…”

Porous structure and adsorptive properties of hide waste activated carbons prepared via potassium silicate activation

“…The carbon produced by KOH or NaOH generally has microporous structure, whereas KOH or NaOH can corrode apparatus whose life would be shortened and thus limit the development and application of this activating agent. Actually, silicone material is widely used as flame retardants in the field of extinguishing as a result of hindering the combustion of materials from originating [5].…”