Performance improvement of flame-retarded poly(butylene terephthalate)/aluminum diethylphosphinate composites by epoxy-functional polysiloxane

Abstract

An epoxy-functional polysiloxane (EPM) was employed for improving the performance of flame-retarded poly(butylene terephthalate)/aluminum diethylphosphinate (PBT/AlPi) composites. The effect was investigated by UL-94 test, limiting oxygen index, mechanical test, torque rheometer measurement, differential scanning calorimetry, dynamic mechanical analysis, and heat distortion temperature. An obvious increase in torque evolution of the PBT/AlPi composite during processing was associated with chain-extending, branching, and cross-linking reaction by the combination of EPM. The addition of 0.6 wt% EPM remarkably enhanced not only the mechanical properties but also the flame retardancy and heat resistance of the PBT/AlPi composite. A high-performance PBT/AlPi composite was developed by virtue of EPM.

Application of bis(glycidyloxy)phenylphosphine oxide as a chain extender for polyamide-6

“…In addition, as previously mentioned, a plasticizing effect occurred when the quantity of BGPPO exceeded the saturation point, implying some fraction of the BGPPO was unable to react with the PA6, giving a reduction in mechanical strength. 26,27 A similar tendency appeared in the dependence of impact strength on BGPPO content (Fig. 8), indeed it showed a larger degree of improvement.…”

The effect of aluminum phosphinate on char formation of phosphorus-containing deoxybenzoin polymer

“…This might be ascribed to the formation of AlPO 4 from AlPi. 3,22 The morphology of yielded carbon material from BHDB-PPN, BHDB-PPN/AlPi (99/1), and BHDB-PPN/AlPi (98/2) was shown in Figure 11. Porous structure with micrometer size was observed in the char formed from BHDB-PPN, but the size of porous structure decreased significantly because of the introduction of AlPi to BHDB-PPN.…”

“…Phosphorous-containing compounds were extensively discussed and used as promising halogen-free flame retardants in the past few years. 1 –3 Phosphorus-containing flame retardants could act either through flame inhibition in the gas phase and/or through char forming in the condensed phase to improve the flame retardant property of polymer. 4 –6 For example, bisphenol-A bis(diphenyl phosphate) (BDP) and resorcinol bis(diphenyl phosphate) (RDP) were two phosphate flame retardants used in the polycarbonate (PC) material.…”

Phosphorus/Bromine Synergism Improved the Flame Retardancy of Polyethylene Terephthalate Foams

“…[ 20 ], and the flame retardants containing these elements play a flame-retardant role mainly in the gas phase or condensed phase. Common halogen-free flame retardants include red phosphorus [ 21 ], phosphonitrile [ 22 , 23 ], phosphonate [ 24 , 25 ], polyphosphoric acid [ 26 ], zinc borate [ 27 ], magnesium hydroxide [ 28 ], aluminum hydroxide [ 29 ], antimony trioxide [ 30 ], etc.…”