Flame‐retardancy and anti‐dripping effects of intumescent flame retardant incorporating montmorillonite on poly(lactic acid)

Abstract

In the present study, the effects of intumescent flame retardant (IFR) incorporating organically modified montmorillonite (O‐MMT) on the flame retardancy and melt stability of PLA were investigated. The flame‐retardant PLA was prepared using a twin‐screw extruder and a two roll mill. Then, the influence of IFR and MMT on flame retardancy and melt stability was thoroughly investigated by means of limiting oxygen index (LOI), vertical burning test, thermogravimetric analysis, scanning electronic microscopy, melt flow index (MFI), and parallel plate rheological experiments. The experimental results show that the IFR system in combination with MMT has excellent fire retardancy, i.e. the sample could achieve a UL94 V‐0 rating and LOI value increases from 20.1 for pristine PLA to 27.5 for the flame‐retarded PLA. MFI and rheological measurement indicate that O‐MMT significantly enhances the melt stability and suppresses the melt dripping. Copyright © 2009 John Wiley & Sons, Ltd.

Flame retarded self-reinforced poly(lactic acid) composites of outstanding impact resistance

“…As for a solution, Li et al reported the effective anti-dripping effect of montmorillonite (MMT) clays on PLA matrix when combined with IFR system [23].…”

Flame retarded poly(lactic acid): A review

“…On the contrary, C30B acted as an effective synergist in the intumescent coating enhancing the efficiency of APP/MA [34]. Li et al [93] improved the flame resistant properties and melt stability of PLA using IFR (based on ammonium polyphosphate, melamine and pentaerythritol) Chow et al -eXPRESS Polymer Letters Vol.12, No.5 (2018) and OMMT. It was demonstrated that PLA containing 15 wt% IFR and 5 wt% OMMT successfully fulfilled the V-0 ranking in the UL 94 test and had an LOI value of 27.5%.…”

Degradation and Stability of Poly(lactic Acid)

“…These polymers are very unfavorable on burning: they intensify burning due to serious melt dripping. Li et al (2009) used MMT modified with N,N-dimethyl dehydrogenated tallow quaternary ammonium chloride and APP flame retardant system to blend with PLA (see Table 7.18). This successfully overcame the dripping of PLA.…”