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Intercalation of phosphotungstic acid into layered double hydroxides by reconstruction method and its application in intumescent flame retardant poly (lactic acid) composites
- Source :
- Polymer Degradation and Stability. 147:142-150
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Phosphotungstic acid is a typical kind of superior catalysts, and it is hardly to intercalate into the layered double hydroxides (LDH) by ion-exchange process because of its low negative charge. In this work, a phosphotungstic acid intercalated MgAl-LDH (PWA-LDH) was prepared by reconstruction method, and it was then introduced into poly (lactic acid) (PLA) resin in association with intumescent flame retardant (IFR) by melt blending to prepare a flame-retardant biodegradable PLA composite. The effects of PWA-LDH on the flame retardancy of PLA composites were characterized by limiting oxygen index (LOI), vertical burning test (UL-94) and cone calorimeter test. The results showed that the composite sample containing 18.0 wt% IFR and 2.0 wt% PWA-LDH achieved the maximal LOI value of 48.3%, passed the UL-94 V-0 rating, and significantly decreased the peak heat release rate from 306.3 kW/m2 of neat PLA to 40.1 kW/m2. Thermogravimetric analysis showed that both the thermal stability and the char formation were enhanced. The char morphology observation revealed that PWA-LDH was beneficial to form dense and compact char layers. It was demonstrated that there existed a synergistic effect between IFR and PWA-LDH in promoting the char formation and enhancing the fire resistance.
- Subjects :
- Thermogravimetric analysis
Materials science
Polymers and Plastics
Layered double hydroxides
02 engineering and technology
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
Limiting oxygen index
chemistry.chemical_compound
chemistry
Mechanics of Materials
Cone calorimeter
Materials Chemistry
engineering
Phosphotungstic acid
Char
Composite material
0210 nano-technology
Intumescent
Fire retardant
Subjects
Details
- ISSN :
- 01413910
- Volume :
- 147
- Database :
- OpenAIRE
- Journal :
- Polymer Degradation and Stability
- Accession number :
- edsair.doi...........9ec749774d9e4a12a3e60f0b327e7e4b