Use of Magnesium Hydroxide as Flame Retardant in Poly(Lactic Acid)/High Impact Polystyrene/Wood Flour Composites

This work aimed to use magnesium hydroxide (MH) as a flame retardant in poly(lactic acid) (PLA)/high impact polystyrene (HIPS)/wood flour (WF) composite. The 80/20/20 PLA/HIPS/WF composite was melt mixed with three loadings (20, 30 and 40 phr) of MH on a twin screw extruder, followed by an injection molding. The prepared wood-plastic composites (WPCs) were investigated for their impact strength (IS), tensile strength (TS), Young’s modulus (E), elongation at break (EB), flammability and morphology. The results showed that the 80/20/20 PLA/HIPS/WF composite exhibited higher IS, TS and E than the neat PLA, but at the expense of reducing the EB. It was also found that the WPCs filled with MH at all loadings provided much higher flame resistance and E over the neat PLA, HIPS, PLA/HIPS blend and PLA/HIPS/WF composite. Therefore, the MH could play an effective role as flame retardant in the WPCs.

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Wood, silver-substituted zeolite and triclosan as biodegradation controllers and antibacterial agents for poly(lactic acid) (PLA) and PLA composites

Journal of Thermoplastic Composite Materials ◽

10.1177/0892705715604683 ◽

2015 ◽

Vol 30 (5) ◽

pp. 583-598 ◽

Cited By ~ 5

Author(s):

Chana Prapruddivongs ◽

Narongrit Sombatsompop

Keyword(s):

Lactic Acid ◽

Antimicrobial Agents ◽

Wood Flour ◽

Plate Count ◽

Poly Lactic Acid ◽

Mechanical And Thermal Properties ◽

Scanning Calorimetry ◽

Elongation At Break ◽

Plate Count Agar ◽

Twin Screw

Poly(lactic acid) (PLA) and wood flour/PLA composites were prepared and blended with two antimicrobial agents, triclosan and silver-substituted zeolite (Zeomic), using a twin-screw extruder. The mechanical and thermal properties, antimicrobial activity, and biodegradation performance were investigated. The addition of wood and Zeomic was found to increase the Young’s modulus of the composites, whereas the tensile strength, elongation at break, and impact strength dropped. However, the mechanical properties of PLA and wood/PLA loaded with triclosan did not show any definite trends. Differential scanning calorimetry data indicated that the glass transition temperature value of neat PLA was 63°C, whereas those of wood/PLA composites were lower. When wood and Zeomic were incorporated, PLA exhibited double melting peaks. Triclosan (1.0 and 1.5 wt%) demonstrated antibacterial activity against Staphylococcus aureus, as determined by plate count agar technique, whereas Zeomic did not. Biodegradation tests of neat PLA and wood/PLA composites showed that after a 60-day incubation period, the biodegradation rate of wood/PLA was higher than that of PLA. PLA and wood/PLA-containing Zeomic were found to degrade more quickly, suggesting that wood and Zeomic acted as biodegradation promoters. On the other hand, triclosan could be considered a biodegradation retarder since no biodegradation was observed for any triclosan-loaded samples during the initial 20 days of incubation, while neat PLA and wood/PLA composites began to degrade within the first few days.

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Flame Retardant Mechanisms of Red Phosphorus and Magnesium Hydroxide in High Impact Polystyrene

Macromolecular Chemistry and Physics ◽

10.1002/macp.200400255 ◽

2004 ◽

Vol 205 (16) ◽

pp. 2185-2196 ◽

Cited By ~ 146

Author(s):

Ulrike Braun ◽

Bernhard Schartel

Keyword(s):

Flame Retardant ◽

Magnesium Hydroxide ◽

High Impact ◽

Red Phosphorus ◽

High Impact Polystyrene

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Compatibilization of poly(lactic acid)/high impact polystyrene interface using copolymer poly(stylene-ran-methyl acrylate)

Journal of Applied Polymer Science ◽

10.1002/app.45799 ◽

2017 ◽

Vol 135 (6) ◽

pp. 45799 ◽

Cited By ~ 2

Author(s):

Xinghou Gong ◽

Xiang Gao ◽

Chak Yin Tang ◽

Wing-Cheung Law ◽

Ling Chen ◽

...

Keyword(s):

Lactic Acid ◽

Methyl Acrylate ◽

High Impact ◽

Poly Lactic Acid ◽

High Impact Polystyrene ◽

Copolymer Poly

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Flame Retardancy in UL-94 V-0 and in UL-94 5VA High Impact Polystyrene

Journal of Fire Sciences ◽

10.1177/073490419701500503 ◽

1997 ◽

Vol 15 (5) ◽

pp. 375-389 ◽

Cited By ~ 6

Author(s):

Lev Utevski ◽

Michael Scheinker ◽

Pierre Georlette ◽

Shoshana Lach

Keyword(s):

Flame Retardant ◽

Magnesium Hydroxide ◽

Flame Retardancy ◽

High Impact ◽

Antimony Trioxide ◽

High Impact Polystyrene ◽

Ul 94

The feasibility of producing HIPS of UL-94 5V flammability rating has been demonstrated. Results of TGA, XRD and SEM enable the role of such components as brominated organic flame retardant, antimony trioxide, chlorin ated polyethylene and magnesium hydroxide in flame retardancy of 5VA HIPS to be evaluated.

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