Mechanical property improvement and fire hazard reduction of ammonium polyphosphate microencapsulated in rigid polyurethane foam

2019 ◽  
Vol 137 (4) ◽  
pp. 48307
Author(s):  
Shaoxiang Li ◽  
Yue Zhou ◽  
Jiaji Cheng ◽  
Qianyu Ma ◽  
Feng Zhang ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Polyurethane Foam ◽  
Fire Hazard ◽  
Ammonium Polyphosphate ◽  
Rigid Polyurethane Foam ◽  
Hazard Reduction ◽  
Fire Hazard Reduction

scholarly journals Density Effect on Flame Retardancy, Thermal Degradation, and Combustibility of Rigid Polyurethane Foam Modified by Expandable Graphite or Ammonium Polyphosphate

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 668 ◽  
Author(s):  
Yang ◽  
Liu ◽  
Jiang ◽  
Chen ◽  
Wan
Keyword(s):  
Weight Loss ◽  
Thermal Degradation ◽  
Heat Release ◽  
Polyurethane Foam ◽  
Apparent Density ◽  
Flame Retardancy ◽  
Ammonium Polyphosphate ◽  
Expandable Graphite ◽  
Rigid Polyurethane Foam ◽  
Combustion Behaviors

The current study aims at comparatively investigating the effect of apparent density on flame retardancy, thermal degradation and combustion behaviors of rigid polyurethane foam (RPUF), RPUF/ expandable graphite (EG) and RPUF/ ammonium polyphosphate (APP). A series of RPUF, RPUF/EG and RPUF/APP samples with different apparent densities (30, 60 and 90 kg/m3) were prepared. The flame retardancy, thermal degradation, and combustion behaviors of each sample were investigated. Limiting oxygen index (LOI) results indicated that increasing apparent density was beneficial to the flame retardancy of all foam systems. The effect of apparent density on the enhancement of flame retardancy followed the sequence of RPUF < RPUF/APP < RPUF/EG. Thermogravimetric analysis (TGA) results showed that an increase in the apparent density can cause more weight loss in the first degradation stage and less weight loss in the second degradation stage for all foam systems. The combustion behaviors also showed significant differences. The samples with a higher apparent density showed a longer duration of heat release and higher total heat release (THR). The findings in this study demonstrated that apparent density played an important role in flame retardancy, thermal degradation, and combustion behaviors of RPUF, which must be paid more attention in the studies of flame-retardant RPUF.

Case history studies of the effects of vegetation succession and fire on the moth Fraus simulans (Lepidoptera, Hepialidae) and its food plant, the sedge Ecdeiocolea monostachya (Ecdeiocoleacea) in the Western Australian Wheatbelt: implications for retenti

2001 ◽  
Vol 7 (2) ◽  
pp. 93 ◽  
Author(s):  
A. R. Main
Keyword(s):  
Risk Assessment ◽  
Case History ◽  
Decision Process ◽  
Fire Hazard ◽  
Vegetation Succession ◽  
Field Observations ◽  
Hazard Reduction ◽  
Western Australian ◽  
Fire Hazard Reduction ◽  
Survival Of Seedlings

Field observations of the effects of succession of vegetation, grazing by the moth Fraus simulans on the sedge Ecdeiocolea monostachya in a long unburnt area, the post-fire survival and regeneration of established tussocks and the survival of seedlings germinating in the first winter following burning are presented. There was considerable post-fire mortality of the established tussocks and in only one of the three areas burnt did any of the seedlings survive successive summer droughts. Surviving seedlings did not replace the tussocks killed by the burning. The possible effects of fire, drought and insect grazing on the biotic composition of small reserves are discussed. It is suggested that the information presented provides a basis for a formal decision process for risk assessment when managing reserves for retention of biodiversity and fire hazard reduction.

Potential biomass and logs from fire-hazard-reduction treatments in Southwest Oregon and Northern California

2008 ◽  
Vol 10 (6) ◽  
pp. 400-407 ◽  
Author(s):  
R. James Barbour ◽  
Jeremy S. Fried ◽  
Peter J. Daugherty ◽  
Glenn Christensen ◽  
Roger Fight
Keyword(s):  
Fire Hazard ◽  
Northern California ◽  
Hazard Reduction ◽  
Southwest Oregon ◽  
Fire Hazard Reduction

scholarly journals Development of Vegetation and Surface Fuels Following Fire Hazard Reduction Treatment

Forests ◽  
2012 ◽  
Vol 3 (3) ◽  
pp. 700-722 ◽  
Author(s):  
Lindsay A. Chiono ◽  
Kevin L. O’Hara ◽  
Michael J. De Lasaux ◽  
Glenn A. Nader ◽  
Scott L. Stephens
Keyword(s):  
Fire Hazard ◽  
Reduction Treatment ◽  
Hazard Reduction ◽  
Fire Hazard Reduction
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