Journal
JOURNAL OF POLYMER RESEARCH
Volume 20, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1007/s10965-013-0234-1
Keywords
Rigid polyurethane foam; Thermal stability; Fire Performance; Mechanical properties
Categories
Funding
- National Basic Research Program of China (973 Program) [2012CB719701]
- National Key Technology RD Program [2013BAJ01B05]
- Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials [11ZXFK12]
- China Postdoctoral Science Foundation [2012 M511418, 2013 T60621]
- Fundamental Research Funds for the Central Universities
- National Natural Science Foundation of China [51203146]
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Halogen-free flame retardant rigid polyurethane foams (RPUF) were synthesized by substituting a part of polyther polyol with polyol-modified lignin and filled with phenolic encapsulated ammonium polyphosphate (PFAPP). Lignin was chemically modified with flame retardant elements, phosphorous, via a three-step reaction. The foams maintained a regular cell structure and had even smaller average cell size than pure foam. The effects of lignin polyol and PFAPP on the apparent density, compressive strength were discussed. The thermal stability, flame retardant properties and mechanical properties of the foams are improved. Compared with pure foam (0.2 % char residue at 700 degrees C), modified foam with lignin and PFAPP exhibits much higher char formation (42.7 % char residue at 700 degrees C). The FR properties of these modified foams were evaluated by cone calorimeter and limiting oxygen index (LOI). The modified lignin in foam system further reduces the heat release rate and shows the combustion process. The addition of 15 % PFAPP and 10 % modified lignin into RPUF led to a considerable increase of the compressive strength with respect to the neat RPUF.
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