Halogen Free flame retardant rigid polyurethane foam with a novel phosphorus−nitrogen intumescent flame retardant

ABSTRACT A novel phosphorous‐nitrogen containing intumescent flame retardant, toluidine spirocyclic pentaerythritol bisphosphonate (TSPB), was synthesized and characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR). Flame retardant rigid polyurethane foams (...

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Bibliographic Details
Published in:Journal of applied polymer science 2014-06, Vol.131 (11), p.np-n/a
Main Authors: Wu, Deng-Hui, Zhao, Pei-Hua, Liu, Ya-Qing, Liu, Xue-Yi, Wang, Xiao-feng
Format: Article
Language:English
Subjects:
Applied sciences
Cellular
Combustion
Compounding ingredients
Exact sciences and technology
Fireproof agents
flame retardance
Flame retardants
foams
Forms of application and semi-finished materials
Fourier transforms
functionalization of polymers
Infrared spectroscopy
Intumescent
Materials science
mechanical properties
Polymer industry, paints, wood
Polymers
Polyurethane foam
polyurethanes
Ratings
Scanning electron microscopy
Technology of polymers
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Summary:ABSTRACT A novel phosphorous‐nitrogen containing intumescent flame retardant, toluidine spirocyclic pentaerythritol bisphosphonate (TSPB), was synthesized and characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR). Flame retardant rigid polyurethane foams (TSPB‐RPUF) were prepared by using TSPB. The flame retardancy of TSPB on rigid polyurethane foams (RPUF) was investigated by the limiting oxygen index (LOI), vertical burning test, thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and FTIR. The results showed TSPB exhibited better compatibility with RPUF and lesser negative influence on the mechanical properties of TSPB‐RPUF. When the content of TSPB was 30 pph, the LOI of TSPB‐RPUF could reach 26.5%, and a UL‐94 V‐0 rating was achieved. Furthermore, the TSPB‐RPUF exhibited an outstanding water resistance that it could still obtain a V‐0 rating after water soaking. TGA showed the charring ability of RPUF was relatively poor, However, the residual weight of TSPB‐RPUF was improved greatly. SEM and FTIR indicated the intumescent chars formed from TSPB‐RPUF were compact and smooth, which was a critical factor for protecting the substrate material from burning. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39581.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.39581