Journal
POLYMER
Volume 153, Issue -, Pages 616-625Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2018.08.068
Keywords
Rigid polyurethane foams; Persistent flame retardancy; Compatibility; Thermal insulation; Mechanical property
Categories
Funding
- National Natural Science Foundation of China [51320105011, 51503191, 51721091]
- Fundamental Research Funds for the central Universities
- Sichuan Province Youth Science and Technology Innovation Team [2017TD0006]
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In an effort to overcome issues encountered in additive flame retardants for rigid polyurethane foams (RPUFs), a novel reactive flame-retardant triol (TDHTPP) based on a triazine and phosphate structure was designed and synthesized. This triol was chemically incorporated in the main chains of RPUFs as a chain-extender to prepare inherently flame-retardant RPUFs. TDHTPP showed good solubility in the polyols (polyol 4110 and PEG 400) of RPUF, making it convenient for industrial fabrication, such as in spay foaming. Excellent compatibility of TDHTPP with the polymer matrix endowed flame-retardant RPUFs (FR-RPUFs) much higher compressive strength than that of the neat RPUF, and a low thermal conductivity of similar to 0.03 W/(m.K). Notably, with only 5 wt % of TDHTPP incorporated, the resultant RPUF displayed a UL-94 V-0 rating and more importantly, exhibited a great persistent flame retardancy during thermal accelerated aging tests at 140 degrees C for 96 h. Further characterization revealed that TDHTPP possessed both vapor-phase and condensed-phase flame-retardant behaviors, in which, vapor-phase action was dominant. This work provides a facile route to synthesize RPUFs with persistent flame retardancy, excellent thermal insulation and mechanical properties.
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