Journal
MATERIALS & DESIGN
Volume 192, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2020.108668
Keywords
Tung oil; PF; Toughen; Flame-retardancy; Smoke-suppression
Categories
Funding
- National Natural Science Foundation of China [31670577]
- National Key Research and Development Program of China [2017YFD0601003]
- China Academy of Forestry Sciences [CAFYBB2018ZC004]
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Phenolic foam (PF) is widely used as exterior-wall insulation material but has poor mechanical properties and high friability. To improve the robustness of PF without sacrificing its inherent advantages, a novel reactive tung oil-based toughener that contains P and Si is synthesized and embedded into the rigid molecular structure of PF as long, flexible chains to fabricate biomass-based PFs (TDKPFs). The introduction of these long, flexible chains effectively improved the compressive and bending strengths, which were almost 180% and 198% that of pure PF, respectively. The TDKPFs had a lower thermal conductivity of 0.0316W/(m.K), suggesting superior thermal insulation. Notably, these TDKPFs solved the reduction in flame resistance that is caused by the introduction of alkyl long chains and had a high limiting oxygen index of 41.7%. Cone calorimetry tests indicated that the peak heat-release rate of the TDKPFs was reduced by 15.6%. In particular, the total smoke release of the TDKPFs was 7.29m(2)/m(2), a reduction of 75.8% over pure PF (30.2 m(2)/m(2)), indicating superior smoke-suppression. The mechanism analysis revealed that a compact hybrid barrier with rich polyphosphate and silica formed, inhibiting the transfer of heat, O-2, and mass during combustion. Thus, TDKPFs have great potential as insulation materials. (C) 2020 The Authors. Published by Elsevier Ltd.
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