Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 304, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201900137
Keywords
gas atmospheres; gas pressures; polybenzoxazine aerogels; thermal conductivity; thermal insulation
Funding
- National Natural Science Foundation of China [51302317, 51702360]
- Natural Science Foundation of Hunan Province [2018JJ2469]
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Polybenzoxazine (PBO) aerogels with low densities and low thermal conductivities are prepared from Bisphenol A (BPA) benzoxazine monomers by ring-opened polymerisation using HCl as a catalyser at 10 degrees C. The obtained PBO aerogels have cross-linked and 3D network structures with the densities ranging from 0.084 to 0.526 g cm(-3). The thermal conductivities under different pressures (3-10(5) Pa, air) and different atmospheres (N-2, Ar, and CO2, 10(5) Pa) are investigated. The thermal conductivities are in the range of 0.0335-0.0652 W m K-1 under ambient pressure and 0.0098-0.0571 W m K-1 at 3 Pa. The thermal transfer mechanism under different gas pressures is analyzed with increasing pressure. Under different atmospheres, the thermal conductivities decrease as the molecular weight of the gas increases. Compared with the traditional organic foam insulating materials of phenolic foam, polyurethane and polystyrene, which have similar apparent densities, PBO aerogels exhibit lower thermal conductivity of 0.0335 W m K-1 than that of traditional organic foam at room temperature.
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