Abstract
Polymeric thermal management materials (PTMMs) attained with expected thermally conductive performance and flame retardancy are still urgently being required. Herein, a novel phosphorus-containing polyester named poly(bis(1,1’-biphenoxyl)hexyl 5-(diphenylphosphoryl-amino)isophthalate) (PBHPI) was synthesized and incorporated into the epoxy resin (EP). After curing with 4,4’-diaminodiphenyl sulfone (DDS), in situ networks were obtained via reaction-induced phase separation (RIPS) between PBHPI and EPDDS, which induced the preferable distribution of boron nitride nanosheets (BNNSs) at the interface between the PBHPI-rich and EP-rich phases; therefore the photon transmission pathways were constructed. Due to the flame inhibition activity of PBHPI and the physical barrier effect of BNNSs, EPDDS/PBHPI/BNNSs composites exhibited expected fire safety performance of heat insulation and smoke suppression in cone calorimetry: the peak heat release rate (PHRR) reduced by 60%, total heat release (THR) by 40% and total smoke production (TSP) by 41%, compared with EPDDS. In addition, the incorporation of barely 1 wt% BNNSs improved the thermal conductivity of the composites. This work combining the molecular design of the novel phosphorus-containing polyester and the RIPS methods to construct in situ networks provided a feasible solution and unique insight into the design of PTMMs in a facile and convenient way.
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