Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 15, Pages 6915-6924Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am401703m
Keywords
immiscible blends; polymer nanocomposite; selective extraction; cocontinuity; cone calorimeter
Funding
- NSF of China [51073015, 51207009]
- Beijing Municipal Excellent Scholars [2011D009006000005]
- State Key Laboratory of Power Transmission Equipment and System Security at Chongqing University [2007DA10512712406]
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The effect of selective localization of silicon carbide (SiC) and polystyrene (PS)-coated SiC (p-SiC) nanoparticles on the thermal conductivity and flame retardancy of immiscible PS/poly(vinylidene fluoride) (PVDF) blends has been systematically studied. The scanning electron microscopy (SEM) images reveal that SIC and p-SiC nanoparticles have different selective localizations in the PS/PVDF blends. The melting and crystallization behaviors of the PVDF component investigated by using differential scanning calorimetry are consistent with the SEM results. To reduce the volume fraction of fillers in the composites, a cocontinuous structure of PS/PVDF has also been built up. The cocontinuity window for PS/PVDF blends is similar to 30-70 vol % according to the selective solvent dissolution technique. The selective localization of SiC in the PVDF phase of the PS/PVDF 70/30 blends produces a slightly higher thermal conductivity than that of p-SiC in the PS phase of the PS/PVDF 30/70 blends. However, the composites with selective localization of p-SiC exhibit the best combined properties of thermal conductivity and flame retardancy.
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