Abstract
The crystallization behaviours of amorphous poly(vinylidene fluoride) (PVDF) nanocompositesmodified with two different kinds of molybdenum disulfide (MoS₂) at different filler loadings were investigated in detail in this work. The crystallinity, melting temperature and crystallization temperature of the PVDF/MoS₂ nanocomposites were transformed from α-phase to β-phase with the addition of MoS₂, MoS₂-COOH and MoS₂-NH₂. During isothermal cold crystallization, the overall crystallization rate of PVDF was slowed with increased MoS₂ loading relative to that of neat PVDF. Moreover, the crystallization temperature of the PVDF nanocomposites increased with the addition of MoS₂ despite the cooling rate during nonisothermal cold crystallization. DMA tests showed that the storage modulus of PVDF was decreased with the addition of MoS₂, while those of PVDF/MoS₂-COOH and PVDF/MoS₂-NH₂ were enhanced to different degrees. The decomposition of the PVDF/MoS₂ nanocomposites were also discussed. Relative to neat PVDF, the thermal stability of PVDF was obviously improved with the addition of MoS₂, MoS₂-COOH and MoS₂-NH₂, which could be ascribed to the increased degree of crystallinity.
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