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MOHAMMAD MAHDI ABOLHASANI,Qipeng Guo,AZAM JALALI-ARANI,MINOO NAEBE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.6
Poly(vinylidene fluoride) (PVDF) nanocomposites were prepared by melt-mixing. The dispersionof clay platelets and rheology of nanocomposites were analyzed using X-ray diffraction (XRD),scanning electron microscopy (SEM), transmission electron microscopy (TEM) and rheometricmechanical spectrometer (RMS). The transformation of α to β and γ phase in PVDF was inducedby the addition of nanoclay and subsequently the isothermal crystallization kinetics of neat PVDF and its nanocomposite have been investigated. The interaction between clay nanofillers and PVDF macromolecular chains induced the change of conformation from trans-gauche to all-trans crystal structure in PVDF segment. The isothermal crystallization of PVDF/clay nano-composites was carried out by Differential Scanning Calorimetry (DSC) technique. The influence of clay platelets on nucleation crystallization rate and Avrami exponent were studied. PVDF/clay nanocomposite showed higher crystallization rate indicating that nanoclay has acted as an effective nucleation agent. This nucleation effect of nanoclay increased the Avrami exponent anddecreased the degree of crystallinity.