No abstract

The poly (vinylidene fluoride)/poly (methyl methacrylate)(PVDF/PMMA) composite fibrous membranes with different blend ratio for use as separator of lithium-ion batteries have been developed by electrospinning technique. The surface morphology and crystal structure of electrospun PVDF/PMMA composite fibrous membranes are characterized using scanning electron microscopy (SEM), attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy and differential scanning calorimetry (DSC).The results indicated that the addition of PMMA into PVDF increased the fiber diameter, decreased the crystalline of electrospun composite fibrous membranes and the good molecular level interaction between these two polymers were obtained. Meanwhile,electrospun PVDF/PMMA (90/10) composite fibrous membranes exhibited the highest ionic conductivity of 2.54×10-3S/cm at room temperature with electrochemical stability of up to 5.0V.

The electrospinning technique was used to prepare the Polyethylene Terephthalate (PET) mats. The electrospun PET mats with different fiber diameters have many applications such as biotechnological and biomedical, functional coating, lithum-ion membrane and filtering membrane and so on. Several techniques including scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and single fiber electronic tensile strength tester were used to characterize the electrospun PET mats before/after thermal treatment. When choosing the suitable temperature, the thermal treatment could improve the tensile properties without damage the structure of electrospun PET nanofiber mat, if the suitable temperature was been choosed.

Poly (vinylidene fluoride) (PVDF) / poly(methyl methacrylate) (PMMA) composite membrane was produced by the electrospinning technique. Thermal treatment was introduced to improve the mechanical property and dimensional stability. In this paper, the PVDF/PMMA membranes before and after thermal treatment were characterized by Scanning electron microscope (SEM), differential scanning calorimeter (DSC) , pore size and porosity test, electrolyte uptake test and tensile test. The pore size, porosity, electrolyte uptake rate, tensile property, as well as melting temperature and crystallinity changed with the treated temperature. The results show that thermal treatment could notably increase the tensile property of electrospun PVDF/PMMA composite membrane and 160°C is a proper temperature for thermal treating.

No abstract