Abstract. Four temperatures of heat treatment had been used (110 ºC, 135 ºC, 150 ºC, and 160 ºC) to give different effects on the morphology of PVA nanofibers. Heat treatment changed the crystallinity of PVA nanofibers which was indicated by the changes of XRD FWHM spectral peaks, and the crystallite size. The changes in the intensity of FTIR spectral transmittance were also observed which might be caused by the differences temperature of heat treatment. The larger crystallite size and the smaller XRD FWHM spectral values indicated greater crystallinity of PVA nanofibers that was expected to increase the stability and physical properties of PVA nanofibers.

No abstract

No abstract

Abstract. Electrospun nanofibers membrane were fabricated from poly(vinyl alcohol)/chitosan (PVA/CS) with a mass ratio of 70/30 and 50/50 in 2% acetic acid solvent by electrospinning method. The morphology of nanofibers membrane of PVA/CS before-after heat treatment and effect after immersion in Glutaraldehyde was investigated by the field emission scanning electron microscopy (SEM). The diameter of PVA/CS 50/50 and 70/30 nanofibers was approximately 190 nm and 580 nm. Fourier Transform Infrared analysis demonstrated the existence of relevant functional groups of both PVA/CS 50/50 and 70/30 nanofibers. It is also shown that heat treatment increases the water resistance of PVA/CS membrane.

No abstract