PENGARUH KONSENTRASI PELARUT ASAM ASETAT TERHADAP MUNCULNYA �BEAD� PADA NANOFIBER PVA/KITOSAN

• Main Authors: , M. Solihul Mu'min, , Dr. Kuwat Triyana
• 格式: Theses and Dissertations NonPeerReviewed
• 出版: [Yogyakarta] : Universitas Gadjah Mada 2014
• 主題: ETD
• 在線閱讀: https://repository.ugm.ac.id/133777/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=74595

Electrospinning of PVA/chitosan solutions has been carried out to obtain nanofiber with small and uniform in diameter without bead structure. In this research, PVA/chitosan solutions were prepared in the acetic acid with the range of concentration from 1% to 20% and mass ratio of PVA to chitosan is from 10/1 to 10/3. The applied voltage and distance between spineret to collector were set at 15 kV and 14 cm, respectively. The solution properties of PVA/chitosan were also measured such as, conductivity, pH, viscosity, and surface tension. The additon of acetic acid concentration decrease conductivity, pH, and surface tension of the solution, while viscosity in the solution increase. It is because of more repulsive forces occur between charged molecule in the solution at higher acetic acid concentration. Electrospun PVA/chitosan nanofiber diameters for 1%, 5%, 10%, 15%, and 20% acetic acid were 160 nm±18, 134±11 nm, 101±11 nm, 95±18 nm, and 63±12 nm, respectively. The more acetic acid in solution, however, the more beads will appear. Electrospun PVA/chitosan nanofiber with free of beads is produced from PVA/chitosan solutions with mass ratio 10/2 and fiber diameter obtained is 120±12 nm. Additon of mass ratio become 10/3 makes the the solution more difficult to electrsospin and lead to very slow nanofiber production. FTIR spectra showed that electrospun nanofiber consist of PVA and chitosan. Meanwhile, XRD data showed that nanofiber from PVA/chitosan blend has very lower crystallinity than nanofiber from pure PVA. The nanofiber also can maintain its fiber structure after soaking in KOH 40 wt% solution for 24 hours and potentially behave to be electrolyte membrane for fuel cells application.