| Investigation of the crystal polymorphism of electrospun polyvinylidene fluoride/polydiacetylen composite nanofibers |
| Paper ID : 1441-UFGNSM-FULL |
| Authors: |
|
Najmeh Moazeni *1, Ali Akbar Merati2, Masoud Latifi3, Mehdi Sadrjahani4, Shohre Rouhani5 1tehra, Amirkabir university of technology 22Advanced Textile Materials and Technology (ATMT) Research Institute, Textile Engineering Department, Amirkabir University of Technology, Tehran, Iran 3Textile Engineering Department, Textile Research and Excellence, Centers, Amirkabir University of Technology, Tehran, Iran. 4Textile Engineering Department, Textile Research and Excellence Centers, Amirkabir University of Technology, Tehran, Iran 5Department of Organic Colorants, Institute for Color Science and Technology, Tehran, Iran |
| Abstract: |
| The piezoelectric properties of polyvinylidene fluoride (PVDF) depend mainly on the β-phase content and degree of crystallinity. In this study, the polydiacetylene (PDA) was embedded in electrospun PVDF nanofibers to improve these characteristics. The self-assembly of diacetylene monomers occurred during the electrospinning process. The assembled diacetylene monomers in the PVDF nanofibres were further polymerized to form PDA with alternating ene–yne main chains under UV light irradiation. The morphology and crystal polymorphism of electrospun composite nanofibers of PVDF/PDA were investigated using scanning electron microscopy (SEM), Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), and wide angle X-Ray diffraction (WAXD). SEM images shows that addition of PDA can increase the diameter of the nanofibers due to the increase of electrospinning solution viscosity. Infrared spectroscopy and X-ray diffraction demonstrate that PDA has the effect of inhibiting the growth of non-polar α phase crystals, while promoting the growth of polar β phase. The content of β phase for pure PVDF and PVDF/ PDA composite nanofibers was characterized 63% and 86%, respectively. This could be achieved because the carboxyl groups on PDA would force the fluorine atoms in PVDF to be in the trans-conformation. Finally, an interaction mechanism suggested to explain the crystal polymorphism behavior in electrospun PVDF/PDA composite nanofibers. |
| Keywords: |
| polyvinylidene fluoride (PVDF); polydiacetylene (PDA); composite; nanofibers |
| Status : Paper Accepted (Poster Presentation) |
