Facile fabrication of PVA composite fibers with high fraction of multiwalled carbon nanotubes by gel spinning
| Autor: | Xinlong Ling, Liming Zou, Yongjing Xu, Hongwei Lu, Dengpan Lai, Yizhe Wei |
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| Rok vydání: | 2017 |
| Předmět: |
Vinyl alcohol
Thermogravimetric analysis Materials science Polymers and Plastics Composite number 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention chemistry.chemical_compound Crystallinity symbols.namesake Differential scanning calorimetry chemistry law Materials Chemistry symbols Crystallization Fourier transform infrared spectroscopy Composite material 0210 nano-technology Raman spectroscopy |
| Zdroj: | Polymer Engineering & Science. 58:37-45 |
| ISSN: | 0032-3888 |
| DOI: | 10.1002/pen.24528 |
| Popis: | Poly(vinyl alcohol) (PVA) composite fibers with high fraction of multiwalled carbon nanotubes (MWCNTs) were prepared by gel spinning process. Here, a modified process was introduced to prepare concentrated PVA/MWCNTs/DMSO spinning dope, and to attain good dispersion of MWCNTs in the fibers. The final composite fibers were studied by thermogravimetric analyzer (TGA), Fourier transform infrared spectrometer (FTIR), Raman spectroscopy, differential scanning calorimetry (DSC), and WAXD analysis. The total content of MWCNTs in PVA composite fibers, from 5 to 30 wt%, was confirmed by TGA analysis. FTIR and Raman measurements demonstrated the existence of strong hydrogen interaction between MWCNTs and PVA matrix. SEM images of composite fibers showed smooth surface, regular cross-section shape and good dispersion of MWCNTs in the fibers. DSC analysis showed that the crystallinity first increased and then decreased with the increase of MWCNTs contents. It can be concluded that low concentration of MWNCTs can act as nucleation sites for crystallization of PVA component, and large amount of MWCNTs may impede the crystallization of PVA component. The WAXD analysis results indicated that the crystal orientation of the PVA component in PVA composite fibers is almost identical at the same drawn ratio. Polarized Raman analysis indicated a small increase in MWCNTs orientation for the composite fibers. The mechanical properties tests showed that the composite fibers exhibit significant improvement in tensile strength and modulus as compared to the neat PVA fibers. The composite fibers also showed sustained growth in electrical conductivity. POLYM. ENG. SCI., 2017. © 2017 Society of Plastics Engineers |
| Databáze: | OpenAIRE |
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