Effect of stimuli-responsive polydiacetylene on the crystallization and mechanical properties of PVDF nanofibers
| Autor: | Mehdi Sadrjahani, Masoud Latifi, Shohre Rouhani, Najmeh Moazeni, Ali Akbar Merati |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polymers and Plastics Diacetylene 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Polyvinylidene fluoride Electrospinning 0104 chemical sciences law.invention chemistry.chemical_compound Crystallinity chemistry Chemical engineering law Nanofiber Ultimate tensile strength Materials Chemistry Crystallization Fourier transform infrared spectroscopy 0210 nano-technology |
| Zdroj: | Polymer Bulletin. 77:5373-5388 |
| ISSN: | 1436-2449 0170-0839 |
| Popis: | To improve the β-phase content of polyvinylidene fluoride (PVDF), diacetylene (DA) monomers were embedded in PVDF nanofibers. The PVDF/DA nanofiber membranes were fabricated using the electrospinning technique and polymerized to form polydiacetylene (PDA) after UV irradiation. In this study, the effect of PDA on the crystalline structure of PVDF nanofibers was examined and compared with cast films. The nanofiber morphology was assessed by SEM, while Fourier transform infrared spectroscopy and wide-angle X-ray diffraction were performed to characterize the crystallinity behavior. The mechanical properties and crystal polymorphism of the electrospun PVDF/DA nanofibers were also studied before irradiation, after irradiation and after colorimetric transition induced by the heat treatment. The results showed that the addition of PDA can effectively improve β-phase crystalline PVDF in both the as-cast film and the electrospun nanofibers which is greater in the latter. The electrospun PVDF/DA nanofibers after UV irradiation exhibit greater intensity of β-phase in comparison with those before irradiation. Furthermore, the fraction of β-phase decreased when the blue phase of the PVDF–PDA nanofibers undergoes a heat-induced thermochromic transition to a red phase. The tensile strength and elongation at break as well as the tensile modulus were notably improved after heat treatment of the electrospun PVDF–PDA nanofibers. |
| Databáze: | OpenAIRE |
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