caracterização de filmes de pvdf-β obtidos por diferentes técnicas characterization of β-pvdf films prepared at different conditions
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ID: 239281
2009
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Abstract
Filmes de poli(fluoreto de vinilideno), PVDF, na fase ferroelétrica β foram produzidos por diferentes técnicas: cristalização a partir da solução, estiramento mecânico e eletrofiação. Foi verificado por espectroscopia no infravermelho (FTIR) e microscopia eletrônica de varredura (MEV) que filmes obtidos a partir da cristalização por solução com dimetilformamida (DMF) a 60 °C apresentam exclusivamente a fase β não orientada. Filmes produzidos pelo estiramento uniaxial de filmes originalmente na fase α resultam predominantemente na fase β orientada, porém com uma pequena porcentagem da α. Mantas produzidas por eletrofiação são constituídas por nanofibras exclusivamente na fase β e com o eixo das cadeias preferencialmente orientados ao longo das fibras, paralelamente à superfície da manta. Medidas calorimétricas (DSC) verificaram que a porcentagem de cristalinidade e a temperatura de fusão foram pouco influenciadas pela técnica utilizada.
Poly(vinylidene fluoride) films, in the ferroelectric β phase, were prepared with different techniques: crystallization by solution, mechanical stretching and electrospinning. Using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), we observed that films obtained from crystallization in dimethylformamide (DMF) solution at 60 ºC contain only non-oriented β phase. Films obtained by uniaxial stretching at 80 ºC and draw ratio 4, of samples originally in the α phase, result predominantly in the oriented β phase, though with still a small amount of the α phase. Membranes prepared by electrospinning method are constituted by nanofibers exclusively in the β phase and with the chain axis preferably aligned along the fibers, parallel to the membrane surface. The crystallinity percentage and the melting temperature, both inferred from calorimetric measurements (DSC), were little influenced by the techniques employed.
Poly(vinylidene fluoride) films, in the ferroelectric β phase, were prepared with different techniques: crystallization by solution, mechanical stretching and electrospinning. Using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), we observed that films obtained from crystallization in dimethylformamide (DMF) solution at 60 ºC contain only non-oriented β phase. Films obtained by uniaxial stretching at 80 ºC and draw ratio 4, of samples originally in the α phase, result predominantly in the oriented β phase, though with still a small amount of the α phase. Membranes prepared by electrospinning method are constituted by nanofibers exclusively in the β phase and with the chain axis preferably aligned along the fibers, parallel to the membrane surface. The crystallinity percentage and the melting temperature, both inferred from calorimetric measurements (DSC), were little influenced by the techniques employed.
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costa2009polmeroscaracterizao
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| Authors | ;Lígia M. M. Costa;Rosário E. S. Bretas;Rinaldo Gregorio Filho |
| Journal | journal of the chemical society, perkin transactions 1 |
| Year | 2009 |
| DOI |
10.1590/S0104-14282009000300005
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