Varied Pvdf Dissolution For Beta Phase Optimization In Casting And Electrospun Nanofibers

Todos os Trabalhos

Trabalho

Título do Trabalho

VARIED PVDF DISSOLUTION FOR BETA PHASE OPTIMIZATION IN CASTING AND ELECTROSPUN NANOFIBERS

Autores

André Antunes da Silva
Bruno Henrique de Santana Gois
Clarissa de Almeida Olivati
Roger C. Hiorns
Deuber Lincon da Silva Agostini

Modalidade

Apresentação - pôster (Clique aqui para saber os detalhes para submissão)

Área temática

Dispositivos eletrônicos e ópticos (OLED/OFET/OPVs/etc)

Data de Publicação

20/05/2022

País da Publicação

Brasil

Idioma da Publicação

Inglês

Página do Trabalho

https://www.even3.com.br/anais/workshopineo2022/474755-varied-pvdf-dissolution-for-beta-phase-optimization-in-casting-and-electrospun-nanofibers

ISBN

Palavras-Chave

PVDF, Dissolution, Beta phase, Electrospinning.

Resumo

Poly (vinylidene fluoride), PVDF, is a piezoelectric polymer that has been extensively studied due to its particular electrical and optical properties1. The beta crystalline phase is the most desirable in important technological applications such as sensors and actuators because it has better piezoelectric activities2. The objective of this work is to study the casting dissolution parameters of PVDF and PVDF nanofibers by electrospinning (for comparison) which is a simple and versatile technique to produce nanometer diameter fibers from a sufficiently viscous polymeric solution3 for nanogenerators and sensor of pressure. These piezoelectric devices are present in various technologies using in various arrangements, that is, this technological concept allows input signals to be converted into output responses, thus enabling, through different applications, the resolution of some sensory monitoring problems and even even power generation4. PVDF was dissolved in DMF and deposited on glass plates for drying, varying its concentration from 10% to 20% (w/w), dissolution time (2h to 24h) and temperature from 25°C to 70°C . These membranes deposited by casting were analyzed by FTIR to check their chemical and crystalline structures. For electrospinning, the solution was placed in a 3.0 mL syringe inside the infusion pump, setting the flow at 0.5 mL/h, keeping the needle at a distance of 15 cm from the collector. The power supply was maintaining the voltage at 15 kV by ejecting the solution to the rotating collector maintained at 300 rpm. The concentration of PVDF/solvent in both techniques was 15% (w/w). Through the FTIR spectra, we can calculate the relative percentage of the presence of the most predominant crystalline phase, comparing the ratio between beta and alpha phases present in PVDF in casting and in electrospun nanofibers. Through optical microscopy and/or scanning electron microscopy images, linearity, continuity and thickness can be observed in nanometric orders. The results of the electricity and DC conductivity tests will be used in the next step of this work to check the piezoelectricity by fingertests.

Título do Evento: Workshop INEO 2022
Título dos Anais do Evento: Anais do Workshop INEO 2022
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

SILVA, André Antunes da et al.. VARIED PVDF DISSOLUTION FOR BETA PHASE OPTIMIZATION IN CASTING AND ELECTROSPUN NANOFIBERS.. In: Anais do 16° Workshop do Instituto Nacional de Eletrônica Orgânica. Anais...São Carlos(SP) IFSC, 2022. Disponível em: https//www.even3.com.br/anais/workshopINEO2022/474755-VARIED-PVDF-DISSOLUTION-FOR-BETA-PHASE-OPTIMIZATION-IN-CASTING-AND-ELECTROSPUN-NANOFIBERS. Acesso em: 04/12/2024