Nano/microfibers of EVA copolymer obtained by solution blow spinning: Processing, solution properties, and pheromone release application

ABSTRACT Pheromones have been used for monitoring and control of insect pests in crops, reducing the use of pesticides. However, among obstacles for this technology to be more useful, is the control and time to release. In this way, this work aims the evaluation of the release of pheromones using mi...

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Published in:Journal of applied polymer science 2019-06, Vol.136 (24), p.n/a
Main Authors: Rempel, Silvana Pereira, Engler, Leonardo Galli, Soares, Márcio R. F., Catafesta, Jadna, Moura, Sidnei, Bianchi, Otávio
Format: Article
Language:English
Subjects:
Citrus fruits
Copolymers
Emission analysis
Ethylene vinyl acetates
Feed rate
fibers
Field emission microscopy
Insects
Materials science
Microfibers
Morphology
Nanofibers
Pesticides
Pests
pheromone release
Pheromones
Polymers
rheology
Scanning electron microscopy
Solubility parameters
Thermogravimetry
X-ray diffraction
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Summary:ABSTRACT Pheromones have been used for monitoring and control of insect pests in crops, reducing the use of pesticides. However, among obstacles for this technology to be more useful, is the control and time to release. In this way, this work aims the evaluation of the release of pheromones using micro/nanofibers of ethylene–vinyl acetate (EVA) produced by blow spinning. Solutions with 0.5–15 wt % EVA were prepared based on the solubility parameter of the copolymer. Fibers were obtained from solutions in the semidiluted concentration regime. Synthetic sex pheromones from the oriental fruit moth, Grapholita molesta and citrus leafminer Phyllocnistis citrella were incorporated into the micro/nanofibers. The morphology and structure of these fibers were evaluated employing field emission scanning electron microscopy and wide‐angle X‐ray diffraction. The fibers sizes (95–426 nm) were dependent on the feed rate of the solution. As a result, pheromone release has occurred linearly over 10 weeks, as determined by thermogravimetry analysis. The solubility parameter influences the amount incorporated in the fiber and the rate of pheromone release. The proposed fiber/pheromone system is interesting since it reduces the use of actives and can be used in several planting cycles and reused. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47647.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.47647