BIODEGRADABLE POLYMERIC DEVICES FOR ENVIRONMENT AND AGRICULTURE FRIENDLY-MANAGEMENT.

Rodrigo Ragazzi dos Santos; Renato Nallin Montagnolli; ROSELENA FAEZ

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Submission

Paper Title

BIODEGRADABLE POLYMERIC DEVICES FOR ENVIRONMENT AND AGRICULTURE FRIENDLY-MANAGEMENT.

Authors

Rodrigo Ragazzi dos Santos
Renato Nallin Montagnolli
ROSELENA FAEZ

Modality

Pôster

Subject area

Síntese e caracterização de materiais

Publishing Date

12/12/2023

Country of Publishing

Brasil

Language of Publishing

Inglês

Paper Page

https://www.even3.com.br/anais/workshop-do-ineo-2023/613078-biodegradable-polymeric-devices-for-environment-and-agriculture-friendly-management

ISBN

978-65-272-0088-8

Keywords

Fertilizers, controlled release, poly(vinyl alcohol) (PVA), starch.

Summary

The current production of arable crops requires using fertilizers to improve the productive potential and the use of planted areas. Enhanced efficiency fertilizers (EEFs) are characterized by materials that can coat the fertilizers, preventing their direct contact with the soil and causing the fertilizers to be released gradually. They have been used as an alternative for applying the necessary nutrients, attenuating losses, and keeping macro and micronutrients longer in the soil for better plant development, promoting more sustainable agriculture. EEFs are already commercialized; however, they are commonly composed of materials that are not biodegradable. The biggest challenge in this scenario is to develop EEFs composed of materials that degrade after fulfilling their function. For this, it is essential to understand how the biodegradation process occurs in soil and what factors influence it. This work developed an EEF using poly(vinyl alcohol) (PVA) as a matrix, which is a linear synthetic polymer that has the potential to biodegrade. Combined with PVA, a composite with starch was obtained, considering that starch, a natural polymer formed by amylose and amylopectin, is easily accessible, cheap, and biodegradable. We sought to test, above all, the hypothesis that the presence of starch in the composition of the EEF would favor the biodegradation process. We evaluated the biodegradation process in the soil of (PVA)/starch/nutrients-based EEFs using the Bartha respirometry method for 100 days. The EEFs were produced by spray drying (starch-nutrients), obtaining microspheres, and melt-processing (PVA/microspheres composites) in an internal mixing chamber (Haake Rheocord), the material obtained is pressed to get pellets. We compared the structural changes based on FTIR before and after the biodegradation process. After the biodegradation, we observed an increase in C=O band intensity at approximately 1645 cm-1. The phenomenon was observed by Linares (2019), where the increase in intensity and thinning of the carbonyl bands indicates starch degradation. In addition, the PVA degradation process, commonly catalyzed by the enzyme secondary alcohol oxidase (SAO), occurs by the cleavage of random C-C bonds that form products containing mainly methyl and carboxyl groups (HALIMA, 2016). Therefore, the increase in the intensity of the carbonyl bands may be related to changes in the starch structure and to the beginning of PVA degradation, which will increase the number of active carbonyl sites, possibly causing the observed phenomenon. According to the results, starch positively influences de biodegradation of PVA and allows this inexpensive polymer processing on a large scale. Acknowledgments The authors are grateful for grants 2021/14234-0 and 2019/02535-5 from FAPESP and INEO for ?nancially supporting this research. References LINARES, A. B. et al. Biodegradability study by FTIR and DSC of polymers films based on polypropylene and Cassava starch. Orbital, v. 11, n. 2, p. 71–82, 2019. BEN HALIMA, N. Poly(vinyl alcohol): Review of its promising applications and insights into biodegradation. RSC Advances, v. 6, n. 46, p. 39823–39832, 2016.

Title of the Event: Workshop do INEO 2023
City of the Event: Nazaré Paulista
Title of the Proceedings of the event: Anais do Workshop INEO 2023
Name of the Publisher: Even3
Means of Dissemination: Meio Digital

How to cite

SANTOS, Rodrigo Ragazzi dos; MONTAGNOLLI, Renato Nallin; FAEZ, ROSELENA. BIODEGRADABLE POLYMERIC DEVICES FOR ENVIRONMENT AND AGRICULTURE FRIENDLY-MANAGEMENT... In: Anais do workshop INEO 2023. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2023. Available in: https//www.even3.com.br/anais/workshop-do-ineo-2023/613078-BIODEGRADABLE-POLYMERIC-DEVICES-FOR-ENVIRONMENT-AND-AGRICULTURE-FRIENDLY-MANAGEMENT. Access in: 10/09/2024