Cellulose acetate (CA) is a biocompatible, nontoxic polymer widely used in polymeric film production. In this study, epoxidized soybean oil (ESO) and citronella oil (CO) were incorporated into CA films in varying proportions to evaluate their plasticizing effects and potential insect-repellent properties for agricultural applications.
The chemical composition of CO was analyzed using gas chromatography coupled with mass spectrometry (GC-MS), revealing that citronellal, geraniol, and citronellol constitute approximately 70% of the oil. Fourier Transform Infrared Spectroscopy (FTIR) revealed minimal structural changes due to the low oil content, while Differential Scanning Calorimetry (DSC) demonstrated a reduction in glass transition temperature (Tg) with both ESO and CO, with CO showing a more pronounced plasticizing effect. Scanning Electron Microscopy (SEM) images suggested stronger interfacial interaction between the CA matrix and CO compared to ESO. Tensile tests confirmed improved mechanical properties across all concentrations. Repellency studies targeting Bemisia tabaci assessed insect mortality and oviposition. Films with higher CO concentrations achieved 100% mortality within 24 h and effectively prevented oviposition, demonstrating substantial repellency.
These results highlight the potential of CA films containing CO and ESO as sustainable mulching films, combining enhanced mechanical performance, insect repellency, and reduced reliance on synthetic insecticides.
Rezende, G. M., De Souza, E. G., Dos Reis, M. V., Haddi, K., De Oliveira, J. E., & Gil, C. S. B. (2025). Citronella oil incorporated into active mulching films for insect control in strawberry crop. ACS Agricultural Science & Technology, Article 5c00451. https://doi.org/10.1021/acsagscitech.5c00451
Source: ACS Publications
