Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/article/doi/10.1590/0104-1428.20240082
Polímeros: Ciência e Tecnologia
Original Article

Oxygen anomalous diffusion during photooxidation of polypropylene

José William de Lima Souza; Lucas Cordeiro de Oliveira; Taynah Pereira Galdino; Marcus Vinicius Lia Fook; Rômulo Feitosa Navarro

http://dx.doi.org/10.1590/0104-1428.20240082 Polímeros: Ciência e Tecnologia, vol.35, n2, e20250024, 2025
PDF
SciELO
Downloads: 0
Views: 32

Abstract

This research paper is about the calculation of the diffusion coefficient and the oxygen concentration profile along polypropylene samples exposed to photooxidation in a dry environment. In this degradation process, oxygen diffusion is anomalous, as it is affected by structural modifications that occur over the exposure time. Thus, the diffusion coefficient starts to depend on time and the common solutions for Fick's 2nd Law for diffusion become inoperative for importante time intervals. In this work, a modification is proposed in the calculation of the diffusivity and, consequently, of the solution for the oxygen concentration profile in diffusion.

 

Keywords

anomalous diffusion, diffusion coefficient, oxygen diffusivity, photooxidation, time dependent

References

1 Rajakumar, K., Sarasvathy, V., Chelvan, A. T., Chitra, R., & Vijayakumar, C. T. (2009). Natural weathering studies of polypropylene. Journal of Polymers and the Environment, 17(3), 191-202. http://doi.org/10.1007/s10924-009-0138-7.

2 Ibrahim, A. M. (2024). Plastics: photodegradations and mechanisms. In V. Sivasankar & T. G. Sunitha (Eds.), Microplastics and pollutants (pp. 25-49). Cham: Springer. http://doi.org/10.1007/978-3-031-54565-8_2.

3 Liu, X., & Yang, R. (2020). Conversion among photo-oxidative products of polypropylene in solid, liquid and gaseous states. BMC Chemistry, 14(1), 44. http://doi.org/10.1186/s13065-020-00698-y. PMid:32696017.

4 Rabello, M. S., & White, J. R. (1997). The role of physical structure and morphology in the photodegradation behaviour of polypropylene. Polymer Degradation & Stability, 56(1), 55-73. http://doi.org/10.1016/S0141-3910(96)00202-9.

5 Costa, F. S., Oliveira, E. C., & Plata, A. R. G. (2021). Fractional diffusion with time-dependent diffusion coefficient. Reports on Mathematical Physics, 87(1), 59-79. http://doi.org/10.1016/S0034-4877(21)00011-2.

6 Navarro, R. F., d’Almeida, J. R. M., & Rabello, M. S. (2007). Elastic properties of degraded polypropylene. Journal of Materials Science, 42(6), 2167-2174. http://doi.org/10.1007/s10853-006-1387-7.

7 Mangat, P. S., & Molloy, B. T. (1994). Prediction of long term chloride concentration in concrete. Materials and Structures, 27(6), 338-346. http://doi.org/10.1007/BF02473426.

8 Takewaka, K., & Mastumoto, S. (1988). Quality and cover thickness of concrete based on the estimation of chloride penetration in marine environments. ACI Symposium Publication, 109, 381-400. http://doi.org/10.14359/2124.

9 Hristov, J. (2017). Subdiffusion model with time-dependent diffusion coefficient: integral-balance solution and analysis. Thermal Science, 21(1), 69-80. http://doi.org/10.2298/TSCI160427247H.

10 Müller‐Plathe, F. (1992). Molecular dynamics simulation of gas transport in amorphous polypropylene. The Journal of Chemical Physics, 96(4), 3200-3205. http://doi.org/10.1063/1.461963.

12 Mucha, M. (1986). Oxygen uptake by isotactic polypropylene of different morphological structure. Colloid & Polymer Science, 264(2), 113-116. http://doi.org/10.1007/BF01414835.

13 Rouillon, C., Bussiere, P.-O., Desnoux, E., Collin, S., Vial, C., Therias, S., & Gardette, J.-L. (2016). Is carbonyl index a quantitative probe to monitor polypropylene photodegradation? Polymer Degradation & Stability, 128, 200-208. http://doi.org/10.1016/j.polymdegradstab.2015.12.011.
 

68a7201ba9539549a028b89a polimeros Articles
Links & Downloads
1678-5169 (Electronic) 0104-1428 (Printed)
Polímeros: Ciência e Tecnologia ©2025 All rights reserved.

Polímeros: Ciência e Tecnologia

Share this page
Page Sections