Nowadays, thinking about solutions for sustainable development is a priority in every field and industrial sector. Sustainability is, in fact, essential to ensure a healthy future for the next generations. In this context, the circular economy is becoming the new paradigm to overcome the limits of a linear economy (Geissdoerfer et al., 2020 Geissdoerfer, M., Pieroni, M. P. P., Pigosso, D. C. A., & Soufani, K. (2020). Circular business models: a review. Journal of Cleaner Production, 277, 123741. http://dx.doi.org/10.1016/j.jclepro.2020.123741. http://dx.doi.org/10.1016/j.jclepro.2020... ; Kirchherr et al., 2017 Kirchherr, J., Reike, D., & Hekkert, M. (2017). Conceptualizing the circular economy: an analysis of 114 definitions. Resources, Conservation and Recycling, 127, 221-232. http://dx.doi.org/10.1016/j.resconrec.2017.09.005. http://dx.doi.org/10.1016/j.resconrec.20... ). With Agribusiness being one of the most polluting sectors (Food and Agriculture Organization of the United Nations, 2020 Food and Agriculture Organization of the United Nations - FAO. (2020). Retrieved in 2020, September 14, from http://www.fao.org/faostat/en/#data/QC/visualize http://www.fao.org/faostat/en/#data/QC/v... ), it is crucial to ensure its sustainable development. In particular, agriculture, farming, forestry, and aquaculture industries, which provide renewable resources, are essential for the development of a circular bioeconomy (D’Amato et al., 2020 D’Amato, D., Veijonaho, S., & Toppinen, A. (2020). Towards sustainability? Forest-based circular bioeconomy business models in Finnish SMEs. Forest Policy and Economics, 110, 101848. http://dx.doi.org/10.1016/j.forpol.2018.12.004. http://dx.doi.org/10.1016/j.forpol.2018.... ) and are a good starting point for the implementation of sustainable and circular practices.

Understanding biaxial deformation is essential for a more realistic evaluation of rubber elasticity compared to the more usual uniaxial deformation. To study crystallisation occurring during biaxial deformation of natural rubber films, a new simple equipment has been designed and assembled. The equipment, mounted in the beamline of ALBA synchrotron light source facility, allowed the in-situ measurement of X-ray scattering of natural rubber during biaxial deformation. This work provides, for the first time, quantitative information on crystallisation during biaxial extension.