Last date for submission of paper: unknown; Contact person: Pierre Verge; The 4th International Symposium on Polybenzoxazines ISPBZ 2020 will take place in Luxembourg on 23-25 September 2020.The symposium will focus on polybenzoxazines, reporting on the most recent advances in our understanding of the common properties of benzoxazine, as well as the latest progresses towards their technological exploitation.Polybenzoxazines are an emerging family of polymers finding applications in high technology fields, thanks to their many outstanding properties compared to conventional phenolic resins, such as excellent heat and chemical resistance, flame retardancy, a low dielectric constant, good dynamic mechanical properties, and a relatively inexpensive cost. The field of applications of polybenzoxazines is in full expansion, for instance as components of self-healing systems due to supramolecular interactions. In the coming years this area of research, between fundamental and applied science, is expected to give additional insights into the properties of polybenzoxazines and to unveil unforeseen applications for these materials.In the past few decades, research on the polybenzoxazines has mostly been performed from the chemistry point of view. However, for this class of materials to be widely adopted in industrial applications, we need to appeal to a wider research community with particular emphasis on the materials point of view. ISPBZ 2020 is designed to inspire such researchers by making them aware of the new opportunities that were to now unobtainable with the existing traditional materials.The symposium is expected to act as a platform for the discussion of the main challenges, bringing together scientists, engineers and students, from an academic or industrial background, working on all aspects of polybenzoxazines, from fundamental physics and chemistry issues to their final application in functional devices.As part of the symposium, a special session will focus on sustainable polybenzoxazines, offering the possibility to discuss specific aspects related to the development of polybenzoxazines from renewable resources, the use of less hazardous chemicals and synthesis pathways in accordance with REACH legislations, as well as addressing the notions of recyclability in this field.