Given the growing interest of the rubber industry in seeking alternatives that contribute to environmental sustainability, this work aims to present a study of the mechanical, thermal, and structural properties of natural rubber composites using tannin extracted from Acacia mearnsii as an antioxidant agent. Tannin is a natural and biodegradable product, rich in polyphenols and known for its antioxidant properties. The analyses assessed the effectiveness of incorporating tannins (0, 1, 1.5, and 2 parts per hundred rubber) into sulfur-crosslinked natural rubber composites using a binary accelerator system across three distinct vulcanization schemes: conventional, semi-efficient, and efficient. Initially, tannin characterization tests were conducted, revealing characteristic polyphenol bands of proanthocyanidin catechins, a high total phenolic content, and a substantial reduction in antioxidant activity. These findings highlight the significant antioxidant potential of tannins, particularly for industrial and biological applications. The analyses of the characteristics of natural rubber composites with tannin incorporation indicated that the type of vulcanization process directly affects the antioxidant action of the plant tannin, with the tannins being most effective in the efficient system due to the formation of monosulfidic and disulfidic bonds. Furthermore, the incorporation of tannin did not compromise the physical and chemical properties of the materials, highlighting it as a viable additive for the rubber industry.

The growing demand for clean energy has driven the expansion of photovoltaic solar energy, leading to an increase in the number of installed solar panels. However, the improper disposal of solar panels can result in negative environmental impacts. Therefore, the recycling of photovoltaic panels emerges as a critical alternative to mitigate these effects. This review article aims to present the currently available solar panel recycling techniques and discuss the challenges and future perspectives of this practice. The methodology was based on searches in the Scopus, Web of Science, and Google Scholar databases to identify relevant articles on solar panel recycling. The findings highlight the necessity of combining mechanical methods with chemical and physical processes to achieve high-quality recycled materials. Furthermore, the study emphasizes the importance of implementing public policies and raising societal awareness about the significance of solar panel recycling to make this practice more widespread and effective.

Project management assumes a pivotal role in the current context, where organizations face constant changes and complex challenges. This study is dedicated to examining the theme of "Sustainable and Innovative Project Management," with a particular focus on planning, risk management, and integration. The core of this research lies in thoroughly investigating how the effective integration of these components not only enables the achievement of projected goals but also fosters sustainability and drives innovation within organizational structures. In this scenario, project management transcends its traditional role, emerging as a fundamental catalyst for business success in a constantly evolving world. The study emphasizes the pressing need to incorporate sustainability and innovation from the early stages of planning while highlighting the critical contribution of risk management and integration to this process. By adopting this approach, organizations can not only achieve their specific objectives but also become agents of positive change, benefiting society and the environment while solidifying their position in the global market.