Construction of a rough surface in EPDM/CB composite through peroxide curing: A mechanism for optimizing physico‐mechanical properties in automotive paint‐compatible applications

Abstract

This study investigates the profound impact of vulcanization methods on ethylene–propylene–diene monomer (EPDM) composites, with a particular focus on elucidating significant findings and achievements. Exploring eight composites, including sulfur and peroxide‐cured variations, we conducted an in‐depth evaluation of the crucial physico‐mechanical properties of the composites. The study extends to encompass the effects of vulcanization on heat aging parameters, providing a comprehensive understanding of the materials' resilience. Utilizing thermogravimetric analysis, differential scanning calorimetry, and Fourier transform infrared spectroscopy, our research delves into the processes, revealing critical insights into the thermal behavior and composition of the composites. Paint compatibility, a pivotal aspect in automotive applications, was rigorously examined through four different test methods. Surface morphology, investigated through scanning electron microscopy and atomic force microscopy, yielded valuable findings on the role of vulcanization in shaping surface roughness and enhancing paint compatibility. Additionally, the quantitative measurement of surface energy using the sessile drop method provided a deeper understanding of the adhesion properties. The findings distinctly underscore the superiority of peroxide‐cured composites, marking a significant stride toward their potential to revolutionize automotive applications. This research not only contributes to the knowledge base but also sets a foundation for advancements in EPDM composite materials, positioning them as key players in driving innovation within the automotive industry.Highlights Developed a peroxide‐cured EPDM rubber composite with a rough surface. A rough surface is more paint‐compatible than a smooth surface. The roughness of peroxide‐cured EPDM is greater than that of sulfur‐cured one. Peroxide curing introduces more polar functional groups and cross‐links. Peroxide‐cured EPDM has higher thermal stability than sulfur‐cured EPDM.