In recent years, there has been much research into the development, product design, and manufacture of sustainable materials, and polymer materials are among the most promising. Polymer materials and technologies are in high demand across a variety of sectors, including aerospace, defense, mobile technology, medicine, and Internet of Things instruments, but in particular for the electronics industry. The development of polymer devices has been ongoing for many years, for both synthetic and organic polymer materials, and their significance is based on their inherent material properties. These properties enable their use as electrical insulators, adhesives, sealing materials, and surface barriers for commercial electronic kits. The versatility of these polymer materials also helps to lower the cost of manufacturing.

New developments in polymer materials have been applied successfully in many disciplines. Descriptive patterns in printed circuit boards, followed by coating, is a traditional technique used to increase the reliability of electronic kits. Block copolymers (BCPs) exhibit interest properties when interacting with applied electric fields (AEFs), and while the BCPs need not be electrochemically active or polar, the effects of AEFs are only observed in polymers smaller than tens of micrometers in length. The replacement of the electronic substrate in plastic laminated circuit boards has reduced complexity and increased reliability. Further exploration into metamorphosed polymers and their biodegradability is of potentially great significance, as are advances in the development of organic polymers as functional materials for thin films and photovoltaic cells. These changes in photonic devices from conventional polymers to conjugated or organic polymers are due to the high optical absorption and optoelectronic properties of the polymers. The current demand for polymer composites can be met through advanced manufacturing process such as additive manufacturing, fused bed methods, or digital light processing and expansion applied to polymer-based source materials. It is also important to consider green polymers and the environmental impact of polymers and their manufacture.

The aim of this Special Issue is to support innovation in the design and development of polymer composites for electronic substrate materials, and to create a platform for recent developments in polymer materials and their application to electronics. We welcome both original research and review articles.

Potential topics include but are not limited to the following:

• Architected polymer composites using 3D/4D printing
• Functionally graded polymer composites for electronic substrates
• Influence of shape memory behavior in polymer composites
• Development of high heat transferable polymer composites
• Role of conductive polymers in electronic substrates
• Development of biodegradable substrates for electronic industries
• Research on polymer composites for wearable electronic devices
• Research on natural polymers and bio-composites for electronic applications