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A new type of proton exchange membrane for direct methanol fuel cells, featuring independent intellectual property rights, high stability in water, and good electrical conductivity at high temperatures, has been developed recently by the Changchun Institute of Applied Chemistry under the Chinese Academy of Sciences. It has passed the expert evaluation conducted by the Changchun Science and Technology Bureau. Direct methanol fuel cells are one of the most versatile proton exchange membrane fuel cells available today. Since their introduction, they have become a focus of research and development in the fields of energy and transportation both domestically and internationally, thanks to their advantages such as high energy conversion efficiency, low environmental impact, and ease of miniaturization. The proton exchange membrane is one of the key materials in the production of fuel cells, and it is also one of the main factors affecting the performance and cost of fuel cells. However, current challenges such as the mixed potential generated at the cathode due to methanol permeating through proton exchange membranes, and the high cost of perfluorinated proton exchange membranes, severely hinder the practical application and commercialization of direct methanol fuel cells. Therefore, developing new types of proton exchange membranes as soon as possible is of great significance for advancing the development of fuel cells. Aiming to develop new proton exchange membranes and provide strong material support for the advancement of fuel cells, the Changchun Institute of Applied Chemistry under the Chinese Academy of Sciences took on the project \"Research on Proton Exchange Membrane Materials for Fuel Cells\" as part of the city’s and institute’s collaborative program aimed at revitalizing the old industrial bases in Northeast China, at the end of 2005. After three years of hard work, they conducted in-depth research from a chemical fundamentals perspective on the synthesis of non-fluorinated systems for new proton exchange membranes. They designed and prepared a \"sulfonated polyimide proton exchange membrane based on binaphthyl dicarboxylic anhydride\", a \"sulfonated polyimide proton exchange membrane based on diamines containing naphthyl groups\", and a new \"composite proton exchange membrane based on low-cost polyvinyl alcohol\". They also summarized the relationship between the structure and properties of proton exchange membranes, laying an important theoretical foundation for the development of high-performance, low-cost proton exchange membranes. Tests have shown that this non-fluorinated proton exchange membrane possesses high stability to water and good electrical conductivity at high temperatures, providing a solid foundation for the development of new fuel cells. http://www.16ds.com/papers/49/topics/6149