It is my great pleasure to give a warm welcome to you for joining PC2025, which will be held at Hyatt Regency Changchun, China, on October 17-21, 2025.

International Symposium on Polymer Chemistry (PC) is a regular conference organized by the State Key Laboratory of Polymer Science and Technology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences every two years. It has become a platform for academic exchange for polymer scientists from all over the world. The previous eight symposia (Changchun 2004, Dalian 2006, Hefei 2008, Suzhou 2010, Changchun 2012, Shanghai 2014, Changchun 2016, Changchun 2018, and a suspension of 2020-2024) made great success. The 9^th International Symposium on Polymer Chemistry (PC2025) will cover frontier research and development in polymer science, including: 1. Polymer synthesis and sustainable polymer, 2. Optoelectronic and functional polymer, 3. Bio-related and biomedical polymer, 4. Polymer structure and properties, 5. Polymer technology and industry.

We warmly welcome polymer scientists, young scientists, and PhD students around the world to join us, and we believe that your participation will be a great contribution to the success of PC2025. The symposium consists of Plenary Lectures, Invited Lectures, Oral Lectures, and Poster Session.

We look forward to seeing you at PC2025 in Changchun on this October.

Sincerely yours,

Xuesi Chen

Chair of PC2025

State Key Laboratory of Polymer Science and Technology

Changchun Institute of Applied Chemistry, Chinese Academy of Sciences

Changchun 130022, P. R. China