Group 1: Event Overview - The 12th World Games opened in Chengdu, Sichuan, with over 5,000 athletes from more than 100 countries competing in 35 major sports and over 250 minor events, showcasing the event as an "innovation laboratory" for niche sports and related chemical new materials [1] Group 2: Nanomaterials for Cooling Solutions - Sichuan Tianfu Xinglong Lake Laboratory showcased cooling vests and hats designed for staff and volunteers, utilizing nanomaterials to reduce heat absorption and enhance radiation heat dissipation, maintaining a cooler environment [2] - The cooling vest's fabric features a radiation cooling material with a surface filled with nanostructures that filter out infrared rays, achieving a temperature difference of up to 8°C compared to conventional materials [2] - The radiation cooling material, manufactured by China Architecture Southwest Design and Research Institute, has a solar reflectance exceeding 98.6% and an infrared radiation rate over 99%, representing the highest performance level reported globally for similar products [2] Group 3: 3D Printing in Sports Equipment - 3D printing technology is utilized for custom sports equipment in niche events, such as freestyle diving, allowing for personalized fins tailored to athletes' specific foot dimensions and performance needs [3] - High-end freestyle diving fins are made from 100% aerospace-grade carbon fiber, enabling customization of size and stiffness to enhance performance through resonance principles [3] - Advanced roller skates are also produced using 3D printing, incorporating carbon fiber composites and thermoplastic polyurethane (TPU) for improved strength, weight reduction, and shock absorption [3] Group 4: Plastic Materials in Sports Facilities - Soft hockey, also known as dry land hockey, increasingly utilizes polypropylene (PP) plastic for its flooring, equipment, and barriers, promoting recyclability and resource sustainability [4] - The use of PP materials ensures safety and cost-effectiveness in event preparation, with properties such as impact resistance and UV stability extending the lifespan of the equipment [4] - For speed skating, acrylic materials are preferred for flooring due to their durability and slip resistance, enhancing athlete performance and safety during competitions [4]