๐๐จ๐๐๐ฒ'๐ฌ ๐๐๐๐๐๐๐๐๐ ๐๐ก๐๐ซ๐ : ๐๐ก๐ฒ ๐๐จ๐๐ฌ ๐ญ๐ก๐ ๐๐ ๐จ๐ ๐๐๐๐ฒ๐๐ฅ๐๐ ๐๐๐ ๐๐๐ง๐ ๐ญ๐จ ๐๐๐๐ซ๐๐๐ฌ๐?
๐๐จ๐๐๐ฒ'๐ฌ ๐๐๐๐๐๐๐๐๐ ๐๐ก๐๐ซ๐ ♻️ ๐๐ก๐ฒ ๐๐จ๐๐ฌ ๐ญ๐ก๐ ๐๐ ๐จ๐ ๐๐๐๐ฒ๐๐ฅ๐๐ ๐๐๐ ๐๐๐ง๐ ๐ญ๐จ ๐๐๐๐ซ๐๐๐ฌ๐? Intrinsic Viscosity (IV) is one of the most critical parameters for PET performance. Yet in recycled PET (rPET), IV loss is a common and often misunderstood issue. So why does IV tend to decrease during recycling? 1.Thermal degradation during reprocessing: PET is sensitive to heat. During extrusion and re-melting, excessive temperature or long residence time can cause polymer chain scission, directly reducing molecular weight and therefore IV. 2.Hydrolysis caused by residual moisture: Even small amounts of moisture can trigger hydrolytic degradation at high processing temperatures. Without proper drying control, IV loss can occur rapidly and irreversibly. 3.Mechanical stress in multiple processing steps: Grinding, washing, extrusion, and filtration all introduce mechanical shear. Each step slightly shortens polymer chains, and the cumulative effe...