Material Drying
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Polyamic acid（PAA）solution viscosity control
Problem Phenomenon
PAA solution viscosity is too high or too low to be processed normally by casting or coating
Cause Analysis
Improper control of polycondensation reaction degree (monomer ratio, reaction temperature and time); solvent water content affects the degree of polymerization
Solution
Strictly control the equimolar ratio of dianhydride and diamine; control the reaction temperature at -5~10°C (low-temperature solution polycondensation); use dry solvent
Key Takeaway
The molecular weight and viscosity of PAA are the primary control parameters for PI processing
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