Material Drying
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Polyamic acid（PAA）solution viscosity control
Fenómeno do problema
PAA solution viscosity is too high or too low to be processed normally by casting or coating
Análise das causas
Improper control of polycondensation reaction degree (monomer ratio, reaction temperature and time); solvent water content affects the degree of polymerization
Solução
Strictly control the equimolar ratio of dianhydride and diamine; control the reaction temperature at -5~10°C (low-temperature solution polycondensation); use dry solvent
Conclusão principal
The molecular weight and viscosity of PAA are the primary control parameters for PI processing
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