Thermal Degradation of Phosphate and Phosphite-Linked Epoxy Resins Cured by Acid Anhydride

1 Thermal Degradation of Phosphate and Phosphite-Linked Epoxy Resins Cured by Acid Anhydride 

2 Comparison of Structure and Thermal Degradation of Phosphate-Linked Epoxy Resins between Anhydride and Cationic Curing Methods 

As thermosetting materials, epoxy resins can be cured either by anhydride through the condensation reaction mechanism using amine as the catalyst or by cationic 

Relative to the anhydride curing at 190°C, the cationic curing of phosphate-linked Epo-Pl and Epo-P2 can be achieved at a much lower temperature (130°C) using shorter time, which is favorable for the electronic and LED encapsulation process. Moreover, the curing temperature ranges for cationic systems are quite narrow. For example, Epo-Pl and Epo-P2 do not display any reaction exotherm below 120°C but are able to rapid cure at ca. 130°C, exhibiting both excellent latent properties and rapid curing characteristics. 

Sample Curing method T g-DMA (°C) Storage Modulus (10 Pa) P (mmol/cm ) 

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