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May 18, 2023
It is worth noting that when the amino group in cylinder a and cylinder a are directly connected with the silicon atom, the reaction with the epoxy resin is very slow, and almost no gel is formed.
Morphological structure and fracture toughness of tetramethylbisphenol diglycidyl cheese (TMBPDGE) modified by amino terminated polydimethylsiloxane (CATPDMS) with different molar mass. The results showed that the degree of pre reaction between ATPDMS and epoxy resin in molten state increased with the decrease of molar mass of ATPDMS; During pre reaction, ATP with low molar mass and high molar mass The mixed use of OMS can improve the compatibility between ATPDMS and epoxy resin, generating small and narrow distribution polysiloxane particles. The fracture toughness of TMBPDGE modified by AT900/AT3000 or AT900/AT3880 mixture is 15%~20% higher than that of pure epoxy resin.
A polysiloxane modified epoxy resin was prepared by reacting dimethyldiphenylsiloxane oligomer terminated with aminopropyl group with bisphenol A epoxy resin. With the increase of phenyl content in the copolymer, the solubility parameters of the soft segment organosilicon polymer increase, increasing the compatibility between resins and achieving good toughening effect. When the phenyl content is 10%~25%, the elongation at break of the copolymer resin increases with the increase of phenyl content; When the phenyl content reaches 50%, the elongation at break of the copolymer resin gradually decreases. At the same time, the study of the structural system morphology of the polymer shows that the degree of siloxane enrichment on the surface of the material does not change with the structural composition and content of the modifier.