Preparation and properties of carbon fiber reinforced lignin-based phenolic formaldehyde resin
Alkali-catalyzed phenolic modification was used to increase the content of reactive sites of lignin to replace phenol,which was used to prepare phenolic resin and carbon fiber reinforced lignin-based phenolic formaldehyde resin.The influence of conditions of alkali-catalyzed phenolic modification on the structure of lignin was investigated.The structure of lignin-based phenolic resins in different substitation ratio,the morphology and mechanical properties of carbon fiber reinforced phenolic resin were characterized.The results show that the active sites of lignin are increased significantly after alkali-catalyzed phenol modification.The optimal preparation process is as follows:the modification temperature is 90℃,the modification time is 90 min and the mass fraction of alkali is 4%.The structure of lignin based penolic resin is similar to that of traditional phenolic resins.The bending strength and interlaminar shear strength of carbon fiber reinforced lignin-based phenolic formaldehyde resin whose substitution rate of lignin is 30% are higher than those of traditional composites.
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