Mechanism Of Interfacial Enhancement And Functional Improvement Of Bamboo Plastic Composites Based On Biomimetic Chemistry Of Mussels

Bamboo plastic composite is considered a green material that can replace traditional petroleum-based products.However,the poor interfacial compatibility between bamboo fiber and polybutylene succinate（PBS）restricts the extensive application and development of bamboo plastic composites.To strengthen the poor fiber/PBS interfacial compatibility,bamboo fiber was chemically modified by polydopamine（PDA）,a chemical modifier of biomimetic mussel,inspired by the mussel byssus secretes proteins.The bamboo fiber/PBS composites were prepared using a hot press molding process.The chemical reactivity of the PDA molecule was used to induce the secondary reaction to further strengthen the interface binding between bamboo fiber and PBS matrix.By introducing functional components through secondary reaction,the composite can be endowed with special functions and its application range can be expanded.The main findings are as follows:（1）PDA molecules can deposit on the surface of bamboo fiber by hydrogen bonding without affecting the crystal structure in the cellulose chain,with the coating of PDA on the fiber surface,the color,surface roughness,and wettability of the bamboo fiber changed obviously.（2）The PDA-modification effectively improved the interfacial bonding between bamboo fiber and PBS matrix,when the concentration of dopamine aqueous solution was 2.00 mg/m L,the mechanical properties,dynamic mechanical properties,and interface adhesion of bamboo plastic composites were the best,and water absorption and moisture absorption have been greatly improved.（3）The PDA/KH550-modification further enhanced the interfacial interaction between bamboo fiber and PBS matrix,when the concentration of KH550 aqueous solution was 0.40 mg/m L,the mechanical properties,dynamic mechanical properties,and interface adhesion of bamboo plastic composites were the best,and water absorption and moisture absorption have been greatly improved,which is better than the materials modified by PDA and KH550.（4）The PDA/octadecylamine-modification further improved the interfacial compatibility between bamboo fibers and the PBS matrix,when the concentration of octadecylamine ethanol solution was 10.00mmol/L,the mechanical properties,dynamic mechanical properties,and interface adhesion of the composites were the best,and water absorption and moisture absorption have been greatly improved,which is better than the materials modified by PDA.（5）The excellent reducibility of PDA molecules can introduce Ag NPs on the fiber surface,which can impart antibacterial activity to the as-prepared bamboo fiber/PBS composites,when the silver ion concentration reached 0.08 mol/L,the mechanical properties,dynamic mechanical properties,and interface adhesion of the composites were the best,the as-prepared composites showed excellent antibacterial properties to Gram-negative and Gram-positive bacteria.（6）To prepare electromagnetic shielding bamboo fiber/PBS composites,Fe₃O₄-NPs can be introduced on the surface of bamboo fibers through chelation reaction,and polypyrrole coating can be deposited on the fibers through a meteorological deposition,when the concentration of ferrous chloride solution tetrahydrate is 0.40 mol/L,the concentration of ferric chloride solution hexahydrate is 1.08 mol/L,the mechanical properties,dynamic mechanical properties,and interface adhesion of the composites were the best,the as-prepared composites showed ideal electromagnetic shielding efficiency.