Natural rubber(NR)latex is a renewable colloidal dispersion used in medical gloves,coatings,and flexible products.It is known for its excellent elasticity and film-forming ability but is limited by insufficient mechan...Natural rubber(NR)latex is a renewable colloidal dispersion used in medical gloves,coatings,and flexible products.It is known for its excellent elasticity and film-forming ability but is limited by insufficient mechanical robustness and chemical resistance.Incorporating nanofillers,such as graphene oxide(GO),is an effective approach to enhance its performance;however,achieving strong interfacial compatibility between hydrophilic GO and the nonpolar rubber matrix remains challenging.To overcome this issue,a multifunctional interfacial design inspired by mussel adhesion chemistry was developed to construct a hierarchical and cohesive GO network within the NR latex matrix.A tannic acid-based modifier(TM)bearing catechol and thiol groups was synthesized and anchored onto latex particles via hydrogen bonding with surface proteins and phospholipids,enabling subsequentπ-πinteractions and hydrogen bonding with GO nanosheets.This guided the selective self-assembly of GO into a continuous segregated network along the latex particle boundaries.Hierarchical interface reinforcement was achieved through Eu^(3+)ligand coordination.The incorporation of GO and enhancement of interfacial interactions promoted strain-induced crystallization,resulting in increased crystallinity and improved load transfer.The resulting composite film containing 0.5 part per hundred rubber GO and the bioinspired interface exhibited a tensile strength that was 107.8%higher than that of the pure NR latex film,while maintaining an elongation at break of 915%.Tear strength increased by 118.5%,toughness reached 61.7 MJ/m~3,nitrogen permeability decreased by 20.1%,and antibacterial efficiency against both Escherichia coli and Staphylococcus aureus reached 99.9%.The films also exhibited enhanced resistance to organic solvents,acids,and alkalis.This study provides a green and scalable strategy for fabricating high-performance NR latex-based products suitable for medical,protective,and engineering applications.展开更多
基金supported by the National Natural Science Foundation of China(No.52303063)。
文摘Natural rubber(NR)latex is a renewable colloidal dispersion used in medical gloves,coatings,and flexible products.It is known for its excellent elasticity and film-forming ability but is limited by insufficient mechanical robustness and chemical resistance.Incorporating nanofillers,such as graphene oxide(GO),is an effective approach to enhance its performance;however,achieving strong interfacial compatibility between hydrophilic GO and the nonpolar rubber matrix remains challenging.To overcome this issue,a multifunctional interfacial design inspired by mussel adhesion chemistry was developed to construct a hierarchical and cohesive GO network within the NR latex matrix.A tannic acid-based modifier(TM)bearing catechol and thiol groups was synthesized and anchored onto latex particles via hydrogen bonding with surface proteins and phospholipids,enabling subsequentπ-πinteractions and hydrogen bonding with GO nanosheets.This guided the selective self-assembly of GO into a continuous segregated network along the latex particle boundaries.Hierarchical interface reinforcement was achieved through Eu^(3+)ligand coordination.The incorporation of GO and enhancement of interfacial interactions promoted strain-induced crystallization,resulting in increased crystallinity and improved load transfer.The resulting composite film containing 0.5 part per hundred rubber GO and the bioinspired interface exhibited a tensile strength that was 107.8%higher than that of the pure NR latex film,while maintaining an elongation at break of 915%.Tear strength increased by 118.5%,toughness reached 61.7 MJ/m~3,nitrogen permeability decreased by 20.1%,and antibacterial efficiency against both Escherichia coli and Staphylococcus aureus reached 99.9%.The films also exhibited enhanced resistance to organic solvents,acids,and alkalis.This study provides a green and scalable strategy for fabricating high-performance NR latex-based products suitable for medical,protective,and engineering applications.
