Engineering polyamide 6(PA6)is preferred for its superior mechanical properties,yet the intrinsic flammability restricts its industrial applications.As one of the biomass phosphorus-containing chemicals,phytic acid(PA...Engineering polyamide 6(PA6)is preferred for its superior mechanical properties,yet the intrinsic flammability restricts its industrial applications.As one of the biomass phosphorus-containing chemicals,phytic acid(PA)is favorable for its high phosphorus content and aggregation ability,making it expected to enhance the fire retardancy of PA6.Herein,a melamine-phytate aggregate(MPA)is prepared by electrostatic interaction in aqueous solution,and applied as a synergist for aluminum diethylphosphinate(ADP)in PA6.The strong synergistic effect exists between ADP and MPA towards PA6,especially when their mass ratio is 3:1 and the total loading is 18 wt%.Compared to the neat PA6,this formula allows for remarkable decreases in peak heat release rate(PHRR),total heat release(THR),and maximum average heat release rate(MARHE)by∼48%,∼27%,and∼30%,respectively,as well as a high synergistic efficiency of∼43%in PHRR.This PA6 composite also presents a V-0 rating in the vertical burning(UL-94)test and a high limiting oxygen index(LOI)of 29.7%.This work offers an eco-friendly strategy for developing bio-based P/N fire-retardant aggregates for fabricating PA6 materials with high fire safety.展开更多
The antibacterial polyamide 6(PA6)material has attracted great research interest due to its wide ap-plication in food packaging,biomedical fields,functional textiles,and other fields.However,it is still a challenge to...The antibacterial polyamide 6(PA6)material has attracted great research interest due to its wide ap-plication in food packaging,biomedical fields,functional textiles,and other fields.However,it is still a challenge to prepare intrinsically antibacterial PA6 with highly efficient and durably antibacterial activity via polymerization.Herein,the antibacterial imidazolium ionic liquid of 3-carboxymethyl-1-decyl imida-zole chloride was designed and synthesized for adapting the polymerization and processing temperature of PA6.Then antibacterial PA6(PA6-IL)was synthesized through hydrolyzed ring-opening copolymeriza-tion with imidazolium at the end of the backbones.Compared to physical blending or post-modification methods,antibacterial agents as end-capping reagents of polymer backbones endowed PA6 with intrin-sic antibacterial activity.As expected,the obtained PA6-IL exhibited not just comparable physicochemical and mechanical properties to conventional PA6 but excellent antibacterial activity of low antibacterial time to 60 min and durability for 28 days.Additionally,the corresponding electrospun PA6-IL nanofi-brous membranes showed homogenous morphology and remarkable hydrophilicity of 7.7° as well as the high-efficient antibacterial activity.Melt-spun PA6-IL microfibers revealed a smooth surface as well as enhanced tensile strength and increased breaking elongation compared to those of conventional PA6.The PA6-IL microfibers also behaved with excellent antibacterial efficiency and durability.Accordingly,this work provides a feasible and straightforward strategy to prepare durably and intrinsically antibacterial PA6 materials especially PA6 fibers,which can be widely applied in the textiles field.展开更多
基金supported by the Australian Research Council(Grant Nos.FT190100188,LP220100278,DP240102628,DP240102728).
文摘Engineering polyamide 6(PA6)is preferred for its superior mechanical properties,yet the intrinsic flammability restricts its industrial applications.As one of the biomass phosphorus-containing chemicals,phytic acid(PA)is favorable for its high phosphorus content and aggregation ability,making it expected to enhance the fire retardancy of PA6.Herein,a melamine-phytate aggregate(MPA)is prepared by electrostatic interaction in aqueous solution,and applied as a synergist for aluminum diethylphosphinate(ADP)in PA6.The strong synergistic effect exists between ADP and MPA towards PA6,especially when their mass ratio is 3:1 and the total loading is 18 wt%.Compared to the neat PA6,this formula allows for remarkable decreases in peak heat release rate(PHRR),total heat release(THR),and maximum average heat release rate(MARHE)by∼48%,∼27%,and∼30%,respectively,as well as a high synergistic efficiency of∼43%in PHRR.This PA6 composite also presents a V-0 rating in the vertical burning(UL-94)test and a high limiting oxygen index(LOI)of 29.7%.This work offers an eco-friendly strategy for developing bio-based P/N fire-retardant aggregates for fabricating PA6 materials with high fire safety.
基金National Natural Science Foundation of China(Grant No.52273060)Science and Technology Research Project of the Educational Commission of Hubei Province(Grant No.D20221703)provide financial support.
文摘The antibacterial polyamide 6(PA6)material has attracted great research interest due to its wide ap-plication in food packaging,biomedical fields,functional textiles,and other fields.However,it is still a challenge to prepare intrinsically antibacterial PA6 with highly efficient and durably antibacterial activity via polymerization.Herein,the antibacterial imidazolium ionic liquid of 3-carboxymethyl-1-decyl imida-zole chloride was designed and synthesized for adapting the polymerization and processing temperature of PA6.Then antibacterial PA6(PA6-IL)was synthesized through hydrolyzed ring-opening copolymeriza-tion with imidazolium at the end of the backbones.Compared to physical blending or post-modification methods,antibacterial agents as end-capping reagents of polymer backbones endowed PA6 with intrin-sic antibacterial activity.As expected,the obtained PA6-IL exhibited not just comparable physicochemical and mechanical properties to conventional PA6 but excellent antibacterial activity of low antibacterial time to 60 min and durability for 28 days.Additionally,the corresponding electrospun PA6-IL nanofi-brous membranes showed homogenous morphology and remarkable hydrophilicity of 7.7° as well as the high-efficient antibacterial activity.Melt-spun PA6-IL microfibers revealed a smooth surface as well as enhanced tensile strength and increased breaking elongation compared to those of conventional PA6.The PA6-IL microfibers also behaved with excellent antibacterial efficiency and durability.Accordingly,this work provides a feasible and straightforward strategy to prepare durably and intrinsically antibacterial PA6 materials especially PA6 fibers,which can be widely applied in the textiles field.
