The Preparation Of Antibacterial PA6/CS-NPs Hybrid Nanofiber Filaments Via A Onc-step Method And The Morphologies And Properties

With the wide-ranging research and rapid development,the preparation of the functional fibers has become a hotspot in the field of material science and technology.A new method was introduced to prepare the functional nanofiber filaments combining electrospinning and other post-treatment methods in this paper.PA6/CS-NPs hybrid nanofiber filaments would be fabricated by a homemade twelve-needle electrospinning method with a liquid bath circulating system by one-step.PA6/CS-NPs hybrid nanofiber filaments have the potential to be applied in the fields such as surgical gowns,medical gauze,underwear,and sportswear.To improve the dispersibility of the suspension and reduce particle aggregation,different dispersants would be introduced.And the effects of dispersants on the bath solution properties and the spinnability of the nanofiber filaments were discussed.Then by varying the mass ratios of 0.2 wt.%Span-80/Tween-80(S-80/T-80)in the bath solution,water flow rate,and the winding rate,the filaments with different properties could be prepared and morphologies and mechanical properties of nanofiber filaments would be obtained.The antibacterial activity testing and wash resistance were evaluated.Finally,by optimizing the preparation of the water bath and the bath device,the dispersibility of the suspension would improve and the number of CS-NPs deposited on the water bath would reduce.The effects of the water flow rate on the morphologies and mechanical properties of nanofiber filaments were studied and the antibacterial activity testing was evaluated.The main results were showed as below:(1)When S-80/T-80 was added to the bath solution,compared to the MC and PAAS,the suspension was stable and the distribution of the CS-NPs was relatively narrow.And the spinning system was stable and continuous spinning time was longer than the others.(2)The surface of the nanofibers could adsorb the largest number of nanoparticles The optimum solution composition was that the CS-NPs content was 0.4 wt.%and the S-80/T-80 concentration was 0.2 wt.%.The mechanical property of the hybrid nanofiber filaments was distinctly weakened compared to the pure PA6 nanofiber filaments.The breaking tenacity was 0.65 cN/dtex dropped by 40.37%.And initial modulus was 5.64 cN/dtex dropped by 36.56%.(3)In S3T7,the particle size of CS-NPs in bath solution was smallest and the maximum number of CS-NPs would be adhered on the surface of the fibers.In addition,the breaking tenacity was only 0.56 cN/dtex.As the water flow rate increased,the number of the CS-NPs adhered on the fibers surface rose synchronously.The fiber diameter of nanofiber filaments integrally had the downward trend.At the roller rate of 50,40,and 30 r/min,a considerable number of CS-NPs could be adhered on the surface of the fibers.The roller rate hadn’t distinct impact on the fiber diameter.Considering the fact of the CS-NPs adsorbance,fiber diameter,mechanical properties,the optimum spinning paraments was the S3T7 mass ratios of dispersant,20 ml/min water flow rate,and 40 r/min winding rate.(4)The antibacterial efficiencies of the PA6/CS-NPs hybrid nanofibers against E.coli and S.aureus were 99.9%,and 98.9%respectively.The antibacterial efficiencies would decrease after washing 5 min compared to the nanofibers not treated,for dropped by 9.44%against E.coli,and 2.89%against S.aureus.The antibacterial efficiencies of the nanofibers against E.coli and S.aureus were 98.9%,and 99.2%respectively after washing 5 min for 10 times.(5)When the suspension was treated with the grinder,the particle size of CS-NPs was smaller and the dispersibility of the suspension was more stable than before.The holes in the dam-board 4 overlapping with the water inlets were blocked,of which the proportion was 35.7%.When the dam-board 4 was put into the bath,the flow water became more stable and the number of CS-NPs deposited on the water bath would decrease.With the increasement of the flow water rate,the number of CS-NPs adhered on the surface of fibers would increase as well after optimizing the preparation of the water bath.When the flow water rate was 20 ml/min,the breaking tenacity and the initial modulus reached the maximum,which increased by 16.67%,and 60.62%compared to the un-improved spinning method.In addition,the antibacterial efficiencies of the nanofibers against E.coli and S.aureus were 99.56%,and 98.26%respectively.