Preparation And Barrier Mechanism Of Intercalated Modified Montmorillonite/Cassava Starch Composite Film

Montmorillonite(MMT)is a layered silicate with three-layer structure.Due to its abundant natural reserves and low price,it has a significant effect on the barrier performance of polymers.Starch and other natural polymer forming composite material barrier performance are poor,the industrial production of the use of the range is greatly affected.Based on the natural montmorillonite,do decyl trim ethyl ammonium chloride(DTAC),do decyl dimethyl benzyl ammonium chloride(DDBAC)and octadecyl trim ethyl ammonium chloride(STAC)as raw material,the preparation of organic modified montmorillonite material,by scanning electron microscopy(sem)and transmission electron microscopy(sem),Infrared spectrum,X-ray diffraction(XRD)characterization analysis,and the organic montmorillonite and explore the performance of starch to form composite membrane materials,preparation of magnetic materials and through the way to explore the mechanism of montmorillonite combination and the connection between the molecular pathways.(1)Montmorillonite was prepared for natural montmorillonite suspension,and then intercalated with organic modifiers to form organic montmorillonite.As the ultrasonic time of montmorillonite increased,the distance between montmorillonite layers increased from 0.16 nm to 1.49 nm.The tga increased from 11.7% to 19.6%,which proved that the ultrasonic time was related to the intercalation reaction.With the increase in the addition amount of montmorillonite organic modifiers / a modifier / the modifier,the intercalation effect of montmorillonite and organic modifier also changed significantly.With the increase in the addition amount,the intercalation distance increased continuously,from 0.21 nm to 1.01 nm,and the weight loss rates / rated increased from 19.1% to 25.9%.The length of carbon chains also affects the interlayer distance.The longer the carbon chain is,the longer the interlayer distance between the supporting layers will be.The interlayer distance between / from functional groups can also be improved,with the interlayer distance increased to 1.25 nm,and the weight loss rate increased to 24.6%.(2)After the addition of organic montmorillonite,the starch film can visually observe the three-layer interlayer structure of montmorillonite.The film is even and even,with smooth surface and good appearance.Due to the introduction to montmorillonite,the transmittance of the composite film was reduced by 10% within the range of 600 nm light waves,and the introduction to montmorillonite had an obvious inhibition effect on ultraviolet ray,which was obviously shown at the light wave of 200 nm.(3)The thermal stability of the montmorillonite starch film did not change significantly.The decomposition temperature range of the composite film was 200-500?,and the weight loss rate was 80%.Although the introduction to hydroxyl into starch film into montmorillonite may reduce the hydroscopicity and hydrophobicity of montmorillonite,due to the organic modification of montmorillonite,the hydroscopicity and hydrophobicity of montmorillonite did not decrease,and the performance of montmorillonite did not decrease compared with that without montmorillonite.(4)The organic montmorillonite can successfully prepare the magnetic montmorillonite powder under magnetization.Compared with the montmorillonite powder without magnetization modification,the interlayer distance between / from the magnetic montmorillonite powder is increased from 0.14 nm to 1.49 nm.(5)The magnetized modified montmorillonite and magnetized modified organic montmorillonite starch films are not ideal in improving the moisture permeability of the films due to the strong water absorption performance of the starch in the starch films,and the water resistance of the films is slightly reduced due to the hydroxyl group of the montmorillonite itself.Magnetize modified montmorillonite and organic modified montmorillonite have obvious performances in oxygen resistance of montmorillonite starch films.The oxygen resistance of modified montmorillonite starch film was obviously improved.In the magnetic montmorillonite modified starch film,the effect is significant and the oxygen resistance is close to zero.Especially in ordered magnetic montmorillonite starch composite films,the effect is stable and the oxygen resistance is the best.