Preparation Of Functional Engineering Plastics Masterbatches By Pickering Emulsion Templating Method And Properties Research

With the advancement of technology,there is an increasing demand for lightweight conductive materials.Conductive polymer composites have significant advantages over metals in terms of corrosion resistance and ease of processing.However,conductive polymer composites produced using conventional processing methods usually have a high filler addition when transforming from insulator to conductor,i.e.a high percolation threshold,and the nanoconductive fillers can agglomerate in the polymer matrix,resulting in poor mechanical properties and higher production costs.Therefore,lowering the percolation threshold of composites and reducing production costs has attracted the attention of researchers in recent years.In this paper,a two-step dispersion method combining Pickering's emulsion templating method and masterbatch blending method is proposed to prepare conductive polymer composites using carbon black(CB)and carbon nanotubes(CNT)as conductive fillers dispersed in acrylonitrilebutadiene-styrene(ABS)plastics respectively.The main findings are as follows.Aqueous phase dispersed with carbon black and oil phase dissolved with ABS plastic and CTAB were prepared as Pickering emulsion by homogenization in the ratio of 2:1 by volume,and then the masterbatch was obtained by natural drying and then melt blended with ABS in various mass ratios to prepare ABS/CB conductive composites.The addition of carbon black to ABS enhanced the tensile strength and Young's modulus of the composites,but reduced the elongation at break of the composites.The conductivity of the composites also increased with the addition of CB,with a conductivity of 7.12 S/m at 28.00 wt% and a percolation threshold of4.0 wt% for the composites.CTAB,as a cationic surfactant,has adverse effects on human health,whereas regenerated cellulose is a better biocompatible emulsifier prepared on the basis of cellulose regeneration,and also has a better emulsification effect compared to CTAB,so regenerated cellulose was used as an emulsifier to prepare the composites.Aqueous phases dispersed with CNT and regenerated cellulose were homogenised with an oil phase dissolved in ABS plastic at a volume ratio of 2:1to form a Pickering emulsion,which was then naturally dried to obtain masterbatches and blended with ABS in various mass ratios to form ABS/CNT conductive composites.The addition of CNT to ABS enhanced the tensile strength and Young's modulus of the composites,but reduced the elongation at break of the composites.The electrical conductivity of the composites also increased with the addition of carbon nanotubes and was 14.68 S/m at 5.60 wt% CNT.The percolation threshold of the composites was 0.73 wt%.