Preparation And Properties Of Nylon 1212/Functional Elastomer/Carbon Filler Ternary Composites

As a thermoplastic engineering plastic,nylon has been widely used in many fields because of its excellent electrical insulation,mechanical properties,solvent resistance and good processing characteristics.However,nylon has low toughness and poor antistatic properties at low temperatures,the addition of elastomers and conductive fillers can modify these disadvantages.The optimal formulation of polymer nanocomposites is often determined by orthogonal experimental methods.However,orthogonal experiments have the disadvantages of long research periods and high consumption.How to determine the optimal formulation of polymer nanocomposites through a quick and simple method is an important topic.In this article,nylon 1212/functionalized elastomer/carbon filler nanocomposites were prepared by melt blending method.The effects of the type and content of the functionalized elastomer,the type and content of the carbon filler on the rheological behavior,electrical conductivity and mechanical properties of the nanocomposite were examined.The main research results are as follows:(1)The effects of mSEBS and CB content on rheological behavior and mechanical properties of nylon 1212/mSEBS/CB composites were investigated.With the increase of mSEBS content,G? curves of nylon 1212/mSEBS/CB composites show “second plateau” in the low frequency regions,exhibiting a clear gelation transition.The gel points of composites with 0 wt%,5 wt%,and 10 wt% CB are 13.09 wt%,12.67 wt%,and 9.58 wt% mSEBS,respectively.The addition of mSEBS improves significantly the impact toughness of nylon 1212 and the addition of CB can keep high rigidity of nylon 1212 matrix.The notched impact strength of the composites corresponding to the gel point is about 7.7 times higher than that of pure nylon 1212,indicating that the mechanical properties and rheological properties of the nylon 1212/mSEBS/CB ternary composites have a certain correlation.(2)The effects of mPOE and MWCNTs content on rheological behavior,electrical conductivity and mechanical properties of nylon 1212/mPOE/MWCNTs composites were investigated.With the increase of MWCNTs content,G? curves of nylon1212/mPOE/MWCNTs ternary composites appear “second plateau” in the low frequency regions,exhibiting a clear gelation transition.When the content of mPOE is 0 wt%,3 wt% and 6 wt%,the gel points of nylon 1212/mPOE/MWCNTs ternary composites are 1.74 wt%,1.82 wt% and 1.74 wt% MWCNTs,respectively.The addition of mPOE and MWCNTs can improve significantly the impact toughness of nylon 1212.The notched impact strength of the composites corresponding to the gel points shows the maximum and the gel points are located in the conductive percolation zone.There are some relationships between mechanical properties and rheological behaviors.(3)The effects of mSEBS and MWCNTs content on rheological behavior,electrical conductivity and mechanical properties of nylon 1212/mSEBS/MWCNTs composites were investigated.When the content of MWCNTs is more than 2 wt%,G'curve of the composite with 5 wt% mSEBS shows a “second plateau” in the low frequency regions,exhibiting a clear gelation transition.All G? curves of the composites with 13.09 wt% mSEBS appear obvious “second plateau” in the low frequency regions and are sensitive to the MWCNTs concentration.The composites with 5 wt% m SEBS exhibit a gel point at 1.81 wt% MWCNTs content,while the composites with 13.09 wt% mSEBS show no gel point.The addition of mSEBS and MWCNTs can improve significantly the impact toughness of nylon 1212.The notched impact strength of the composites corresponding to the gel points shows the maximum and the gel points are located in the conductive percolation zone.There are some relationships between mechanical properties and rheological behaviors.