Preparation And Properties Of PE100/PA6 Blending Alloy

Bimodal polyethylene is a bimodal distribution of molecular weight polyethylene,low molecular weight part of which provides a good processing properties and high molecular weight part to provide good mechanical propert-ies.It is another new material after metallocene polyethylene.Bimodal polyet-hylene has higher strength,toughness and resistance to environmental than or-dinary polyethylene because of its unique structure.PE100 is a kind of bimodal polyethylene which develops fast those years and widely uses in the tubing.Its main feature is higer pressure resistance rank and the pipe wall is thinner under the same pressure.But its thermal stability is not good which limite its application.This paper modified PE100 with PA6,melt extrusion to prepare PE100/ PA6/HDPE-g-MAH(POE-g-MAH) blends,has studied the influence of temper-ature,the blending craft,the compatilizer type and the amount,different viscosi-ty PA6 and the amount systematically on the mechanical properties,the shape structure,thermally stable,the crystal behavior and the dynamic changing beha-vior.The experimental result indicated that:The processing temperature and the blending craft have little influence on the mechanical properties of blends;Tensile strength of PE100/PA6(100/7) blends has increased and then decreased with the increasing of the POE-g-MAH or HDPE-g-MAH content and it reaches the maximum when the content of POE-g-MAH or HDPE-g-MAH is 3%; Impact strength and elongation at break of PE100/PA6(100/7) blends have increased with the increasing of the POE-g-MAH content and have increased and then decreased with increasing of the HDPE-g-MA H,which reaches the highest point when the content of HDPE-g-MAH is 5%; Heat resistance of PE100/PA6(100/7) blends has increased and then decreased with increasing of the POE-g-MAH or HDPE-g-MAH and it reaches the maximum when the content of POE-g-MAH or HDPE-g-MAH is 3%; After joining POE-g-MAH or HDPE-g-MAH,the complex viscosity,the storage modulus,consume energy the module increase,the shear stress reduces; POE-g-MAH or HDPE-g-MAH all make particle size of PA6 in the PE100/PA6 blends smaller,particle size distribution becomes uniform and the interface becomes fuzzy.Comparison of the influence of POE-g-MAH or HDPE-g-MAH on the mechanical and morphology properties of the PE100/ PA6(100/7)blends,found that HDPE-g-MAH compatibilizer is better. With the content of PA6 increasing,tensile strength of PE100/PA6 blends has decreased and impact strength first increases and then decreases when the compatibilizer is HDPE-g-MAH;wide-angle X-ray diffraction(XRD) study shows that PA6 hinders the crystallization of PE100 and causes the crystallinity of PE100 to reduce; polarized light microscopy(PLM) indicate PA6 has the role of nucleating agent which the spherulite size decreases; scanning electron microscopy(SEM) find PA6 dispersed variation,particle size and uniformity variation when the content of PA6 is increasing.With the increasing of low viscosity PA6,Vicat softening point of PE100 /PA6/HDPE-g-MAH blends first increases and then decrease, which reaches the highest point when the content of low viscosity PA6 is 15%.It is higher than pure PE100 with 8.1℃.For high viscosity PA6,Vicat softening point of PE100/PA6/HDPE-g-MAH(100/30/15) blends reaches 140.8℃,higher than pure PE100 increased 13.2℃.