Study The Properties On PA6/UHMWPE Blends

In this paper, it was focused on studying the blending and modification of polyamide 6 (PA6) with ultrahigh molecular weight polyethylene (UHMWPE) and high density polyethylene(HDPE). Because of some disadvantages which limited its application in many fields, PA6 should be modified. For it had some excellent all-round properties, UHMWPE was used to enhance some properties of PA6, such as low-temperature impact resistance and moisture absorption resistance in this paper.Maleated HDPE (HDPE-g-MAH) was prepared by solution method successfully. In order to get the adequate technical conditions, the influences of some factors on the grafting-ratio, such as amount of monomer and initiator, reaction-temperature, reaction-time and co-monomer were investigated respectively. Then PA6/PE blending alloys were prepared by mixing with HDPE-g-MAH as compatilizer, which had different grafting-ratio, and their properties were tested. The results showed that the use of HDPE-g-MAH with 1.0% grafting-ratio, the blending alloy achieved optimum properties. Addition of HDPE-g-MAH prepared by melting reaction, the properties of blending alloy had a little bit inferior to that use of it prepared by solution method. Considering the economy, the 1.0% grafting-ratio of HDPE-g-MAH prepared by melting reaction was used in this paper.UHMWPE was pre-treated with HDPE, it was investigated in this paper that the effect of the ratio of UHMWPE/HDPE on the properties of PA6/PE blends. The results showed that HDPE(6098) was adequate to improve the UHMWPE processing property and the optimal ratio by weight of UHMWPE/HDPE was 40/60(shortened form PE2 in this paper).The effect of the blend ratio of PA6/PE on properties of blending alloy was investigated in this paper. The optimal integrative performance was obtained with composition ratio from 80/20 to 70/30. The conclusions were proved ulteriorly by studying the phase morphology and the interfacial tension of the blends by means of Molau, Infrared Spectra(IR) and Scanning Electronic Microscope(SEM).The compatibility of HDPE-g-MAH to PA6/PE blending alloy was investigated systemically by adding different dosage of HDPE-g-MAH in this paper. The compatibility and interface binding between the PA6 and PE were improved greatest when 8-16 share of HDPE-g-MAH by weight was used. The conclusions were proved ulteriorly by studying the dispersal of PE in PA phaseand the two phase interface binding by means of Molau, Infrared Spectra(IR) and Scanning Electronic Microscope(SEM).The crystallization property of PA6/PE(80/20) blending alloy was investigated by Differential Scanning Calormetry(DSC). Without the HDPE-g-MAH, there was no virtual effect on the melting points and crystallinity of PE and PA phase respectively. It was found that the crystallization degree and the enthalpy of the PE phase were increased with increasing the dosage of HDPE-g-MAH, on the contrary, that of PA6 were decreased.The PA6/PE blending alloys were prepared in twin screw extruder by a melt mixing process, the effects of L/D ratio on the blends' property were investigated. It was found that larger L/D ratio was propitious to the compatibility between HDPE-g-MAH and PA6 during processing. The dispersal of UHMWPE in PA6 phase and interfacial adhesion between their phases was enhanced. Consequently, the mechanical properties of blends were improved apparently.Finally, HDPE-g-GMA was prepared by melting reaction method, the influences of different factors on the grafting-ratio, such as amount of monomer and initiator, reaction-temperature and reaction-time were investigated respectively. Then PA6/PE blending alloys were prepared by use of HDPE-g-GMA with different grafting-ratio. The results indicated that adding HDPE-g- GMA with 1.58% grafting-ratio, the blending alloy achieved optimum properties. The conclusions were proved ulteriorly by studying the dispersal of PE in PA phase and the two phase interface binding by means of Molau, Infrared Spectra(IR) and Scanning Electronic Microscope(SEM).