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Is It Always Impossible To Prepare A Toughened PA6 With Excellent Properties? Is It Ignored?

1. Tensile strength

Although an equal amount of antioxidant was added to the primary process during the secondary extrusion process, the toughened PA6 material still experienced significant oxidation. The appearance of the toughened PA6 material obtained by the primary and secondary extrusion process is shown in Figure 2. As shown. As can be seen from Figure 2, the color of the toughened PA6 particles obtained during the secondary extrusion process is significantly darker than that of the primary extrusion process, indicating that the toughened PA6 material undergoes more oxidative degradation during the secondary extrusion process, and thus The toughened PA6 material obtained during extrusion has lower tensile strength.

2. tensile yield strength

The tensile yield strength is shown in Figure 1 at point 2 in the tensile curve of the toughened PA6 material. As can be seen from Table 1, the tensile yield strength of the toughened PA6 material obtained in the first extrusion process is 42.25 MPa. After the secondary extrusion process, the tensile yield strength of the toughened PA6 material slightly decreases to 41.47 MPa. Although the toughened PA6 material undergoes more oxidative degradation during the secondary extrusion process, the effect on the tensile yield strength of the toughened PA6 material is not significant, indicating that the tensile yield strength of the toughened PA6 material on the extrusion process and Oxidative degradation defects are not sensitive.

3. Elongation at break

From Table 1, it can be seen that the elongation at break of the toughened PA6 material obtained in the first extrusion process is 198.67%, but after the secondary extrusion process, the elongation at break of the toughened PA6 material significantly decreases to 152.73%. The decline rate reached 23%. This is due to the more oxidative degradation of the toughened PA6 material obtained during the secondary extrusion process, resulting in an increase of PA6 segment defects and a significant decrease in the elongation at break of the toughened PA6 material, indicating the elongation at break of the toughened PA6 material. The rate is very sensitive to the extrusion process and oxidative degradation defects.

4. Tensile breaking strength

The location of the fracture strength in the tensile curve of the toughened PA6 material is shown in Figure 1 at 3 o'clock. From Table 1, it can be seen that the toughness of the toughened PA6 material obtained in the first extrusion process is 48.18 MPa. After the secondary extrusion process, the fracture toughness of the toughened PA6 material is reduced to 40.78 MPa, which is related to the extrusion process. The effect of tensile strength on the toughened PA6 material is very similar, indicating that this property is very sensitive to the extrusion process and oxidative degradation defects.

5. Room temperature impact strength

From Table 1, it can be seen that the room temperature impact strength of the toughened PA6 material obtained in the first extrusion process is 99.53 kJ/m2. After the secondary extrusion process, the room temperature impact strength of the toughened PA6 material is reduced to 89.03 kJ/m2, which is declining. The rate reached 10%. This shows that the room temperature impact strength of the toughened PA6 material is very sensitive to the extrusion process and oxidative degradation defects, and a good antioxidant system is a good guarantee for the toughness of the toughened PA6 material.

6.-40°C impact strength

In order to satisfy toughened PA6 materials that maintain good impact resistance even at low temperatures, it is necessary to evaluate the impact strength of toughened PA6 materials at low temperatures (typically –40°C).

From Table 1, it can be seen that the extrusion process has no significant effect on the -40°C impact strength of the toughened PA6 material. This shows that toughened PA6 material -40 °C impact strength is not sensitive to the extrusion process and the oxidative degradation defects, which is very different from the impact of room temperature impact strength, but with the decline in temperature, toughening PA6 material impact strength is very obvious .


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