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The dispersed phase particles and the surface distance

by:CSSSLD     2021-01-23
Alloy, the study on the system's composition, compatibility, mechanical properties and microstructure study a lot, most from the compatibility, system composition and the relationship between microstructure and mechanical properties of staff to study, but the process factors on the micro structure and properties of the alloy, or the change of process conditions and what kind of the change of the structure, performance of alloy, the report on this aspect are very few, in practical work, a lot of people is from experience to the injection molding processing technology conditions were determined.

in the alloy system, ratio of each composition changes produce a great impact on the performance of alloy. Mainly on the change of the system components can cause microscopic structure changes, such as the content of dispersed phase increases, the system will turn phase structure, the dispersed phase gradually to continuous transformation, the other is with the change of composition and mechanical properties of the alloy to the direction of continuous phase component, a third is due to changes in composition, and molecular also have a certain degree of change, this change will also cause some performance alloy, such as flow properties, thermal properties, optical properties change, so the specific requirement of alloy, it is important to choose the right components than.

for a specific system of blending, the dispersed phase of certain performance will produce great influence on the performance of alloy, such as processing liquid, water imbibition may have obvious change, but it can be said the main mechanical properties of alloy are basically close to the performance of continuous phase, the dosage of dispersed phase, the greater the alloy mechanical properties deviating from the continuous phase the original performance. So at certain alloy group, must be accordance with the requirements of alloy used for proper adjustment.

to change the amount of PA6 on alloy fluidity, mechanical properties, thermal properties are the influence of different level. With the increase of PA6 content in the alloy, alloy melting point to increase, this is due to the flow of PA6 performance better than ABS, with the increase of PA6, heat distortion temperature of the alloy is on the decline, is because of the low heat distortion temperature of the PA6, because PA6 is crystalline polymer, as PA6 content increased, the tensile strength increases.
the dispersed particle size and the size of the screw shear mixing effect and there is a close relationship between the degree of compatibility of two phases. In fact, since most are incompatible polymer blend system or part of a compatible system, at the same time, mixing process, the screw of the shear force is limited, so in the blending system of dispersed phase particle diameter can't be small. Along with the increase of the dispersed phase particle diameter, the impact strength of alloy. Distance between the surface of the dispersed phase particles increases, the impact strength drops.

is usually a better system for compatibility, the system performance between the various components of a certain complementary or home and sex, but for the most part compatible system, the complementarity is not very obvious. For a specific system of blending, the dispersed phase and continuous, the size of the viscosity ratio on the properties of alloy has great influence, the viscosity of the differences between the component size, affect the blending extrusion process, the morphology changes and the two components of melt flow rate of inconsistencies, thus affect the mechanical properties of the alloy.

at select group, the two components of viscosity is relatively close to good, at the same time should also consider the rheological properties of components. In polyolefin-g-mah/injection molding processing products of the joint strength when a very important indicator, there are many factors that affect alloy seam strength alloy components in compatibility, rheological properties of components such as internal factors, external factors are processing temperature, such as injection temperature, mold temperature and mold gate location, factors such as the thickness of products, one of the important influence to solve its internal factors.

the compatible mechanism of compatibilizer is not increased with the increase of the dosage of unlimited increase, therefore, the dosage of the compatilizer is not the more the better, the dosage of the compatibilizer for different system must be through the experiment to determine. In blending system, dispersed phase particle size, in some sense on the surface of the stand or fall of the compatibility of the dispersed phase and continuous phase. Dispersed phase particles, the smaller the distance, the smaller the particle surface showed that the compatibility of two phases, mechanical properties of the alloy is better.

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