Abstract
Above a percolation threshold a flow restriction has to be overcome by higher pressure in plastic processing. Besides amount and geometry of fillers, the interactions of polymer and filler are important. By differing the amorphous phase of polymers into a rigid amorphous and a mobile amorphous fraction, predictions about interactions are possible. The objective is the generation of a flow restriction and the combined investigation of polymer–particle interaction. SiO2 was used up to 50 vol.% in different spherical sizes in PLA and PP. A capillary-rheometer was used as a tool to create a yield point and by that investigations into the state of the flow restriction were possible. All produced compounds showed, in plate-plate rheometry, an increase in viscosity for lower shear rates and a significant change in the storage modulus. In DSC, hardly any specific rigid amorphous fraction was detectable, which suggests that there is a minor interaction between macromolecules and filler. This leads to the conclusion that the change in flow behavior is mainly caused by a direct interaction between the particles, even though they are theoretically too far away from each other. First images in the state of the yield point show a displacement of the particles against each other.
Highlights
Every material melts at least once during processing, which is why the properties of the plastic melt play a decisive role
Above a percolation threshold a flow restriction has to be overcome by higher pressure in plastic processing
A capillary-rheometer was used as a tool to create a yield point and by that investigations into the state of the flow restriction were possible
Summary
Every material melts at least once during processing, which is why the properties of the plastic melt play a decisive role. Due to the fact that particles may rub against each other, an internal structure may form in the plastic because of the high filler content [4] This Polymers 2021, 13, x FOR PEER REVIEW can be understood as an increase in the flow resistance [5,6,7], which can be s2eeofn1i5n the increase of the storage modulus, especially for lower shear rates. Agglomerates can form and influence the flow behavior, as can be caused by the affinity between the polymer and the particles This is the content of countless studies in the literature based on the use of rheometry. It should be noted that the present manuscript is not a method for the quantitative determination of the bonding of the polymer chains to the additive, but a qualitative statement
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