CN-122016565-A - Method and device for quantifying interfacial slippage of incompatible polymers

CN122016565ACN 122016565 ACN122016565 ACN 122016565ACN-122016565-A

Abstract

The invention relates to the field of high polymer material detection and discloses a method and a device for quantifying incompatible polymer interface slip, wherein the method comprises the steps of preparing a test sample, wherein the test sample comprises a plurality of polymers which are stacked together and mixed with tracer particles, setting test conditions so that each polymer in the test sample flows relatively, respectively acquiring coordinate positions of the tracer particles with a plurality of preset depths in each polymer at a plurality of moments through a detection device, calculating and acquiring the movement speed of the tracer particles with the preset depths based on the corresponding coordinate positions and the corresponding movement time, manufacturing a depth-movement speed graph based on the corresponding depths and the corresponding movement speeds of the tracer particles with different depths, and acquiring the interface slip speed of adjacent polymers based on the depth-movement speed graph. According to the invention, the sliding speed of adjacent polymers at the interface can be obtained by making curves of the movement speeds of the trace particles with different depths and then extrapolation.

Inventors

ZHU XIAOYI
HUANG BANG
ZHANG LI
HUANG YAJIANG
DONG LINAN
MENG XIAOWEI
XIE YANAN

Assignees

重庆市计量质量检测研究院

Dates

Publication Date: 20260512
Application Date: 20251127

Claims (10)

1. A method of quantifying incompatible polymer interface slip, the method comprising: preparing a test sample, wherein the test sample comprises a plurality of incompatible polymers which are stacked in sequence from bottom to top, and the surface and the inside of each polymer are uniformly mixed with trace particles; setting test conditions such that each polymer within the test sample produces a relative flow; Respectively acquiring coordinate positions of trace particles with a plurality of preset depths in each polymer at a plurality of moments through a detection device, and calculating and acquiring the movement speed of the trace particles with the preset depths based on the corresponding coordinate positions and the corresponding movement time; And based on the depth corresponding to the trace particles with a plurality of preset depths and the corresponding movement speed in each polymer, preparing a depth-movement speed diagram corresponding to each polymer, and obtaining the interface sliding speed of the adjacent incompatible polymers based on the depth-movement speed diagram corresponding to each polymer.
2. The method of claim 1, wherein the step of setting test conditions such that each polymer within the test sample produces a relative flow comprises: placing the test sample in a sample cell, wherein the sample cell comprises a stationary plate and a moving plate which are oppositely arranged, one of the polymers of the lowermost layer and the uppermost layer of the test sample is arranged on the stationary plate, and the other is arranged on the moving plate; heating the sample cell so that all of the polymer is in a molten state; a predetermined shear force is applied to the moving plate such that it rotates at a predetermined rate.
3. The method according to claim 1 or 2, wherein the step of obtaining the interfacial slip velocity of the adjacent polymer based on the depth-motion velocity map corresponding to the polymer comprises calculating the difference in the motion velocity at the interface of the adjacent polymer, which is the interfacial slip velocity, based on the depth-motion velocity map corresponding to the polymer.
4. The method of claim 2, wherein after heating to a temperature such that all of the polymer is molten, the distance between the stationary and moving plates is adjusted such that the thickness of the test sample does not exceed 90% of its initial thickness.
5. The method of claim 2 or 4, wherein the predetermined rotation rate is γ,0< γ≤5/s.
6. The method of claim 5, wherein the tracer particles are added in an amount of no more than 0.5wt.%, based on the total amount of polymer, the tracer particles having a diameter of between 1 and 5 um.
7. The method of claim 5, wherein the thickness of a monolayer of the polymer is no more than 0.8mm and the total thickness after stacking is no more than 3mm.
8. A method according to claim 3, wherein the difference between adjacent two of the plurality of preset depths within the same polymer is no more than 0.02 mm.
9. A device for quantifying interfacial slippage of an incompatible polymer according to any of claims 1-8, comprising a microscope, wherein a detection device is mounted on an eyepiece of the microscope, a shear heating stage is mounted on a stage of the microscope, a sample cell is mounted in the shear heating stage, the sample cell is mounted with the test sample, and a viewing aperture is provided in the shear heating stage, the viewing aperture being arranged such that the detection device obtains a coordinate position of a tracer particle in the test sample.
10. The device of claim 9, wherein the shear heating table comprises an upper cover and a lower cover which are oppositely arranged and can be heated, the upper cover is covered on the lower cover, the distance between the upper cover and the lower cover is adjustable, grooves are formed in the upper cover and the lower cover, the grooves in the upper cover and the lower cover are spliced into a sample groove in a butt joint mode, the sample tank is arranged in the sample groove, and the observation hole is formed in the upper cover.

Description

Method and device for quantifying interfacial slippage of incompatible polymers Technical Field The invention relates to the field of high polymer material detection, in particular to a method and a device for quantifying the interfacial slippage of an incompatible polymer. Background The polymer blend is a physical mixture formed by two or more than two homopolymers, copolymers with different molecular structures or the mixture of the homopolymers and the copolymers, the components of the polymer blend are connected without covalent bonds, and the polymer blend belongs to a heterogeneous system in the field of high polymers. The method can improve or endow special performance by mixing the components, has simple preparation process and wide component selection range, and can rapidly develop special performance materials. Because of the non-covalent bond connection between the components of the polymer blend, interfacial region molecular chain entanglement is reduced, which can lead to interfacial slippage during melt mixing, especially during processing, where the blend is in a flowing state, and the existence of interfacial slippage can significantly alter the dynamics of the incompatible phase interface. Many experimental and computational studies have shown that interfacial slippage promotes agglomeration of the dispersed phase, impedes deformation, and alters the fragmentation pattern of the dispersed phase, both in shear flow and in elongational flow. Interface slippage will cause adverse effects such as low interface stress transfer efficiency, weak interface adhesion, low blending efficiency, poor stability, poor blending physical properties, and the like. Macroscopically, flow-induced interfacial slip can result in an abnormally reduced apparent viscosity and stress of the blend under steady shear flow, which can be detrimental to the stability of the microscopic phase morphology of the material, resulting in reduced material properties. Therefore, the research on the interface slip degree is helpful to improve the processing efficiency and the product stability of the blend, and in the existing research, the method for quantitatively researching the interface slip of the incompatible polymer blend is less, and the interface slip condition is usually indirectly represented by adopting methods such as rheology, simulation and the like. These methods are complex to operate and do not intuitively reflect the interface slip velocity. Disclosure of Invention The invention aims to overcome the defects of the prior art, provides a method and a device for quantifying the interfacial slippage of an incompatible polymer, intuitively shows the compatibility between two polymers, and provides theoretical support for improving the processing efficiency and the unstable phase morphology of the incompatible polymer. To achieve the above object, a first aspect of the present invention provides a method for quantifying interfacial slippage of an incompatible polymer, wherein the method comprises: preparing a test sample, wherein the test sample comprises a plurality of incompatible polymers which are stacked in sequence from bottom to top, and the surface and the inside of each polymer are uniformly mixed with trace particles; setting test conditions such that each polymer within the test sample produces a relative flow; Respectively acquiring coordinate positions of trace particles with a plurality of preset depths in each polymer at a plurality of moments through a detection device, and calculating and acquiring the movement speed of the trace particles with the preset depths based on the corresponding coordinate positions and the corresponding movement time; And based on the depth corresponding to the trace particles with a plurality of preset depths and the corresponding movement speed in each polymer, preparing a depth-movement speed diagram corresponding to each polymer, and obtaining the interface sliding speed of the adjacent incompatible polymers based on the depth-movement speed diagram corresponding to each polymer. According to the invention, the tracer particles are added into the polymer, the movement speeds of the tracer particles with different depths are tested, and the sliding speeds at the interfaces of the adjacent polymers can be obtained by extrapolation according to the curves of the movement speeds of the tracer particles with different depths. The polymers to which the present invention is applicable are not particularly required as long as adjacent polymers are incompatible with each other and do not react. The invention has no requirement on the selection of the tracer particles and the detection device, the tracer particles which are commonly used in the field are generally in the micron level, the viscosity of the polymer body is not influenced, for example, the tracer particles can be silica micron particles, and the detection device can be a CCD camera. Preferably, the step of setting