Macromolecule intralayer shear orientation measurement method based on interdigital electrode

Abstract

Belonging to the technical field of macromolecule orientation measurement, the invention in particular relates to a macromolecule intralayer shear orientation measurement method based on an interdigital electrode. The method includes the steps of: S1 clinging a pair of interdigital electrode probes to a to-be-measured material surface; S2 setting the interdigital electrode probing depth, and testing the capacitance signal values Cxlambda i and Cylambda I of the to-be-measured material at different depth positions; S3 constructuing a dielectric constant calculation parameter equation set respectively, and performing solution to obtain the dielectric constant values epsilon xlambda i and epsilon ylambda i in two directions of each thickness layer in the to-be-measured material; S4 calculating the orientation value delta epsilon lambda i=epsilon xlambda i-epsilon ylambda i of the to-be-measured material at each depth layer relative to a to-be-measured material coordinate system and the orientation direction theta lambda i shown as the specification, thus finishing macromolecule intralayer shear orientation measurement. The method provided by the invention has no need for slicing and sample making, avoids the interference of human factors on the final orientation measurement result during sample making, improves the measurement result accuracy, saves test time, reduces the test cost, and is particularly suitable for measurement of macromolecule intralayer shear orientation.

Description

technical field [0001] The invention belongs to the technical field of polymer orientation measurement, and more specifically, relates to a method for measuring shear orientation in a polymer layer based on an interdigitated electrode. Background technique [0002] Polymer materials play an important role in people's survival, health and development, and are widely used in various industries, such as food packaging, daily necessities, entertainment and sporting goods, medical biomaterials, coatings, information materials, aerospace materials, etc. Correspondingly, the performance requirements for polymer material products are also higher, and the research on the molding process of polymer materials is also in-depth. The processing and molding method of polymer materials is mainly injection molding. When the polymer melt enters the mold cavity, the polymer chains are in a flow field with a velocity gradient. The greater the shear rate, the more obvious the stretching and orie...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention proposes a method for measuring the shear orientation in the polymer layer based on the interdigitated electrodes. In view of the difficulties in sample preparation and complicated equipment in the measurement process of the traditional method, combined with For the dielectric anisotropy of polymer materials, a pair of adjacent interdigital electrode probes perpendicular to each other is used to measure the capacitance formed by layers of different thicknesses of the medium and the interdigital electrodes, and then the dielectric constant of the polymer material in the thickness layer is calculated size, and then describe the orientation of the layer by the difference in the dielectric constant in different directions in the layer, so as to realize the characterization and evaluation of the performance and quality of the product. The interference of the final orientation measurement results improves the accuracy of the measurement results, saves test time, saves sample preparation costs, and greatly reduces the cost of testing, especially for the measurement of shear orientation in polymer layers

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