Cross-linking density measurement method and device

Abstract

The invention provides a cross-linking density measurement method, which comprises the steps of acquiring a nuclear magnetic resonance double-quantum sequence and a plurality of preset regularization parameters, and determining a double-quantum growth signal and a reference attenuation signal of a to-be-measured sample by using the nuclear magnetic resonance double-quantum sequence; fitting the difference signal of the double-quantum growth signal and the reference attenuation signal, and determining the non-coupling component of the double-quantum growth signal; normalizing the double-quantum growth signal based on the uncoupled component and the reference attenuation signal, and calculating a normalized double-quantum growth signal; performing regularization inversion on the normalized double-quantum growth signal according to each preset regularization parameter, and determining a residual dipole coupling distribution result of the to-be-tested sample; and converting a residual dipole coupling distribution result into a cross-linking density distribution result by using a corresponding relationship between residual dipole coupling and cross-linking density. According to the invention, complete measurement of rubber cross-linking density distribution is realized, and the reliability of a final result is ensured.

Description

technical field [0001] The invention relates to the technical field of double quantum data processing, in particular to a method and device for measuring crosslinking density. Background technique [0002] Polymer elastic materials are one of the important basic industries of the national economy. Rubber is the most representative type of elastic materials. In addition, there are many elastic polymers, such as polyurethane elastomers and SBS elastomers. The crosslink density is the number of crosslink bonds in the crosslinked polymer, which is a very important physical quantity to evaluate the performance of elastomers. [0003] At present, the commonly used methods for measuring the crosslink density of elastomers include equilibrium swelling method, mechanical testing method and nuclear magnetic resonance method. The equilibrium swelling method and the mechanical test method have the disadvantages of long test period, many influencing factors, poor measurement accuracy an...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a method and device for measuring cross-linking density, which solves the problem that the existing two-quantum method is difficult for data analysis, and the analysis results are easily affected by subjective factors, resulting in low efficiency.

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