A room temperature nuclear magnetic resonance determination method of enb type EPDM rubber sequence structure distribution

Abstract

The invention relates to the technical field of rubber sequence structure distribution determination. The invention provides a normal-temperature nuclear magnetic resonance determination method for ENB type ethylene propylene diene monomer sequence structure distribution. According to the method, deuterated o-dichlorobenzene is used for dissolving a sample, a superconducting nuclear magnetic resonance spectrometer is used for carrying out nuclear magnetic quantitative carbon spectrum testing on the sample at normal temperature, spectrum peak attribution and correction are carried out on a normal-temperature nuclear magnetic quantitative carbon spectrum diagram, and sequence structure distribution of ENB type ethylene propylene diene monomer rubber is calculated through a reasonable integral formula. According to the method provided by the invention, the test cost can be effectively reduced; accuracy of test results is improved, the problems that in the prior art, a high-temperature nuclear magnetic test causes large damage to a spectrometer, and the test cost is high can be solved; the method solves the problems that the normal-temperature nuclear magnetic test is not standard enough, the normal-temperature nuclear magnetic spectrum peak attribution is not reasonable enough, the spectrum integral is not accurate enough and the like, and has certain guiding significance for microstructure characterization of ethylene propylene diene monomer, production process quality monitoring and development of new products.

Description

technical field [0001] The invention relates to the technical field of measuring the sequence structure distribution of rubber, in particular to a method for measuring the sequence structure distribution of ENB EPDM rubber at room temperature by nuclear magnetic resonance. Background technique [0002] With the continuous breakthrough and improvement of superconducting nuclear magnetic resonance (NMR) technology, liquid NMR has become the most direct and effective means to characterize the microstructure of polymer materials. Characterizing the monomer content and sequence structure of EPDM rubber by measuring its carbon NMR spectrum has always been a hot topic of research by scholars at home and abroad. [0003] At present, foreign countries mainly use high-boiling-point deuterium reagents to carry out NMR quantitative carbon spectrum testing on EPDM rubber at high temperatures. High temperature is conducive to the melting and dissolution of ethylene-propylene rubber, impro...

AI Technical Summary

Problems solved by technology

The method provided by the present invention carries out nuclear magnetic resonance test at normal temperature, which can effectively reduce the test cost, improve the accuracy of test results, and can solve the problem that the high-temperature nuclear magnetic test in the prior art has great damage to the nuclear magnetic spectrometer and high test cost. The normal temperature NMR test is not standardized enough, the peak assignment of the normal temperature NMR spectrum is not reasonable, and the spectrum integration is not accurate enough, etc.

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