New Conductive Polymer Material and Membrane Conductivity Meter

Recently, the Changchun Institute of Applied Chemistry of the Chinese Academy of Sciences, which is responsible for the Jilin Province Science and Technology Development Program, “Crosslinked Conductive Polymer Materials and Their Applications in Analytical Chemistry”, has passed the expert appraisal organized by the Science and Technology Department of Jilin Province. The expert group believes that this device is the first in the country and the relevant research results are highly innovative and have reached the leading level of domestic similar research.

It is understood that ion detection technology has extremely important significance in modern industry, biotechnology and environmental protection. For example, with the development of modern industry, a large number of metal cations discharged into the surrounding environment, such as lead, mercury and other heavy metal cations, are extremely harmful to the human body, and the detection and treatment of important ions has become a very important issue. In the electrochemical analysis of ions, ion-selective electrodes have been a commonly used rapid and simple method of detection. However, the existing conductive polymer composite membrane materials have the disadvantages of being easily peeled off from the electrode surface, swelling, poor stability and reproducibility.

Researcher Niu Li led the Electrochemistry Task Force of Materials of Changchun Institute of Chemistry, Chinese Academy of Sciences. In 2005, he undertook the “cross-linked conductive polymer materials and their applications in analytical chemistry”. For the first time, they introduced a flexible chain-linked bithiophene monomer into a conducting polymer, synthesized a flexible chain and a bifunctional thiophene monomer with a specific functional group, and prepared a three-dimensionally adjustable cavity molecule with a conducting polythiophene skeleton. The novel network-like conductive polymer of the structure imparts species selectivity directly to the bulk of the conductive polymer film through functional groups on the flexible chain. The pore structure in the cross-linked structure of the conductive polymer film can be controlled by adjusting the proportion of the polymer monomer and the length of the flexible chain, so as to achieve a selective response to the target species, in the field of analytical detection and separation enrichment. Widely used.

As one of the important characterization methods for conductive polymer materials, they also successfully developed the electrochemical in-situ film conductivity measuring instrument, which can simultaneously combine the electrochemical method with the conductive polymer film conductivity measurement in electrochemical signals. At the same time, the change of the conductivity of the membrane can be measured in real time, which is the first in China.