The parameters affecting the molecular weight, molecular weight distribution, stereoregularity, crystallinity, molecular structure and other molecular aggregation states of the polymer all have an effect on the photoconductive properties. Photoconductivity refers to a phenomenon in which the concentration of carriers contributing to electron conduction is increased by photoexcitation. In fact, all insulators and semiconductors with poor electrical conductivity are almost or less photoconductive. However, generally referred to as a photoconductive substance, those having a large ratio of photocurrent to dark current, that is, a material having high quantum efficiency, long life, and large carrier mobility of photogenerated carriers. From the structural division, it is generally believed that there are four types of antistatic clothing with photoconductivity: 4 a high degree of linear or planar conjugate structure in the polymer backbone, the current carrying capacity of this type of antistatic shoe material The child is a free electron. 2 The polymer has a large conjugated structure on its side chain, and a polycyclic aromatic hydrocarbon such as a naphthyl group, an anthracenyl group or a pyridyl group is attached to the side chain of the polymer. (3) A substance containing a heterocyclic compound such as an aromatic amine or a nitrogen-containing heterocyclic ring in a polymer side chain or a main chain. 4 polymer charge transfer complex and others.
1. Antistatic shoe material with high conjugated molecules in the polymer backbone
The linear conjugated polymer material is an intrinsically conductive polymer antistatic shoe material, which has a high light absorption coefficient in the visible light region, and generates soli, polaron and double polaron in the molecule after absorbing light energy. The neutrons thus exhibit strong photoconductivity. Since most linear conjugated conductive polymer antistatic shoe materials have poor stability and processing properties, they have not been widely used. Among them, polyphenylacetylene and polythiophene conjugate antistatic shoes are widely used as electron donors, and as photoconductive materials, it is necessary to provide electron acceptors in the system. 2. Photoconductive polymer material having a large conjugated structure or a heterocyclic structure in a side chain
In the photoconductive antistatic clothing material having such a structure, the carbazole group and the photosensitizing structure (electron acceptor) are connected by a saturated carbon chain. Compared with other photoconductive antistatic materials, this structure has the advantages of F: 1 The ratio of the electron donor and electron acceptor on the side chain of the polymer and the order of bonding can be designed by controlling the reaction conditions. 2 The mechanical properties of the formed photoconductive film can be improved by changing the monomer structure and composition. 3 Electron acceptors with different electron affinity can be selected to participate in the polymerization reaction, so that the generated photoconductive antistatic clothing can adapt to different wavelengths of light. Some of the polymer structures containing carbazole rings are listed below. Some of these reaction conditions are harsh and the use of higher-priced iodides must be used in excess.
