A kind of synthetic method of helical structure polyaniline nanofiber
A synthesis method and nanofiber technology are applied in the synthesis field of helical structure polyaniline nanofibers, which can solve the problems of low optical activity of polyaniline, and achieve the effects of huge application potential, high specific surface area and increasing polymerization rate.
Active Publication Date: 2016-05-04
HARBIN ENG UNIV
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However, the optical activity of polyaniline synthesized by the above general method is low. In order to obtain a chiral polyaniline stationary phase with high separation efficiency, the synthesized polyaniline needs to have high optical activity and specific surface area. Therefore, the synthetic polyaniline with high optical activity Polyaniline Nanofibers Become Necessary
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[0017] The following examples describe the present invention in more detail.
[0018] 1. Synthesis of N,N'-bis(4'-aminobenzene)-1,4-phenylenediamine
[0019] Dissolve 0.6-0.8g of p-phenylenediamine and 1.0-1.5ml of aniline in 40ml of 1M hydrochloric acid solution containing 3-4g of sodium chloride, then cool to -5°C, stir vigorously, and dissolve 1.2-1.8g of ammonium persulfate in 10ml of 1M hydrochloric acid , add dropwise with a 10ml needle tube, stir for 1 hour after the addition, wash the product with 30-50ml of hydrochloric acid at 0°C, then wash with 10-15ml of ammonia water (10%), and finally wash with water until neutral, dry at 50°C to obtain a red solid. The solid was dissolved in ethanol, under N2 protection, hydrazine hydrate was added dropwise, and refluxed at 70-80° C. for 3-5 hours to obtain white particles.
[0020] 2. Preparation of helical polyaniline nanofibers
[0021] Weigh 1.8~2.3g D-(+)-camphorsulfonic acid (CSA) or L-(-)-camphorsulfonic acid (CSA) an...
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Abstract
The invention provides a synthetic method of polyaniline nanofiber with a helical structure. The method comprises the following steps: firstly synthesizing N, N'-2(4-phenylene diamine)-1 and 4-phenylene diamine; secondly taking N, N'-2(4-phenylene diamine)-1 and 4-phenylene diamine as a polymerization reaction catalyst, chiral camphor sulfonic acid as an inducer and a doping agent, and ammonium persulfate as an oxidizing agent; finally synthesizing the polyaniline nanofiber with the helical structure through adopting the chemical oxidative polymerization. According to the synthetic method, the chiral camphor sulfonic acid is adopted as the doping agent to be interacted with the polyaniline main chain and to induce the polyaniline main chain to form the helical structure, and meanwhile, N, N'-2(4- phenylene diamine)-1 and 4-phenylene diamine with the oxidation potential lower than that of monomer aniline is further added to serve as a 'seed' and catalyze the polymerization reaction, so that the polymerization rate is greatly increased with the addition of phenylene diamine, and besides, heterogeneous nucleation is under restriction in the polymerization process, giving rise to the predominance of homogeneous nucleation, so that secondary growth is inhibited, the formation of the polyaniline helical structure is facilitated, and the optical activity of polyaniline is greatly improved.
Description
technical field [0001] The invention relates to a method for synthesizing a polymer, in particular to a method for synthesizing polyaniline nanofibers with a helical structure. Background technique [0002] The helical structure ubiquitous in important biopolymers (such as proteins, nucleotides, and DNA) plays a pivotal role in the metabolic processes of animals and plants, in which the active sites of enzymes are almost exclusively bound to an opposite Enantiomeric chiral substrate binding. Chiral control is often a critical factor in the design of effective drugs and pesticides. Therefore, people have been interested in the design and synthesis of chiral polymers for decades, and a large number of organic polymers have been synthesized and applied in many different fields, such as chiral sensors, chiral catalysts, and enantio Chromatographic separation of body drugs. [0003] In 1985, Baughman et al. proposed that pure substituents with a single optical activity or chir...
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IPC IPC(8): C08G73/02
Inventor 李瑞琦代继金李玉发周丹
Owner HARBIN ENG UNIV