Azo monomers and azo polymers prepared by polymerization of azo monomers
An azo polymer and monomer technology, applied in the field of metal ion sensors and metal ion scavengers, can solve the problems of unresearched characteristics and applications
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0068] The length of such an alkyleneoxy group can be easily controlled using an appropriate precursor as in Preparation Examples 2 to 4 described below. refer to figure 1 , as the length of the alkyleneoxy group increases, the glass transition temperature, nematic liquid crystal transition temperature and melting point of the azo polymer tend to decrease. Therefore, by controlling the length of the alkyleneoxy group of Chemical Formula 1, the heat resistance and the like of the azo polymer can be easily controlled.
[0069] In Chemical Formula 1, m may be an integer of 1 to 5, and when m is 2 or more, two or more R 2 Can be all the same, or two or more R 2 At least one of may be different. More suitably, m may be an integer of 1 to 3 or an integer of 1. Referring to the following experimental examples, the shorter the length of the alkyleneoxy group, the stronger the binding force between the azo polymer and the specific metal ion may become. Meanwhile, regardless of the...
preparation example 1
[0095] Preparation Example 1: Synthesis of 4-dodecyl-4'-hydroxyazobenzene (DHAB)
[0096] p-Dodecylaniline (97%, 5.00g, 18.60mmol), HCl (4.85mL, 55.00mmol), NaNO 2 (1.32 g, 18.60 mmol), 156 mL THF and 39 mL distilled water were put into a 500 mL 3-neck round bottom flask, and the solution was stirred at 0° C. for 2 hours under nitrogen atmosphere. Subsequently, phenol (1.77 g, 18.60 mmol), K 2 CO 3 (1.30g, 19.10mmol), Na 2 CO 3 (1.44g, 27.10mmol), 128mL THF and 32mL H 2 O, and the solution was stirred at room temperature for another 12 hours. Thereafter, the solvent was removed from the reaction solution using a rotary evaporator. The solid thus obtained was put into a separatory funnel containing 300 mL of dichloromethane (MC) and 300 mL of distilled water and vigorously shaken, and then the aqueous solution layer in which unreacted salt was dissolved was removed. 10.0 g of anhydrous magnesium sulfate was introduced into the remaining MC solution, the solution was st...
preparation example 2
[0100] Preparation Example 2: Synthesis of 2-(4-dodecylazobenzene-4'-oxyl)ethanol (DAEA-S1)
[0101] DHAB (5.00g, 13.60mmol) synthesized in Preparation Example 1, K 2 CO 3 (1.14 g, 8.25 mmol) and 50 mL of diglyme were placed in a 2-neck round bottom flask, and the solution was stirred at room temperature under nitrogen atmosphere for 30 minutes. 2-Chloroethanol (2.20 g, 27.28 mmol) was introduced into the solution, and the solution was stirred at 140°C for a further 48 hours. Pour the reaction solution into 1 LH 2 Precipitate in O and stir for 1 h to dissolve unreacted K 2 CO 3 , followed by filtration to obtain a solid precipitate containing unreacted DHAB and product. The precipitate was dissolved in 200 mL of chloroform, 10.0 g of anhydrous magnesium sulfate was introduced thereinto, the solution was stirred for 30 minutes and filtered to remove traces of water dissolved in the precipitate. The solvent of the filtered chloroform solution was evaporated, and then the...
PUM
| Property | Measurement | Unit |
|---|---|---|
| glass transition temperature | aaaaa | aaaaa |
| melting point | aaaaa | aaaaa |
| melting point | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More