Cyclic azobenzene amphiphilic segmented copolymer and its preparation method

An amphiphilic block and cyclic azobenzene technology, which is applied in organic chemistry and other fields, can solve the problems of difficult synthesis and purification structure characterization, and achieve the effect of narrow molecular weight distribution, small difference, and wide application prospects

Active Publication Date: 2014-05-28
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the difficulty in the synthesis, purification and structural characterization of α-alkynyl, ω-azide terminal linear amphiphilic block polymer precursors and their cyclic polymers, so far, in azobenzene In the study of amphiphilic polymers, cyclic azobenzene amphiphilic block copolymers have not been reported

Method used

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  • Cyclic azobenzene amphiphilic segmented copolymer and its preparation method
  • Cyclic azobenzene amphiphilic segmented copolymer and its preparation method
  • Cyclic azobenzene amphiphilic segmented copolymer and its preparation method

Examples

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Effect test

Embodiment 1

[0061] Embodiment one: Cyclic Azobenzene Amphiphilic Block Copolymer cycle -PBHME 10 - b -PAA 3 Synthesis

[0062] (1) Synthesis of side-chain azobenzene functional monomer: In a 100mL beaker, add 30mL of concentrated hydrochloric acid and 20mL of deionized water, add p-methoxyaniline (6.16g) under stirring, and cool the mixture to 3 °C; NaNO 2 (3.50g) was dissolved in 15mL deionized water and added dropwise to the above mixture. After the dropwise addition was completed, continue stirring at 3°C ​​for 1 hour to obtain a diazotized solution of methoxyaniline;

[0063] Add phenol (4.70g), water 100mL and NaOH (7.00g) into a 250mL beaker, stir evenly, cool in an ice-water bath until the solution temperature is 0°C, add the obtained diazotization solution dropwise to the phenol solution, and control the reaction solution The temperature is at 0°C. After the dropwise addition, continue to stir at 0°C for 1 h, then stir at room temperature for 2 h, filter with suction, was...

Embodiment 2

[0104] Embodiment two: Cyclic Azobenzene Amphiphilic Block Copolymer cycle -PBHME 7 - b -PAA 4 Synthesis

[0105] (1) Synthesis of side-chain azobenzene functional monomers: In a 100mL beaker, add 30mL of concentrated hydrochloric acid and 20mL of deionized water, add p-methoxyaniline (6.16g) under stirring, and cool the mixture to 5 °C; NaNO 2 (3.50g) was dissolved in 15mL deionized water and added dropwise to the above mixture. After the dropwise addition was completed, continue stirring at 5°C for 1 hour to obtain a diazotized solution of methoxyaniline;

[0106] Add phenol (4.70g), water 100mL and NaOH (7.00g) into a 250mL beaker, stir evenly, cool in an ice-water bath until the solution temperature is 5°C, add the obtained diazotization solution dropwise to the phenol solution, and control the reaction solution The temperature is at 5°C. After the dropwise addition, continue to stir at 5°C for 1 h, then stir at room temperature for 2 h, filter with suction, wash ...

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Abstract

The invention discloses a cyclic azobenzene amphiphilic segmented copolymer and its preparation method. The preparation method is concretely characterized in that the cyclic azobenzene amphiphilic segmented copolymer with controllable molecular weight, molecular weight distribution and ratio of a hydrophilic segment to a hydrophobic segment is obtained by combining through controllable atom transfer radical polymerization (ATRP) and an efficient CuAAC reaction. Compared with linear polymers having a same molecular weight, the cyclic polymer disclosed in the invention has the advantages of high Tg, fast photo-isomerization, sensitive light and pH response performances in an alkaline medium, and wide application potential in medicine release, surfactants, coatings, adhesives and separation films.

Description

technical field [0001] The invention belongs to the field of cyclic polymer materials, and in particular relates to a cyclic azobenzene amphiphilic block copolymer and a preparation method thereof. Background technique [0002] Since the cyclic polymer has no end group, the intermolecular entanglement is reduced, so it exhibits different physical properties from the linear polymer, such as smaller hydrodynamic size, lower intrinsic viscosity, larger refractive index, more High glass transition temperature. The special structure of cyclic polymers makes them have excellent properties and show broad application prospects in biological and other fields. Design and synthesize polymers with ring-topological structures containing functional groups, explore the relationship between their structures and properties, and provide a theoretical basis for the design, synthesis and application of new materials. These studies have important academic value and practical significance for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/48C08F8/00C08F293/00C08F220/16C08F212/14C07C245/08
Inventor 周年琛蔡烨朱秀林张正彪张伟潘向强
Owner SUZHOU UNIV
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