Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation and Application of Side Chain Sulfonated Polyimide Bridged by Quinoxaline Group

A technology of sulfonated polyimide and quinoxaline group is applied in the preparation of proton exchange membrane and the preparation of side chain sulfonated polyimide, which can solve the synthesis of side chain sulfonated diamine monomer The problems of complex process, low yield and complex polymerization process can achieve the effects of excellent mechanical properties and thermal stability, high proton conductivity and broad application prospects.

Inactive Publication Date: 2020-06-26
南京黑泰催化剂有限公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymerization process is more complicated, and the synthesis process of the side chain type sulfonated diamine monomer used is complicated and the yield is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation and Application of Side Chain Sulfonated Polyimide Bridged by Quinoxaline Group
  • Preparation and Application of Side Chain Sulfonated Polyimide Bridged by Quinoxaline Group
  • Preparation and Application of Side Chain Sulfonated Polyimide Bridged by Quinoxaline Group

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0049] The present invention also proposes a preparation method of side chain type sulfonated polyimide bridged by quinoxaline groups, including the preparation method of sulfonated polyimide homopolymer and sulfonated polyimide copolymer, wherein The preparation method of the sulfonated polyimide homopolymer (y=1) with general formula (I or II) comprises the following steps:

[0050] Under nitrogen protection, dissolve 4,4'-bis(4-amino-phenoxy)benzil in an organic solvent, and then add 4,4'-bis(4-amino-phenoxy)benzil Acyl equimolar dianhydride monomer and a certain amount of organic weak acid, react the reaction system at 50-120°C for 1-8h, then react at 140-220°C for 8-24h, then cool the system to 70-100°C, and then add With 4,4'-bis(4-amino-phenoxy)benzil equimolar sulfonated diamine and a certain amount of organic weak base, react for 2-4 hours, after the reaction, pour it into methanol to obtain a filamentous The product is dried under vacuum after repeated washing to ob...

Embodiment 1

[0060] Example 1: Synthesis of a side-chain sulfonated polyimide homopolymer bridged by quinoxaline groups and preparation of a proton exchange membrane:

[0061] Under nitrogen protection and mechanical stirring, add 4,4'-bis(4-amino-phenoxy)benzil 4.24g (10mmol) and m-cresol 50-130mL into a dry 250mL three-necked flask, After complete dissolution, add 2.68g (10mmol) of 1,4,5,8-naphthalene tetracarboxylic dianhydride and 1.22-3.66g (10-30mmol) of benzoic acid. Preferably, the optimal addition amount of m-cresol in the present embodiment is 70mL, and benzoic acid is 2.44g (20mmol). First react the reaction system at 50-120°C for 1-8h, then react at 140-220°C for 8-24h, then cool the system down to 70-100°C, then add 4-(3,4-diamino-phenoxy )-1,3-benzenedisulfonic acid 3.60g (10mmol) and triethylamine 2.02-4.04g (20-40mmol), react for 2-4h, preferably, the three temperatures in this embodiment are 100°C, At 180°C and 80°C, the three times are 4h, 20h, and 4h respectively, and ...

Embodiment 2

[0063] Example 2: Synthesis of a side-chain sulfonated polyimide copolymer bridged by quinoxaline groups and preparation of a proton exchange membrane:

[0064] Under the protection of nitrogen and mechanical stirring, add 4.24g (10mmol) of 4,4'-bis(4-amino-phenoxy)benzil and 65mL of m-cresol to a dry 250mL three-necked flask, and wait for complete After dissolution, 2.68 g (10 mmol) of 1,4,5,8-naphthalene tetracarboxylic dianhydride and 3.05 g (25 mmol) of benzoic acid were added. First react the reaction system at 100°C for 4h, then react at 180°C for 20h, then cool the system down to 80°C, then add 4-(3,4-diamino-phenoxy)-1,3-benzenedisulfonic acid 1.80g (5mmol) and triethylamine 1.52g (15mmol), reacted for 4h. All the other experimental procedures were the same as in Example 1.

[0065] The preparation method of the proton exchange membrane is the same as in Example 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses quinoxaline group bridged side-chain type sulfonated polyimide, and a preparation method of the quinoxaline group bridged side-chain type sulfonated polyimide and a method forpreparing a proton exchange membrane prepared from quinoxaline group bridged side-chain type sulfonated polyimide, hydrophobic quinoxaline groups are formed on a main chain ,and molecular chains containing sulfonic acid groups are introduced to side chains of polymer molecules to not only ensure the flexibility of the side chains, but also facilitate the formation of a microphase separation structure, and furthermore, the molecular weight is higher, the thermal stability is high and the hydrolysis is stable; and the quinoxaline group bridged side-chain type sulfonated polyimide disclosed by the invention is simple in preparation process, easy to operate and control in reaction conditions and suitable for industrial production. The proton exchange membrane prepared from quinoxaline group bridged side-chain type sulfonated polyimide disclosed by the invention has higher proton conductivity and excellent mechanical properties, and broad application prospects.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a preparation method of a side-chain sulfonated polyimide bridged by quinoxaline groups and a preparation method of a proton exchange membrane. Background technique [0002] Sulfonated polyimide membrane has the advantages of good physical and chemical stability, heat resistance, high mechanical strength, easy preparation and low price, and has become a research hotspot in the field of high-performance proton exchange membrane materials. However, due to the weakness of the imide ring itself in the structure of this type of polymer, its hydrolytic stability is not good. Generally, the water resistance can be improved by changing the monomer structure, such as introducing monomers containing flexible groups, introducing diamine monomers with high basicity, introducing side chain type sulfonated diamine monomers, etc. The type of sulfonated diamine monomer is considered to be a ver...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08G73/10
CPCC08G73/1028C08G73/1042C08G73/105C08G73/1064C08G73/1071C08J5/2256C08J2379/08
Inventor 王卫霞陈康成翟凤霞房建华
Owner 南京黑泰催化剂有限公司