Aromatic polyesterimide and preparation method thereof

A polyester imide and aromatic technology, applied in the field of high-performance polymers, can solve the problems of easy warping and cracking of parts, difficult material processing and molding, and large residual stress of parts, etc., to achieve structural symmetry reduction, Effects of reduced crystallinity and high Tg

Active Publication Date: 2017-06-09
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, polyester imide is generally a fully aromatic structure, and there is a very strong π-π interaction force between the imide rings, so that the molecular structure is arranged regularly, and its melting temperature ( T m ) is high, even when the temperature reaches the decomposition temperature of the material, there is no melting, which makes the processing and molding of the material difficult, the residual stress of the part is large, and the part is easy to warp and crack

Method used

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  • Aromatic polyesterimide and preparation method thereof
  • Aromatic polyesterimide and preparation method thereof
  • Aromatic polyesterimide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation of aromatic diphenol monomers containing imide bonds: 294.22g of 2,2',3,3'-biphenyltetracarboxylic dianhydride, 218.26g of 3-aminophenol and 200mL of acetic acid were added for reaction React in a container at a temperature of 130°C for 6 hours under nitrogen protection; after the reaction, filter, wash, and dry to obtain a light yellow powder, which is an aromatic diphenol monomer containing an imide bond, which is designated as IM1.

[0029] 2. Preparation of polyester imide from aromatic diphenol monomers containing imide bonds and meta-aromatic diacid monomers: add 238.22g IM1, 82.06g 1,3-meta Phthalic acid, 69.06 g 4-hydroxybenzoic acid, 142 mL acetic anhydride, and 49.07 mg potassium acetate. The flask was fitted with a sealed glass paddle stirrer, a nitrogen inlet tube and an insulated distillation head. A moderate nitrogen flow was introduced, and the acetylation reaction was carried out at a temperature of 140° C. for 60 minutes. The reaction m...

Embodiment 2

[0036] According to the preparation method of Example 1, the aromatic diphenol monomer IM1 containing imide bonds is obtained, and it is reacted with the meta-position aromatic diacid monomer to prepare polyester imide. The specific steps are: in a 2000mL three-hole round bottom The flask was charged with 476.44 g of IM1, 242.23 g of 1,1'-biphenyl-3,3'-dicarboxylic acid, 428.44 g of 4'-hydroxybiphenyl-4-carboxylic acid, 500 mL of acetic anhydride and 82 mg of sodium acetate. The flask was fitted with a sealed glass paddle stirrer, a nitrogen inlet tube and an insulated distillation head. A moderate nitrogen flow was introduced, and the acetylation reaction was carried out at a temperature of 120° C. for 60 minutes. The reaction mixture was heated (0.8°C / min) in a quicksand bath, and the reaction temperature rose from 120°C to 300°C. At this point, the reaction system was slowly evacuated (vacuum degree: 1 mbar), and kept at 300° C. for 30 min. The opaque melt was cooled to r...

Embodiment 3

[0045] The aromatic diphenol monomer IM1 containing imide bonds prepared in Example 1 and the meta-position aromatic diacid monomer are used to prepare polyester imide: add 238.22g IM1, 108.10 in a 500mL three-necked round bottom flask g 1,7-naphthalene dicarboxylic acid, 94.09 g 6-hydroxy-2-naphthoic acid, 80 mL acetic anhydride, and 8.20 mg stannous octoate. The flask was fitted with a sealed glass paddle stirrer, a nitrogen inlet tube and an insulated distillation head. A moderate nitrogen flow was introduced, and the acetylation reaction was carried out at a temperature of 140° C. for 60 minutes. The reaction mixture was heated (1.0°C / min) in a quicksand bath, and the reaction temperature rose from 140°C to 320°C. At this point, the reaction system was slowly evacuated (vacuum degree: 5 mbar), and kept at 320° C. for 15 min. The opaque melt was cooled to room temperature and the product was removed from the flask and ground to a fine powder. Finish polycondensation reac...

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Abstract

The invention discloses aromatic polyesterimide and a preparation method thereof. The preparation method includes adding aromatic diacid anhydride monomers, amino meta-substituted aromatic phenol monomers and acetic acid into a reactor to obtain aromatic diphenol monomers containing imide linkages, subjecting the aromatic diphenol monomers containing the imide linkages, meta-position aromatic diacid monomers, AB-type wholly-aromatic monomers containing terminal carboxyl groups A and terminal hydroxyl groups B, a catalyst and acetic anhydride to acetylation reaction prior to transesterification, grinding an obtained product into fine powder and subjecting the fine powder to condensation polymerization so as to obtain the aromatic polyesterimide. The preparation method has the advantages that self-enhancement of tensile strength and Tg is achieved in a polymerization process of the aromatic polyesterimide, low melt viscosity is obtained through structural symmetry decrease of the aromatic polyesterimide, and the preparation method is simple and controllable in preparation technology.

Description

technical field [0001] The invention relates to an aromatic polyester imide and a preparation method thereof, belonging to the technical field of high-performance polymers. Background technique [0002] Polyesterimide is a modified polyimide, which combines the advantages of high elastic modulus, high breaking strength and good dimensional stability of polyester polymers, as well as the high thermal stability of polyimide. properties, high glass transition temperature ( T g ), and excellent mechanical properties at high temperatures. [0003] At present, polyester imide is generally a fully aromatic structure, and there is a very strong π-π interaction force between the imide rings, so that the molecular structure is arranged regularly, and its melting temperature ( T m ) is high, even when the temperature reaches the decomposition temperature of the material, there is no melting, which makes the processing and molding of the material difficult, the residual stress of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/16
Inventor 顾嫒娟管清宝梁国正袁莉
Owner SUZHOU UNIV
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