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Resin polymer with high modulus and high glass transition temperature and preparation method thereof

A technology with high glass transition and transition temperature, applied in the field of resin-based composite materials, can solve the problems of high polymer brittleness, low glass transition temperature, limitations, etc., and achieve the effect of simple process and easy promotion.

Active Publication Date: 2019-11-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above that the modulus of the resin-based composite material mainly depends on the modulus of the resin polymer, and the modulus of the above-mentioned thermosetting resin polymer is generally 2.8-4.5GPa, and there is no obvious improvement or improvement after years of research , and although the modulus of the resin system can be increased to a certain extent by increasing the cross-linking density of the polymer, it will also obviously lead to a greater brittleness of the polymer, which cannot meet the application requirements of high-strength structural materials; in addition, currently commonly used thermosetting resins The glass transition temperature is relatively low, which will be greatly limited in the application fields with strict thermal stability requirements

Method used

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  • Resin polymer with high modulus and high glass transition temperature and preparation method thereof
  • Resin polymer with high modulus and high glass transition temperature and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0051] (1) 14 grams of benzoxazine-containing nitrile-based resin and 6 grams of chain extender (containing aryl ether nitrile segmented nitrile-based resin) were sequentially added to 15 ml of N,N-dimethylformamide to obtain a uniform transparent solution;

[0052] (2) Add 2ml of toluene solvent to the homogeneous solution in (1), and adjust the reflux temperature of the system within the range of 120-155°C;

[0053] (3) Slowly raise the temperature of the obtained solution system, and control the temperature of the system within the range of 130-140° C. to stir and react for 2 hours to obtain a uniform solution with a slightly increased viscosity;

[0054] (4) Continue to raise the temperature of the solution system obtained in (3) to 150-155° C., stir vigorously, maintain the system temperature and stir for 2 hours to obtain a viscous solution system with significantly increased viscosity;

[0055] (5) Maintain the stirring rate, adjust the reaction device, connect the wate...

Embodiment 2

[0060] (1) 14 grams of benzoxazine-containing nitrile-based resin and 5 grams of chain extender (bisphenol A cyanate) were sequentially added to 15 ml of N,N-dimethylformamide to obtain a uniform transparent solution;

[0061] (2) Add 2ml of toluene solvent to the homogeneous solution in (1), and adjust the reflux temperature of the system within the range of 120-155°C;

[0062] (3) Slowly raise the temperature of the obtained solution system, and control the temperature of the system within the range of 130-140° C. to stir and react for 1 hour to obtain a uniform solution with a slightly increased viscosity;

[0063] (4) Continue to raise the temperature of the solution system obtained in (3) to 150-155° C., stir vigorously, and maintain the temperature of the system while stirring and reacting for 3 hours to obtain a viscous solution system with significantly increased viscosity;

[0064] (5) Maintain the stirring rate, adjust the reaction device, connect the water separator...

Embodiment 3

[0069] (1) 14 grams of benzoxazine-containing nitrile-based resin and 4 grams of chain extender (phenolphthalein type aryl ether nitrile) were successively added to 20 ml of N,N-dimethylformamide to obtain a uniform transparent solution;

[0070] (2) Add 3ml of toluene solvent to the homogeneous solution in (1), and adjust the reflux temperature of the system within the range of 120-155°C;

[0071] (3) Slowly raise the temperature of the obtained solution system, and control the temperature of the system within the range of 130-140° C. to stir and react for 2 hours to obtain a uniform solution with a slightly increased viscosity;

[0072] (4) Continue to raise the temperature of the solution system obtained in (3) to 150-155° C., stir vigorously, and maintain the temperature of the system while stirring and reacting for 3 hours to obtain a viscous solution system with significantly increased viscosity;

[0073] (5) Maintain the stirring rate, adjust the reaction device, connec...

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Abstract

The invention discloses a resin polymer with high modulus and high glass transition temperature, which comprises the following components: nitrile-based resin containing benzoxazine, chain extender and N,N-dimethyl formamide. The preparation method comprises the following steps: sequentially adding nitrile-based resin containing benzoxazine and the chain extender to N,N-dimethyl formamide to obtain a homogeneous transparent solution; adding toluene solvent into the obtained solution, and adjusting the reflux temperature of the system; controlling the system temperature to be 130-155 DEG C, stirring to obtain a viscous solution system; transferring to a preheated mold, drying and molding at 120-200 DEG C; at that end of the heat treatment, obtaining the resin polymer by slowly lowering thetemperature and demoulding. The present invention provides a resin polymer with high modulus and high glass transition temperature through molecular structure design, utilizes ordered reaction among functional groups to control polymerization degree and spatial arrangement of the resin polymer.

Description

technical field [0001] The invention relates to the technical field of resin-based composite materials, in particular to a resin polymer with high modulus and high glass transition temperature and a preparation method thereof. Background technique [0002] With the rapid development of materials in the aerospace and rail transit fields, related fields put forward requirements for lightweight and high-performance new materials used in harsh environments. Among them, resin-based composite materials are globally recognized due to their high specific strength and lightweight s concern. [0003] As we all know, the performance of resin-based composites mainly depends on the resin polymer, the reinforcement and the combination between the resin and the reinforcement. As the currently recognized reinforcing fiber material with the best specific strength, carbon fiber has been widely used in aerospace, track Structural materials in transportation and other fields, and exhibit excel...

Claims

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Application Information

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IPC IPC(8): C08G14/073C08L61/34
CPCC08G14/06C08L61/34
Inventor 徐明珍李博任登勋陈林陈思静李逵袁悦刘孝波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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