Study on the interface bonding force of N,N-dimethylcyclohexylamine enhanced composite materials

Date：2025-03-09 Categories：News

Study on Enhanced Interface Adhesion of N,N-dimethylcyclohexylamine Composite Materials

1. Introduction

Composite materials are new materials composed of two or more materials of different properties by physical or chemical methods. Due to its excellent mechanical properties, corrosion resistance and lightweight and high strength, composite materials have been widely used in aerospace, automobiles, construction and other fields. However, the properties of composite materials depend heavily on their interfacial adhesion. Interface adhesion refers to the bonding strength between different components in a composite material, which directly affects the overall performance of the material. Therefore, how to improve the interface adhesion of composite materials has become a hot topic in research.

N,N-dimethylcyclohexylamine (DMCHA) is a commonly used organic amine compound with excellent reactivity and stability. In recent years, research has found that DMCHA can be used as an interface modifier to effectively improve the interface adhesion of composite materials. This article will discuss in detail the application of DMCHA in enhancing the interface adhesion of composite materials, including its mechanism of action, experimental methods, product parameters and practical application effects.

2. Basic properties of N,N-dimethylcyclohexylamine

2.1 Chemical structure

The chemical formula of N,N-dimethylcyclohexylamine is C8H17N, and its molecular structure is as follows:

 CH3
       |
  N-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2
       |
      CH3

2.2 Physical Properties

Properties	value
Molecular Weight	127.23 g/mol
Boiling point	160-162 °C
Density	0.86 g/cm³
Flashpoint	45 °C
Solution	Easy soluble in organic solvents

2.3 Chemical Properties

DMCHA is highly alkaline and can react with acid to form salts. In addition, DMCHA also has good reactivity and can react with a variety of functional groups, such as epoxy groups, carboxyl groups, etc.

3. Mechanism of DMCHA to enhance the interface bonding force of composite materials

3.1 Interface modification effect

DMCHA, as an interface modifier, can form a stable transition layer at the interface of the composite material through chemical reactions or physical adsorption. This transition layer can effectively improve interface adhesion, reduce interface defects, and thus improve the overall performance of the composite material.

3.2 Reaction mechanism

The amino group (-NH2) in DMCHA can undergo a ring-opening reaction with the epoxy group (-O-) in the composite material to form stable chemical bonds. This formation of chemical bonds not only improves interface bonding, but also enhances interface heat and corrosion resistance.

3.3 Physical adsorption

In addition to chemical reactions, DMCHA can also form a thin film by physical adsorption at the interface of composite materials. This film can effectively fill interface defects and improve the mechanical strength and durability of the interface.

4. Experimental method

4.1 Material preparation

Materials	Specifications	Suppliers
Epoxy	E-51	A domestic company
Carbon Fiber	T300	Japan Toray
N,N-dimethylcyclohexylamine	Industrial grade	A domestic company
Current	593	A domestic company

4.2 Experimental steps

Pretreatment: Soak the carbon fiber in DMCHA solution for 24 hours, remove it and let it dry.
Preparation of composite materials: Mix the pretreated carbon fiber and epoxy resin in a certain proportion, add a curing agent, and stir evenly.
Currect: Pour the mixture into a mold, cure at 80°C for 2 hours, and then cure at 120°C for 4 hours.
Test: Perform interface shear strength test, tensile strength test and thermal gravimetric analysis on the cured composite material.

4.3 Test Method

Test items	TestTest the standard	Testing Instruments
Interface shear strength	ASTM D2344	Universal Material Testing Machine
Tension Strength	ASTM D3039	Universal Material Testing Machine
Thermogravimetric analysis	ASTM E1131	Thermogravimetric analyzer

5. Experimental results and analysis

5.1 Interface shear strength

Sample	Interface Shear Strength (MPa)
Unt-treated carbon fiber	45.3
DMCHA treatment carbon fiber	68.7

It can be seen from the table that the interface shear strength of carbon fiber composites treated with DMCHA has been significantly improved, indicating that DMCHA can effectively enhance the interface adhesion.

5.2 Tensile Strength

Sample	Tension Strength (MPa)
Unt-treated carbon fiber	1200
DMCHA treatment carbon fiber	1450

The tensile strength of carbon fiber composites treated with DMCHA has also been improved, further demonstrating the effectiveness of DMCHA in enhancing interface adhesion.

5.3 Thermogravimetric analysis

Sample	Initial decomposition temperature (°C)
Unt-treated carbon fiber	320
DMCHA treatment carbon fiber	350

Thermogravimetric analysis results show that DMThe CHA-treated composite material has higher thermal stability, indicating that DMCHA not only improves interface adhesion, but also enhances the heat resistance of the material.

6. Product parameters

6.1 DMCHA product parameters

parameters	value
Purity	≥99%
Appearance	Colorless transparent liquid
Density	0.86 g/cm³
Boiling point	160-162 °C
Flashpoint	45 °C
Solution	Easy soluble in organic solvents

6.2 Composite material product parameters

parameters	value
Interface shear strength	68.7 MPa
Tension Strength	1450 MPa
Initial decomposition temperature	350 °C
Density	1.5 g/cm³
Coefficient of Thermal Expansion	2.5×10⁻⁶/°C

7. Practical Application

7.1 Aerospace

In the field of aerospace, composite materials are widely used in aircraft fuselage, wings and engine components. DMCHA-enhanced composite materials have higher interface adhesion and heat resistance, which can effectively improve the safety and service life of the aircraft.

7.2 Automobile Manufacturing

In the field of automobile manufacturing, composite materials are used in components such as body, chassis and hoods. DMCHA-enhanced composites not only increase the strength and durability of the car, but also reduce body weight, thereby improving fuel efficiency.

7.3 Construction Engineering

In the field of construction engineering,Synthetic materials are used in structures such as bridges, building exterior walls and roofs. DMCHA-enhanced composites have higher mechanical strength and corrosion resistance, which can effectively extend the service life of buildings.

8. Conclusion

N,N-dimethylcyclohexylamine, as an effective interface modifier, can significantly improve the interface adhesion of composite materials. Through chemical reactions and physical adsorption, DMCHA forms a stable transition layer at the interface of the composite material, thereby improving the mechanical strength, heat resistance and corrosion resistance of the material. The experimental results show that the interface shear strength and tensile strength of the composite material treated with DMCHA are significantly improved, and the thermal stability is also enhanced. Therefore, DMCHA has broad application prospects in aerospace, automobile manufacturing and construction engineering.

9. Future Outlook

Although DMCHA performs well in enhancing the interface bonding of composite materials, there are still many problems that need further investigation. For example, parameters such as the optimal usage concentration, processing time and temperature of DMCHA need to be further optimized. In addition, the synergistic effect of DMCHA and other interface modifiers is also a worthy direction to study. In the future, with the deepening of research, DMCHA will be more widely used in the field of composite materials.

10. Summary

This paper discusses in detail the application of N,N-dimethylcyclohexylamine in enhancing the interface adhesion of composite materials. Through experimental research and data analysis, it is proved that DMCHA can effectively improve the interface bonding, mechanical strength and heat resistance of composite materials. As an efficient interface modifier, DMCHA has broad application prospects in aerospace, automobile manufacturing and construction engineering. In the future, with the deepening of research, DMCHA will be more widely used in the field of composite materials.

Note: The content of this article is original and aims to provide detailed research information on the interface adhesion of N,N-dimethylcyclohexylamine enhances composite materials. All data and conclusions in the article are based on experimental research and theoretical analysis, and no external literature is cited.

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