Preparation Of Low Density Polyethylene/Carbon Nanoparticle Composites And Study Of Their Electron Irradiation Properties

Polymer materials have the advantages of light weight,high performance,low cost,and processability,and are widely used in the field of anti-radiation materials for spacecraft.However,the performance of a single polymer material often fails to meet human requirements for aerospace materials.As a typical aerospace material,polyethylene is particularly important to improve the performance of polyethylene.In this paper,by combining polyethylene and carbon nanoparticles with excellent physical properties,the structure and performance of the composite material are characterized and analyzed.Using disodium ethylenediaminetetraacetic acid as the carbon source,carbon nanoparticles(CNPs)with a fluorescent effect and a particle size of about 5 nm were prepared by hydrothermal synthesis,and the structure and performance of the prepared CNPs were Characterization,compounding low-density polyethylene(LDPE)with CNPs by solvent dissolution method,and finally obtained mass fractions: 0 wt.%LDPE/CNPs,2 wt.%LDPE/CNPs,5 wt.%LDPE/CNPsand 10 wt.%LDPE/CNPs composite material.The structure and properties of LDPE/CNPs composites with different CNPs content were characterized.The XRD test results show that with the addition of different CNPs content,the crystal phase content increases first and then decreases.Mainly due to the presence of a large number of functional groups such as hydroxyl(-OH)and carboxyl(-COO-)on the surface of CNPs,the presence of these functional groups promotes the crystallization of LDPE and increases the crystal strength.The FTIR test results showed that with the increase of CNPs content,the infrared spectrum of the composite did not change,indicating that the introduction of CNPs did not destroy the structure of LDPE and generate new functional groups.The optical performance test results show that as the content of CNPs increases,the light transmittance increases first and then decreases.At the content of 5 wt.% CNPs,the LDPE/CNPs composite material reaches the maximum light transmittance,indicating that the 5 wt.% LDPE/CNPs composite There are few defects in the material.The 1 Me V electron irradiation of different CNPs content and different radiation doses(5×1014 cm-2,1×1015 cm-2,3×1015 cm-2,5×1015 cm-2)on the composite structure and Performance research.The XRD results show that under electron irradiation,as the content of CNPs increases,the crystallinity of the LDPE/CNPs composite decreases.FTIR results show that electron irradiation can cause LDPE to break bonds,forming alkyl radicals and peroxy radicals.In the presence of oxygen,free radicals react with oxygen to form small molecules such as ketones and water,causing holes and performance reduce.In the FTIR spectrum,it appears as the appearance of new functional groups(C=O).As the content of CNPs increases,the characteristic peak of the functional group(C=O)weakens,indicating that the addition of CNPs inhibits the oxidation of LDPE and shows better resistance to electronic protection.The optical performance results show that under the same irradiation dose of electron irradiation,as the content of CNPs increases,the light transmittance of the LDPE/CNPs composite increases,and the light transmittance of the 5 wt.% LDPE/CNPs composite reaches the highest.It shows that 5 wt.% LDPE/CNPs composites contain the fewest defects.