Mechanical and thermomechanical properties of radiation modified poly(ethylene-octene)/Ni-Zn ferrite nanocomposites

International Conference on Functional Materials and Nanotechnologies 2013

材料科学;物理学

Reinholds, I.^1 ; Kalkis, V.^1 ; Zicans, J.^2 ; Meri, R Merijs^2 ; Bockovs, I.^2 ; Grigalovica, A.^2 ; Muizzemnieks, G.^1

Faculty of Chemistry, University of Latvia, 48 Valdemara Str., Riga, Latvia^1

Institute of Polymer Materials, Riga Technical University, 14 Azenes Str. 14, Riga, Latvia^2

关键词: Crosslinked structures;    Filler concentration;    Mechanical and thermo-mechanical properties;    Nickel Zinc ferrites;    Poly (ethylene-octene);    Poly(ethylene1-octene) copolymer;    Thermomechanical properties;    Thermorelaxation stress;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/49/1/012048/pdf
DOI  :  10.1088/1757-899X/49/1/012048

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Poly(ethylene-1-octene) copolymer (POE) composites filled with nickel-zinc ferrite nanoparticles have been modified by exposure to an electron beam at doses up to 500 kGy. The influence of radiation dose and ferrite content on mechanical properties has been investigated. Thermomechanical properties-thermorelaxation stresses formed in thermal heating and thermo residual stresses resulting in the process of full setting and cooling of materials have been investigated for radiation cross-linked oriented (extended up to 100%) composite samples. Increase of concentration of ferrite particles and increase of radiation dose affects a notable increase of elastic modulus and reduces the deformability in comparison to entire elastomer. Improvement of thermomechanical properties especially at low irradiation doses (100-150 kGy) have been detected for composites with increase of ferrite filler content up to 5 wt. %. It was found that gel content of POE increased up to 85% for pristine POE material with increase of irradiation dose up to 500 kGy due to the formation of cross-linked structure, increase of filler concentration up to 5 wt. % affect reduction in gel fraction due to uniform dispersion in amorphous (ethylene and substituted with hexyl branches) POE phases.