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Thermal and dielectric properties of low-density polyethylene/NaA zeolite composites
Polymer International ( IF 2.9 ) Pub Date : 2021-08-14 , DOI: 10.1002/pi.6284 Filip Marinković 1 , Dušan Popović 1 , Jelena Jovanović 2 , Branislav Stanković 3 , Sanja Jevtić 4 , Borivoj Adnadjević 3
Polymer International ( IF 2.9 ) Pub Date : 2021-08-14 , DOI: 10.1002/pi.6284 Filip Marinković 1 , Dušan Popović 1 , Jelena Jovanović 2 , Branislav Stanković 3 , Sanja Jevtić 4 , Borivoj Adnadjević 3
Affiliation
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The effect of the weight fraction of NaA zeolite on thermal properties (specific heat capacity, thermal diffusivity, thermal conductivity) and dielectric properties (electrical conductivity, real and imaginary electric permittivity) of composites based on low-density polyethylene (LDPE) and NaA zeolite is examined. Composite samples containing from 5 to 30 wt% zeolite are prepared using the compression molding technique. The degree of dispersion and the weight fraction of filler in the LDPE/NaA zeolite composites are determined using X-ray diffraction. A linear decrease in the values of the specific heat capacity with an increase in the weight fraction of zeolite is observed using differential scanning calorimetry. The laser flash method is used to determine the thermal diffusivity of the composites. An increase in effective thermal diffusivity and abrupt increase in the range from 15 to 20 wt% of zeolite are established. It is demonstrated that effective thermal conductivity increases with an increase in the weight fraction of zeolite, and an abrupt increase in the range from 15 to 20 wt% is observed. Dielectric spectroscopy measurements are performed to determine the real and imaginary parts of permittivity. An increase of real and imaginary parts of permittivity of LDPE/NaA zeolite composites, with increasing weight fraction of zeolite, is established. Two relaxation peaks of the imaginary parts of permittivity of LDPE/NaA zeolite composites are detected. An increase of electrical conductivity with increasing weight fraction of zeolite and abrupt increase in the range 15 to 20 wt% are noticed. © 2021 Society of Industrial Chemistry.
中文翻译：
低密度聚乙烯/NaA沸石复合材料的热介电性能
NaA沸石的重量分数对低密度聚乙烯（LDPE）和NaA沸石复合材料的热性能（比热容、热扩散率、热导率）和介电性能（电导率、实部和虚部介电常数）的影响被审查。使用压缩成型技术制备含有 5% 至 30%（重量）沸石的复合样品。使用 X 射线衍射测定 LDPE/NaA 沸石复合材料中填料的分散度和重量分数。使用差示扫描量热法观察到比热容值随着沸石重量分数的增加而线性降低。激光闪光法用于测定复合材料的热扩散率。建立了有效热扩散率的增加和沸石的 15 至 20 重量％范围内的突然增加。结果表明，有效热导率随着沸石重量分数的增加而增加，并且观察到从 15 到 20 重量％的范围内突然增加。进行介电光谱测量以确定介电常数的实部和虚部。随着沸石重量分数的增加，LDPE/NaA沸石复合材料的介电常数实部和虚部均增加。检测到LDPE/NaA沸石复合材料介电常数虚部的两个弛豫峰。注意到电导率随着沸石重量分数的增加而增加，并且在 15 至 20 重量％的范围内突然增加。© 2021 工业化学学会。
更新日期：2021-08-14
中文翻译：
低密度聚乙烯/NaA沸石复合材料的热介电性能
NaA沸石的重量分数对低密度聚乙烯（LDPE）和NaA沸石复合材料的热性能（比热容、热扩散率、热导率）和介电性能（电导率、实部和虚部介电常数）的影响被审查。使用压缩成型技术制备含有 5% 至 30%（重量）沸石的复合样品。使用 X 射线衍射测定 LDPE/NaA 沸石复合材料中填料的分散度和重量分数。使用差示扫描量热法观察到比热容值随着沸石重量分数的增加而线性降低。激光闪光法用于测定复合材料的热扩散率。建立了有效热扩散率的增加和沸石的 15 至 20 重量％范围内的突然增加。结果表明，有效热导率随着沸石重量分数的增加而增加，并且观察到从 15 到 20 重量％的范围内突然增加。进行介电光谱测量以确定介电常数的实部和虚部。随着沸石重量分数的增加，LDPE/NaA沸石复合材料的介电常数实部和虚部均增加。检测到LDPE/NaA沸石复合材料介电常数虚部的两个弛豫峰。注意到电导率随着沸石重量分数的增加而增加，并且在 15 至 20 重量％的范围内突然增加。© 2021 工业化学学会。
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