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Enhanced thermal conductivity of PE/BN composites through controlling crystallization behavior of PE matrix
Author(s) -
Zhao Tianbao,
Zhang Xianlong
Publication year - 2017
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.23880
Subject(s) - materials science , crystallization , composite material , annealing (glass) , boron nitride , composite number , polyethylene , exothermic reaction , thermal conductivity , melting point , conductivity , chemical engineering , chemistry , organic chemistry , engineering
In this article, in order to enhance the thermal conductivity of the polyethylene (PE)/boron nitride (BN) composites through controlling the crystallization behavior of the PE matrix, the crystallization and melting behavior of the PE in the PE/BN composites was investigated. When the BN content was more than 10 wt%, an extra weak exothermic peak ( T h ) at 130°C was observed. Moreover, after the annealing of the PE/BN composites at 130°C, the extra weak melting peaks ( T mh ) of the PE in the PE/BN composites were also observed and shifted to the high temperature with increasing annealing time, which proved that the T h was induced by PE crystallization. Meanwhile, the results of temperature‐dependent absorbance IR spectra of the PE/BN composites showed that the crystallization peak (729 cm −1 ) remarkably appeared at 130.2°C, indicating that the crystallization of the PE in the PE/BN composites can occur at 130.2°C. When the annealing time and temperature were 20 min and 130°C, the thermal conductivity of the PE/BN composite was 16% higher than that of the unannealed PE/BN composites. In addition, the results of the wide angle X‐ray diffraction (WAXD) showed that the BN particles had no influence on the PE crystalline form in the PE/BN composites. POLYM. COMPOS., 38:2806–2813, 2017. © 2015 Society of Plastics Engineers