Details

Autor(en) / Beteiligte

• Li, Jia-long
• Yin, Jing-hua
• Ji, Tianyi
• Feng, Yu
• Liu, Yuan-yuan
• Zhao, He
• Li, Yan-peng
• Zhu, Cong-cong
• Yue, Dong
• Su, Bo
• Liu, Xiao-xu

Titel

Microstructure evolution effect on high-temperature thermal conductivity of LDPE/BNNS investigated by in-situ SAXS

Ist Teil von

• Materials letters, 2019-01, Vol.234, p.74-78

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •LDPE composites doped by low contents layered BNNS were prepared.•The high-temperature thermal conductivity of the composite is observably improved.•The locations of BNNS in the LDPE matrix are confirmed through SAXS and XRD.•Microstructure evolution with temperature increasing is studied by in-situ SAXS.•The role of microstructure evolution is key to the enhancement. The low-density polyethylene (LDPE) and its composites incorporated boron nitride nanosheets (BNNS) (≤5 wt%) were fabricated and their thermal conductivities (K) as a function of temperature (20–80 °C) were measured. The K of the composite filled with 5 wt% BNNS increased 22% at room temperature and 48% at a high-temperature (below melting point) compared with pure LDPE. In order to reveal the enhancement mechanism for the high-temperature K of the composites, the microstructure evolution of the samples with temperature increasing was investigated by in-situ Small Angle X-ray Scattering (SAXS). The results show that the structural stability with temperature increasing and the lower interfacial thermal resistance are favorable for high-temperature K of the composites. This work provides a new recognition for the effect of microstructure evolution on high-temperature K of LDPE-based composites. It is hoped that the research will be instructive for enhancing K of LDPE-based composites by low-content doping and making them well-suited for the high-temperature practical applications.