Thermal conductivity of polymer composites with oriented boron nitride

• Published in: Thermochimica acta 2014-08, Vol.590, p.138-144
• Main Authors: Ahn, Hong Jun, Eoh, Young Jun, Park, Sung Dae, Kim, Eung Soo
• Format: Article
• Language: English
• Subjects: Amphiphilic agent; Orientation of boron nitride; Polymer composite; Thermal conductivity
• ISSN: 0040-6031; 1872-762X
• DOI: 10.1016/j.tca.2014.06.029

[Display omitted] •Thermal conductivity depended on the orientation of BN in the polymer matrices.•Hexagonal boron nitride (BN) particles were treated by C27H27N3O2 and C14H6O8.•Amphiphilic-agent-treated BN particles are more easily oriented in the composite.•BN/PVA composites with C14H6O8-treated BN showed the highest thermal conductivity.•Thermal conductivity of the composites was compared with several theoretical models. Thermal conductivity of boron nitride (BN) with polyvinyl alcohol (PVA) and/or polyvinyl butyral (PVB) was investigated as a function of the degree of BN orientation, the numbers of hydroxyl groups in the polymer matrices and the amphiphilic agents used. The composites with in-plane orientation of BN showed a higher thermal conductivity than the composites with out-of-plane orientation of BN due to the increase of thermal pathway. For a given BN content, the composites with in-plane orientation of BN/PVA showed higher thermal conductivity than the composites with in-plane orientation of BN/PVB. This result could be attributed to the improved degree of orientation of BN, caused by a larger number of hydroxyl groups being present. Those treated with C14H6O8 amphiphilic agent demonstrated a higher thermal conductivity than those treated by C27H27N3O2. The measured thermal conductivity of the composites was compared with that predicted by the several theoretical models.