Effects of amphiphilic agent on thermal conductivity of boron nitride/poly(vinyl butyral) composites

•The platelet BN particles were oriented in poly(vinyl butyral) (PVB) matrix by tape-casting process.•The degree of BN orientation was estimated from XRD patterns of BN/PVB composites.•Surface treatment of BN with amphiphilic agent was confirmed by FT-IR and elemental analysis.•The BN/PVB composites with in-plane oriented 8-μm-sized BN particles showed a higher thermal conductivity than the other composites.