Abstract
Alumina nanofibers were formed by heating poly(vinyl alcohol) (PVA)/boehmite composite nanofibers at various temperature. Polyurethane sheets containing the alumina nanofibers were formed by impregnation of alumina nanofiber mats with polyurethane. Thermal conductivity of the sheet containing the non-porous α-alumina nanofibers of 5.7 vol% was 1.29 W/mK. The aligned nanofibers act as a linear heat-transfer pathway in the sheet and thus high thermal conductivity was achieved at a low alumina content. The sheets containing the aligned alumina nanofibers had anisotropic thermal conductivity in the plane direction of the sheet.
