Title: Thermal and mechanical properties of polyurethane composites filled with thermally expanded hollow microspheres
Authors: Yu Bian; Younghwan Kwon; Jin Seuk Kim
Addresses: Department of Chemical Engineering, Daegu University, Gyeongsan, Gyeongbuk 38453, South Korea ' Department of Chemical Engineering, Daegu University, Gyeongsan, Gyeongbuk 38453, South Korea ' The 4th R&D Institute-2nd Directorate, Agency for Defense Development, Yuseong PO Box 35-42, Daejeon 34186, South Korea
Abstract: Polyurethane (PU) composites with various porosities and spherical pore structures were prepared using thermally expanded hollow thermoplastic microspheres. Thermal and mechanical properties of PU composites were mostly governed by the amount of porosity. The measured thermal conductivity of PU composites was estimated using theoretical models, proving the formation of spherical pore structures (ε ≈ 1) in PU matrix and serving as an internal porous material (EMT model < k < parallel model).
Keywords: insulation; expanded microsphere; hollow thermoplastic sphere.
International Journal of Nanotechnology, 2018 Vol.15 No.8/9/10, pp.701 - 706
Received: 08 May 2021
Accepted: 12 May 2021
Published online: 13 Mar 2019 *