Abstract
The concentration of tetrahydrofuran (THF) was used to regulate the pore morphologies of PU films using a THF/N,N-dimethylformamide (DMF) binary solvent. Macro-void, micro-pore, and potential inter-connected pores are classified according to the cross-sectional FESEM images. Corresponding pore forming mechanisms are proposed. The water vapor permeability (WVP) was linked with total pore areas of different kinds of pores. Mechanical properties as a function of THF concentration was also investigated. Optimized PU coating could be achieved at a 40 wt% THF bearing the tensile stress, strain, toughness, and WVP of 9.2 ± 0.6 MPa, 1063.7 ± 57.1%, 43.6 ± 3.8 MJ m−3, and 1894.3 ± 41.3 g m−2·day−1, respectively. This provides an alternative avenue for the production of PU coating with balanced mechanical property and WVP.
Published Version
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