Abstract
This thesis is divided into two parts. The 1st discusses the porosity improvement of polyurethane (PU) films and water vapor permeability (WVP) by LiCl addition. Addition of LiCl to PU improves the porous structure and is evident by WVP tests. We compare results of the WVP and the BET analyses and find that WVP is related to size and volume of pores. The 2nd part focuses on mechanical property of carbon nanotubes/polyurethane (CNTs/PU) films. Carbon nanotubes (CNTs) act as reinforcing elements and enhance strength of porous PU. Excess of CNTs in PU reduces PU strength and also WVP.