LAUSR

Polyurethane (PU) has become one of the most important segmented copolymers, due to it can be tailored to suit a wide range of application requirements by changing their structures and compositions. Amide, urethane and urea, which are capable of forming intermolecular hydrogen bonding to enhance the microphase separated morphology, are now used to consist segmented copolymers (poly(urethane-urea-amide) PUUA). In order to understand the usage temperature of the material and the protective measures which can be used, we wanted study the thermal stability and degradation process of PUUA. For study the stability of molecule structure, the thermal degradation behaviors of PUUA were extensively investigated with the thermogravimetric analysis (TG) under pure nitrogen and air, firstly. And the degradation activation energy of PUUA was further determined by the Flynn-Wall-Ozawa method. To find the order of thermal stability of bonds, thermogravimeter coupled with FTIR spectrophotometer (TG/FTIR) was used to research their gaseous products and their releasing intensity under nitrogen. In addition, the thermal decomposition behaviors of PUUA under air were also simulated by TG/FTIR. All results demonstrated that the bond of polyurethane decomposed firstly, both under air and nitrogen. And the protection of the bond of polyurethane was beneficial to prolong the service life of PUUA materials.