Polyurethane-imide is a novel kind of po lymer with excellent heat-resistant and mechanical properties. This overview embracing microstructure, synthesis and properties of polyurethane-imide is given and provided representative examples to reflect the state of the research for polyurethane-imide. The microstructure includes molecular structure and phase structure. Synthesis of linear PUI and network PUI is given in next and, Mechanical properties, Thermal performance and other properties is also recommended. The shortages of PUI research is imperfection of synthesis and the theoretical analysis, so the prospect of the study on polyurethane-imide is also displayed.

A series of rigid polyurethane foams are synthesized via the reaction of isocyanate terminated polyimide prepolymers with polyether polyol. Deionized water and n-pentane are used for blowing agents. The prepolymers and polymers are characterized by conventional methods, and physical, mechanical and thermal properties are studied. The results show that in comparison to pure polyurethane foams, these rigid polymer foams exhibit improved thermal stability as well as good compressive property. SEM of the compressed body of rigid polyurethane-imide foams show that the destructive forms are open-type tear of the film and the breakdown of the cell body wall.

The polystyrene/styrene-ethylene/butylene-styrene composites were prepared by melt blending process in this paper. The mechanical properties of PS/SEBS composites were analyzed. The results showed that the impact strength of PS/SEBS composites could be increased with the content increasing of SEBS, meanwhile the tensile strength was lower than pure polystyrene. When the content of SEBS increased to 13 wt.%, the impact strength of PS/SEBS composites was 2.4 times higher than that of pure PS. The fractured surfaces of the specimens were characterized by scanning electron microscopy(SEM). The results showed that the impact fractured surfaces produced a lot of sliding along with the addition of SEBS. The particles of SEBS could be well dispersed in polystyrene matrix. From rheological properties studies and the values of the torque, it was suggested that the maximum torque of PS/SEBS composites decreased drastically.

A new generation of rigid polyurethane-imide foams were synthesized via the reaction of isocyanate terminated polyimide prepolymers extended by 3, 3-4, 4-benzo-phenonetetracarboxylic dianhydride with polyether polyol, and deionized water and pantane were used for blowing agent. The obtained polymers were analyzed with compression test and scanning electron microscopy (SEM). SEM analysis revealed the cellular structure with different density. The polyurethane-imide foams with high density had small cell diameter, thick film thickness and spherical shape. The opposite cellular structure appeared in low density polyurethane-imide foams with larger cell diameter, such as thin film thickness and polygonal cells. Compression tests exhibited the mechanical properties of PUIF increased with the density of polyurethane-imide foams increasing.