The code name (UR) is made by the polymerization of polyester (or polyether) and diisocyanamide lipid compounds. Its chemical structure is more complex than that of general elastic polymers. In addition to the recurring carbamate groups, the molecular chain often contains groups such as ester groups, ether groups, and aromatic groups.
The main chain of UR molecule is composed of soft segment and rigid segment inlaid; the soft segment is also called soft segment, which is composed of oligomer polyol (such as polyester, polyether, polybutadiene, etc.); the rigid segment is also It is called hard segment, which is composed of the reaction product of diisocyanate (such as TDI, MDI, etc.) and small molecule chain extender (such as diamine and glycol, etc.). The proportion of soft segments is more than that of hard segments. The polarity of the soft and hard segments is different. The hard segments have strong polarity and are easy to gather together to form many micro-divisions in the soft segment phase. This is called a microphase separation structure. Its physical and mechanical properties are similar to those of the microphase. The degree of separation has a lot to do with.
UR molecules have high strength and high elasticity due to the force of hydrogen bonds between the main chains.
Characteristics: It has the advantages of high hardness, good strength, high elasticity, high abrasion resistance, tear resistance, aging resistance, ozone resistance, radiation resistance and good electrical conductivity. It is unmatched by ordinary rubber.
