What is polyurethane TPU?
Release time:
30 Aug,2019
Thermoplastic polyurethane (TPU) is a class of polyurethane that can be plasticized by heating and dissolved in solvents. Compared with compounded and cast polyurethanes, thermoplastic polyurethanes have virtually no or very few chemical crosslinks in their chemical structure; their molecules are essentially linear, yet they do exhibit a certain degree of physical entanglement.
The concept of physical crosslinking, first proposed in 1958 by Schollenberge C.S., refers to reversible "connection points" existing between linear polyurethane molecular chains that become active upon exposure to heat or solvents. These connection points are not true chemical crosslinks, yet they function in a manner analogous to chemical crosslinking. Thanks to this physical crosslinking effect, polyurethanes have developed a multiphase morphological structure theory. Hydrogen bonding in polyurethanes plays an enhancing role in their morphology and enables them to withstand higher levels of humidity.
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