What is polyurethane TPU?
Release time:
30 Aug,2019
Thermoplastic polyurethane (TPU) is a type of polyurethane that can be plasticized by heating and dissolved in solvents. Compared with compound‑molded and cast polyurethanes, TPU has little or no chemical crosslinking in its chemical structure; its molecules are essentially linear, yet it exhibits a certain degree of physical crosslinking.
The concept of physical crosslinking, first proposed by Schollenberge C.S. in 1958, refers to reversible “junction points” between linear polyurethane molecular chains that respond to heat or solvents. Although these are not true chemical crosslinks, they function similarly to them. Due to this physical crosslinking, the polyurethane exhibits a multiphase morphological structure; hydrogen bonding within the polymer reinforces this morphology and enhances its resistance to higher humidity levels.
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