Why is Aliphatic TPU Film More Resistant than Aromatic TPU Film ?

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TPU film is casting processed by TPU elastomer, which one is a type of engineering plastic material with high strength, high toughness, high elasticity and high modulus. Structurally, TPU is a multiphase block copolymer composed of diisocyanate, chain extender, and polyol. TPU is mainly divided into aromatic TPU with weak yellowing resistance and aliphatic TPU with strong yellowing resistance according to the type of diisocyanate.  Why is aliphatic TPU film more resistant to yellowing than aromatic TPU film?

 

Why is aromatics TPU not resistant to yellowing ?

Structurally, there is an easily oxidized methylene bridge between the two benzene rings of aromatic TPU, a similar structure will be generated during processing. The brown compound is easy to turn yellow under thermal oxidation and ultraviolet radiation.

Why is aliphatic TPU is no easy yellowing ?

Aliphatic TPU does not contain benzene rings, more stable and not easily affected by ultraviolet rays.

 

 

Aliphatic TPU base film is widely application on TPU PPF wrap, which is high durable, anti-fouling and anti-yellowing. POLYSAN, successfully develops and researches the TPU PPF wrap and aliphatic TPU base film, keep excellent physical properties and excellent appearance, no yellowing and for 8 years of natural equivalent weathering.