Effect of hyperbranched polyurethane on the properties of PET-based polyurethane films

In order to improve the mechanical properties of the adhesives in PET-based solid propeliam, the hyperbranched Polyurethane was used as a phase to the formation of semi-IPN with PET-based Polyurethane (PU). The results showed that the addition of hyperbranched Polyurethane can significantly improve the mechanical properties of PET film, with the maximum elongation of 650. 14% which is 2. 09 times of the blank PET film under the same case of R value. The tensile strength of the hyperbranched polyurethane modified PET films with the R value of 1. 5 was improved significantly to the maximum of 1. 64MPa which is 2. 23 times of the blank PET film. The addition of hyperbranched polyurethane played a very good role in strengthening and toughening modification of PET films.