Santiago-Calvo, Mercedes; Naji, Haneen; Bernardo, Victoria; Martin-de Leon, Judith; Saiani, Alberto; Villafane, Fernando; Rodriguez-Perez, Miguel Angel published an article in 2021, the title of the article was Analysis of the Foaming Window for Thermoplastic Polyurethane with Different Hard Segment Contents.Recommanded Product: 111-29-5 And the article contains the following content:
A series of thermoplastic polyurethanes (TPUs) with different amounts of hard segments (HS) (40, 50 and 60 weight%) are synthesized by a pre-polymer method. These synthesized TPUs are characterized by Shore hardness, gel permeation chromatog. (GPC), differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD), dynamic mech. thermal anal. (DMTA), and rheol. Then, these materials are foamed by a one-step gas dissolution foaming process and the processing window that allows producing homogeneous foams is analyzed. The effect of foaming temperature from 140 to 180°C on the cellular structure and on d. is evaluated, fixing a saturation pressure of 20 MPa and a saturation time of 1 h. Among the TPUs studied, only that with 50 weight% HS allows obtaining a stable foam, whose better features are reached after foaming at 170°C. Finally, the foaming of TPU with 50 weight% HS is optimized by varying the saturation pressure from 10 to 25 MPa at 170°C. The optimum saturation and foaming conditions are 25 MPa and 170°C for 1 h, which gives foams with the lowest relative d. of 0.74, the smallest average cell size of 4μm, and the higher cell nucleation d. of 8.0 x 109 nuclei/cm3. As a final conclusion of this investigation, the TPU with 50 weight% HS is the only one that can be foamed under the saturation and foaming conditions used in this study. TPU foams containing 50 weight% HS with a cell size below 15μ and porosity of 1.4-18.6% can be obtained using foaming temperatures from 140 to 180°C, saturation pressure of 20 MPa, and saturation time of 1 h. Varying the saturation pressure from 10 to 25 MPa and fixing the foaming temperature of 170°C and saturation pressure of 1 h results in TPU foams with a cell size of below 37μ and porosity of 1.7-21.2%. The experimental process involved the reaction of Pentane-1,5-diol(cas: 111-29-5).Recommanded Product: 111-29-5
The Article related to thermoplastic polyurethane hard segment foaming window, foaming window, foams, gas dissolution foaming, hard segment, thermoplastic polyurethane, Plastics Fabrication and Uses: Plastic Product Uses and other aspects.Recommanded Product: 111-29-5
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts