Effects of glycerol monosterate on TPUs crystallization and its foaming behavior

Hossieny, Nemat; Nofar, Mohammadreza; Shaayegan, Vahid; Park, Chul

doi:10.1063/1.4873803

Cited by 1 publication

(1 citation statement)

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“…[5][6][7][8][9] The ratio of the HS to the SS (HS/SS ratio) significantly affects the processing condition and foaming behavior of TPU. [10][11][12][13][14][15] Hossieny et al 1 have shown that broader HS domains present in the microstructure of TPU lead to higher nucleation rate. They tried to foam TPUs containing different crystallinity ranges with butane in an autoclave batch foaming process.…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic polyurethane foams: From autoclave batch foaming to bead foam extrusion

Shabani

Fathi

Erlwein

et al. 2020

Journal of Cellular Plastics

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Two ester-based and one ether-based thermoplastic polyurethane grades have been used to produce thermoplastic polyurethane foams. The foaming process comprised pressure-induced batch foaming, foam extrusion, and bead foam extrusion by using an underwater granulator. Foam density and morphological properties, such as cell size, cell size distribution, and cell density, were measured through different analytical methods. Through autoclave batch foaming a minimum cell size of 10 µm and density of 202 kg/m3 is obtained, which is lower than the densities previously reported in the literature for thermoplastic polyurethane. Extrusion foaming however could not achieve the same range of foam expansion given that the lowest density achieved is 635 kg/m3 and a minimum cell size equal to 46 µm. The production of thermoplastic polyurethane bead foams is also reported for the first time. The minimum density of the obtained foamed beads is 306 kg/m3 and the lowest cell size is 55 µm.

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