2026-04-29T10:18:09Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/50252022-05-20T13:22:29Zcom_10259_4313com_10259_5086com_10259_2604com_10259_4244col_10259_4314col_10259_4245

00925njm 22002777a 4500 dc Pascual Portal, Blanca Sol author Trigo López, Miriam author Ramos Rodríguez, Cipriano author Sanz Díez, Mª Teresa author Pablos, Jesús Luis author García García, Félix Clemente author Reglero Ruiz, José A. author García Pérez, José Miguel author 2019-01 We have deeply diminished the density of high performance aromatic polyamides or aramids. Thus, we have prepared microcellular films that at the same time maintain the outstanding thermal and mechanical properties characteristic of these high performance materials. Two different cellular aramids were produced, based on commercial poly(m-phenylene isophthalamide), one of them with an additional azide group. Microcellular structures have been obtained by adding ionic liquids combined to ScCO2 foaming process, with cell sizes between 0.6 and 4.7 µm and cell densities between 109 and 1011 cells cm3. The density was lowered for the commercial poly(m-phenylene isophthalamide) (Nomex® and Teijin Conex®) from 1.43 to 0.62 g cm−3 and from 1.48 to 0.31 g cm3 for the aramid containing the azide group. Foams present the following thermal and mechanical properties: 5% weight loss observed at T > 400 °C and relative Young modulus and tensile strength of 1.2 GPa (g cm−3)−1 and 60 MPa (g cm−3)−1, respectively. 0014-3057 http://hdl.handle.net/10259/5025 10.1016/j.eurpolymj.2018.11.007 Aramids Microcellular Ionic liquids ScCO2 foaming Polyamide Microcellular foamed aromatic polyamides (aramids). Structure, thermal and mechanical properties