2026-05-07T09:28:50Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/74172023-03-28T09:27:21Zcom_10259_3592com_10259_3591com_10259.4_106com_10259_2604com_10259_3843com_10259_4313com_10259_5086col_10259_3930col_10259_6162col_10259_4314

Rubio Aguinaga, Andrea Reglero Ruiz, José A. Muñoz Santamaría, María Asunción García García, Félix Clemente García Calvo, José Trigo López, Miriam 2023-02-07T13:34:52Z 2023-02-07T13:34:52Z 2022-10 0021-8995 http://hdl.handle.net/10259/7417 10.1002/app.53192 1097-4628 Low-density porous aramid films using inexpensive and widely available polymers as porosity promoters, that is, polyvinyl alcohol (PVA), poly(2-ethyl-2-oxazoline) (PEOx), and cellulose polyacetate (CA) were fabricated. Porous poly (m-phenylene isophthalamide) films were obtained by the standard casting procedure using mixtures of the aramid with either PVA, PEOx, or CA, followed by the removal of the porosity promoter polymers by immersing them in water or acetone. As a result, films with up to a 65% density reduction with pore sizes ranging from 0.02 to 10 μm and up to 30% increment in Young's modulus were obtained. In addition, the morphology of the films was homogeneous and was controlled by the proportion and nature of the porosity promoter polymer. The density reduction of materials plays a significant role in energy crises and the need for fuel reduction. This study revealed that it is possible to prepare low-density porous aramid films inexpensively without impairing their outstanding performance by using PVA in the casting procedure as a porosity promoter polymer. Regional Government of Castilla y León (Junta de Castilla y León), the Ministry of Science and Innovation MICIN and the European Union NextGenerationEU / PRTR, and the Spanish Agencia Estatal de Investigación (State Research Agency), Grant/Award Number: PID2019-108583RJ-I00/AEI/10.13039/501100011033 application/pdf eng Wiley Journal of Applied Polymer Science. 2022, V. 139, n. 47, e53192 https://doi.org/10.1002/app.53192 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-108583RJ-I00/ES/POLIAMIDAS AROMATICAS MICRO Y NANOCELULARES REFORZADAS COMO MATERIALES DE ALTAS PRESTACIONES EN APLICACIONES DE SEGURIDAD, PROTECCION Y TRANSPORTE/ Atribución 4.0 Internacional http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Films Mechanical propert Porous materials Química Chemistry Preparation of low‐density high‐performance porous aramid films using porosity promoter polymers info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Journal of Applied Polymer Science 139 47