Zobrazeno 1 - 10
of 104
pro vyhledávání: '"Fernando Villafañe"'
Publikováno v:
Nanomaterials, Vol 12, Iss 14, p 2409 (2022)
A family of transparent polyisocyanurate-polyurethane (PUR-PIR) aerogels with an interesting combination of physical properties were synthesized. First, their textural properties were analyzed aiming to study catalyst influence on the final porous st
Externí odkaz:
https://doaj.org/article/462955156ce14638a54e1035c0a86aad
Autor:
Beatriz Merillas, Alyne Lamy-Mendes, Fernando Villafañe, Luisa Durães, Miguel Ángel Rodríguez-Pérez
Publikováno v:
Gels, Vol 8, Iss 7, p 392 (2022)
In this work, silica aerogel composites reinforced with reticulated polyurethane (PU) foams have been manufactured having densities in the range from 117 to 266 kg/m3 and porosities between 85.7 and 92.3%. Two different drying processes were employed
Externí odkaz:
https://doaj.org/article/b787448642c4409cb16b0f5f22e0fa6a
Publikováno v:
Nanomaterials, Vol 12, Iss 13, p 2232 (2022)
A novel synthesis of polyurethane foam/polyurethane aerogel (PUF–PUA) composites is presented. Three different polyurethane reticulated foams which present the same density but different pore sizes (named S for small, M for medium, and L for large)
Externí odkaz:
https://doaj.org/article/7b0328c483df40ed9e015953edc92e21
Publikováno v:
Nanomaterials, Vol 12, Iss 9, p 1522 (2022)
Highly transparent polyisocyanurate–polyurethane (PUR–PIR) aerogels were synthesized, and their optical properties were studied in detail. After determining the density and structural parameters of the manufactured materials, we analyzed their op
Externí odkaz:
https://doaj.org/article/ceeb9cd158384883b7cd96fac8ffc1ab
Publikováno v:
Polymers, Vol 14, Iss 9, p 1807 (2022)
Polyurethane foams with a hybrid structure between closed cell and open cell were fabricated and fully characterized. Sound absorption measurements were carried out in order to assess their acoustic performance at different frequency ranges. The cell
Externí odkaz:
https://doaj.org/article/4db675b8b11448a1853f53892fa761df
Autor:
Mercedes Santiago-Calvo, María Carracedo-Pérez, María Luisa Puertas, Antonio Esteban-Cubillo, Julio Santaren, Fernando Villafañe, Miguel-Ángel Rodríguez-Pérez
Publikováno v:
Materials, Vol 15, Iss 1, p 381 (2022)
In the present study, a promising flame retardant consisting of 80 wt% silane-modified nanosepiolites functionalized with 20 wt% graphite (SFG) is used to obtain a synergistic effect principally focussed on the thermal stability of water-blown rigid
Externí odkaz:
https://doaj.org/article/bb71d4cc1ec347a1b9bb1eedd22e5045
Autor:
Mercedes Santiago-Calvo, Haneen Naji, Victoria Bernardo, Judith Martín-de León, Alberto Saiani, Fernando Villafañe, Miguel Ángel Rodríguez-Pérez
Publikováno v:
Polymers, Vol 13, Iss 18, p 3143 (2021)
A series of thermoplastic polyurethanes (TPUs) with different amounts of hard segments (HS) (40, 50 and 60 wt.%) are synthesized by a pre-polymer method. These synthesized TPUs are characterized by Shore hardness, gel permeation chromatography (GPC),
Externí odkaz:
https://doaj.org/article/5ad0e4cfde9a42b394f85b830b240d15
Publikováno v:
Polymers, Vol 13, Iss 17, p 2952 (2021)
To determine the effect of nanoclays and trapped air on the formation of rigid polyurethane foams, three different production procedures were used. To study the influence of mixing at atmospheric pressure, two approaches were carried out employing ei
Externí odkaz:
https://doaj.org/article/41b217c68ffd45b6b8d25218d0633171
Autor:
Anastasiia Galakhova, Mercedes Santiago-Calvo, Josias Tirado-Mediavilla, Fernando Villafañe, Miguel Ángel Rodríguez-Pérez, Gisbert Riess
Publikováno v:
Polymers, Vol 11, Iss 7, p 1192 (2019)
This paper presents a new methodology based on gas chromatography-mass spectrometry (GCMS) in order to separate and quantify the gases presented inside the cells of rigid polyurethane (RPU) foams. To demonstrate this novel methodology, the gas compos
Externí odkaz:
https://doaj.org/article/317732de99964048b859268b0fabe376
Autor:
Pablo Acuña, Zhi Li, Mercedes Santiago-Calvo, Fernando Villafañe, Miguel Ángel Rodríguez-Perez, De-Yi Wang
Publikováno v:
Polymers, Vol 11, Iss 1, p 168 (2019)
Three types of expandable graphite (EG) differing in particle size and expansion volume, are compared as flame retardant additives to rigid polyurethane foams (RPUFs). In this paper we discuss microstructure, thermal stability, fire behavior, and com
Externí odkaz:
https://doaj.org/article/a51ed8c3130744cdb097e43b6a403474