2026-04-20T05:46:53Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/49282021-11-10T09:38:26Zcom_10259_4313com_10259_5086com_10259_2604col_10259_4314

00925njm 22002777a 4500 dc Reglero Ruiz, José A. author Vallejos Calzada, Saúl author Sanjuán Cortázar, Ana María author García García, Félix Clemente author Múgica, Mikel . author Rodríguez Pérez, Miguel Ángel . author García Pérez, José Miguel author 2018-02 Microcellular polymers have been produced by ScCO2 foaming, based on 1-vinyl-2-pyrrolidone (VP) and butyl-acrylate (BA). Three different copolymers were prepared, varying the compositions of VP and BA, following a simple radical polymerization process using an UV initiator. The samples a good foaming behavior and also excellent flexibility and handle ability, with expansion ratios between 1.53 and 1.72, and cell sizes in the microcellular range (below 5 mm). However, it was observed that the gas distribution and, consequently, the cellular structure inside the polymer foams was highly dependent on the VP and BA proportions, leading to very different thermal conductivity values, even for similar volume gas fraction values. These results were related to the copolymer nanostructuration, which seems to have an influence in the final pore structure, thus opening the possibility of designing microcellular foams with similar macroscopic characteristics but different thermal conductivity values 0021-8995 http://hdl.handle.net/10259/4928 doi.org/10.1002/app.45872 foams porous materials radical polymerization thermal properties Microcellular polymeric foams based on 1‐vinyl‐2‐pyrrolidone and butyl‐acrylate with tuned thermal conductivity