2026-04-14T18:28:00Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/480712022-07-18T09:32:51Zcom_10324_1158com_10324_931com_10324_894col_10324_1242

Influence of the dispersion of nanoclays on the cellular structure of foams based on polystyrene Ballesteros Agudo, Alberto Laguna Gutiérrez, Ester Cimavilla Román, Paula Puertas, María Luisa Esteban Cubillo, Antonio Santarén, Julio Rodríguez Pérez, Miguel Ángel Producción Científica In the present work blends of polystyrene (PS) with sepiolites have been pro-duced using a melt extrusion process. The dispersion degree of the sepiolites inthe PS has been analyzed by dynamic shear rheology and X-ray micro-computed tom ography. Sepiolites treated with quaternary ammonium salts(O-QASEP) are better dispersed in the PS matrix than natural sepiolites(N-SEP) or sepiolites organo-modified with silane groups (O-SGSEP). A perco-lated network is obtained when using 6.0 wt% of O-QASEP, 8.0 wt% of N-SEPand 10.0 wt% of O-SGSEP. It has been shown that multiple extrusion processeshave a negative effect on the polymer architecture. They produce a reductionin the length of the polymeric chains, and they do not lead to a better disper-sion of the particles in the polymer matrix. Foams have been produced using agas dissolution foaming process, where a strong effect of the dispersion degreeon the cellular structure of the different foams was found. The effects on thecellular structure obtained by using different types of sepiolites, different con-tents of sepiolites and different extrusion conditions have been analyzed. Thefoams produced with the formulations containing O-QASEP present the lowestcell size and the most homogeneous cellular structures. 2021-08-25T08:58:52Z 2021-08-25T08:58:52Z 2021 info:eu-repo/semantics/article Journal of Applied Polymer Science, 2021, e. 51373 0021-8995 https://uvadoc.uva.es/handle/10324/48071 10.1002/app.51373 51373 Journal of Applied Polymer Science 1097-4628 eng https://onlinelibrary.wiley.com/doi/full/10.1002/app.51373 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ © 2021 The Authors Atribución 4.0 Internacional Wiley SI