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

Ballesteros Agudo, Alberto Laguna Gutiérrez, Ester Cimavilla Román, Paula Puertas, María Luisa Esteban Cubillo, Antonio Santarén, Julio Rodríguez Pérez, Miguel Ángel 2021-08-25T08:58:52Z 2021-08-25T08:58:52Z 2021 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 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. eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ © 2021 The Authors Atribución 4.0 Internacional Influence of the dispersion of nanoclays on the cellular structure of foams based on polystyrene info:eu-repo/semantics/article