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Lobos, Juan Thirumuruganandham, Saravana Prakash Rodríguez Pérez, Miguel Ángel 2023-09-11T07:57:58Z 2023-09-11T07:57:58Z 2022 Polymers, 2022, Vol. 14, Nº. 19, 4082 2073-4360 https://uvadoc.uva.es/handle/10324/61500 10.3390/polym14194082 4082 19 Polymers 14 2073-4360 LDPE (low-density polyethylene) foams were prepared using the improved compression moulding technique (ICM) with relative densities ranging from 0.3 to 0.7 and with different levels of chemical blowing agents (from 1% to 20%). The density gradients, cellular structure and thermal conductivity of the foams were characterized. The density and amount of CBA used were found to have a significant effect on the cellular structure both at the mesoscale (density gradients) and at the microscale (different cell sizes and cell densities). In addition, the thermal conductivity of the samples is very sensitive to the local structure where the heat flux is located. The technique used to measure this property, the Transient Plane Source method (TPS), makes it possible to detect the presence of density gradients. A simple method for determining these gradients based on thermal conductivity data was developed. eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ © 2022 The Authors Atribución 4.0 Internacional Compression molding Física de la materia condensada Plastic foams Espumas poliméricas Polymers Polyethylene Polietileno - Propiedades térmicas Thermal conductivity Calor - Conducción Density gradients, cellular structure and thermal conductivity of high-density polyethylene foams by different amounts of chemical blowing agent info:eu-repo/semantics/article