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  • Please use this identifier to cite or link to this item: https://repositorio.uti.edu.ec//handle/123456789/3794
    Title: Density Gradients, Cellular Structure and Thermal Conductivity of High-Density Polyethylene Foams by Different Amounts of Chemical Blowing Agent
    Authors: Lobos, Juan
    Thirumuruganandham, Saravana Prakash
    Rodríguez-Pérez, Miguel Angel
    Issue Date: 2022
    Publisher: Polymers. Open Access. Volume 14, Issue 19
    Abstract: 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.
    URI: https://www.mdpi.com/2073-4360/14/19/4082
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