Crosslinking of Polyolefin Foams

Abstract

This study investigates peroxide crosslinking of two low-density polyethylene grades of similar number average molecular weight but differing molecular weight distribution. At gel contents typically associated with dicumyl peroxide (DCP) crosslinked foams, crosslinking and melt tensile properties of the solid matrix, foaming behaviour and foam

The Thermal Conductivity of a Polyethylene Foam Block Produced by a Compression Molding Process

“…Each micrograph was analyzed by obtaining data from 10 parallel and equidistant reference lines following each principal direction. Apparent mean cell size along each direction [φ(X),φ(Y),φ(T)] was estimated by calculating the number of cells that intersected each reference line, so that the appropriate reference length was divided by the number of cells [13]. The previous result was multiplied by 1.62 because there is a relationship between the measured values, average length of cells which were randomly truncated, and the real diameter of the cells [14].…”

Processing and properties of an ethylene–vinyl acetate blend foam incorporating ethylene–vinyl acetate and polyurethane waste foams

“…1,[25][26][27] The cell size of the waste-EVA blend foam was calculated from the SEM micrographs with the use of a method reported elsewhere. 1,[25][26][27] The cell size of the waste-EVA blend foam was calculated from the SEM micrographs with the use of a method reported elsewhere.…”

“…The structural properties of the blend foams produced by the same polymer matrix depended strongly on the density (i.e., degree of packing). 1,[25][26][27] The cell size of the waste-EVA blend foam was calculated from the SEM micrographs with the use of a method reported elsewhere. 16 Figure 7 shows the effect of the waste foam addition on the cell size of the waste-EVA blend foam produced by the single-stage and heat-chill processes.…”

Prediction of Cushion Curves for Closed Cell Polyethylene-Based Foams. Part II: Experimental

“…For this purpose, foam samples were microtomed at low temperature to provide a smooth surface, which after gold coating, was examined by SEM using a JEOL JSM 820. Apparent mean cell size was measured by calculating the number of cells that intersected each reference line, and dividing the appropriate reference length by the number of cells (11) . The results obtained were multiplied by 1.62 to take into account the relationship between the average measured length of the randomly truncated cells and the real diameter of the cell (12) .…”