Abstract
We have investigated certain physical and mechanical properties of linear polyethylene that had been crosslinked under high pressure with various amounts of di-tertiary butyl peroxide. Good correlation was obtained between the amount of peroxide used and the density of the crosslinked polymer. The shear modulus also gave good correlation at temperatures below the crystalline melting point, but not at higher temperatures. The gel content (by Soxhlet extraction) using tetralin showed a complex relationship. Toluene, white spirit, and xylene were unsatisfactory solvents for this work. Little relationship was observed between the amount of peroxide used and the tensile strength or elongation at break of the crosslinked polymer.
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