Solid‐catalyzed copolymerization reactions of ethylene and α‐olefins can produce complex mixtures generally regarded as “polyethylenes” (including linear low‐density polyethylene). The selective nature of those catalysts can lead to block‐like character in segments of polymer molecules, and these segments are sufficiently dissimilar (from a thermodynamic viewpoint) to allow for the possibility of microphase separation in the melt. Such a molecular‐level phase separation would substantially alter the …
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