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← ScienceWhich mechanism causes increased molecular weight in polyethylene production, limiting its melt flow?
A)Chain termination via disproportionation
B)Chain transfer to polymer backbone✓
C)Beta-hydride elimination from catalyst
D)Olefin insertion into metal-alkyl bond
💡 Explanation
Chain transfer to polymer backbone increases molecular weight by creating branches. Higher molecular weight lowers melt flow because polymer chains intertwine more readily; therefore, rather than reactions liberating chains limiting propagation, the increased molecule size becomes dominant.
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