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Continuous sampling of product flows shows that the rate of styrene formation increases significantly when PS powder is converted into a cohesive state, a viscous, continuous material phase that tends to coat the grinding spheres, once the temperature of the grinding surfaces approaches the PS glass transition temperature (~100\u00b0C). This enhancement is attributed to intensified mechanical shear stresses that generate favorable reaction environments for depropagation of chain\u2010end radicals in the bulk of the cohesive state. 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