Mechanochemical Degradation of Amorphous Polymers with Ball-Mill Grinding
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We explored the influence of various ball-mill grinding process parameters and polymer properties on the mechanochemical degradation of amorphous polymers (polystyrene, PS, and polymethyl methacrylate, PMMA). Grinding frequency was found to be the most influential BMG parameter on degradation rates of PS, with ca. 17 times difference in rate constants between the lowest and highest frequencies studied. Molecular weight and molecular weight dispersity were both shown to indirectly influence degradation rates. Linear relationships were found between degradation rate constants and the initial glass transition temperature, for both PS and PMMA, suggesting that the glass transition temperature was a better predictor of the degradation rate than molecular weight (above a limiting molecular weight value). We also conducted ultrasonication experiments for comparison.