Abstract
Vibratory ball milling of cotton in the presence and absence of styrene was studied by electron paramagnetic resonance spectroscopy, gel permeation chromatography and ultraviolet resonance Raman (UVRR) spectroscopy. Mechanoradical formation in ball milling of cellulose was detected, but the radical content was significantly lower and the molar mass slightly higher in the presence of styrene. UVRR also showed a small but consistent increase in aromatic signal, even after 5 h acetone extraction. A small portion of styrene was attached to cellulose, which was observed as an increase in the aromatic band intensity. Stabilization or a slight increase in molar mass of the samples that were milled in the presence of styrene was also observed. Overall, under the studied conditions, ball milling is not sufficient to significantly polymerize styrene onto cellulose. For future trials of mechanochemical copolymerization, it is recommended that a vacuum or an inert atmosphere be used.
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