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We investigated possible physical and chemical changes in inert polymers by means of mechanical milling. No chemical changes were observed. However, in polystyrene we found two glass temperatures after milling, in contrast to one glass temperature in the original material. Under certain conditions crystalline polyethylene transformed almost completely from the orthorhombic to the monoclinic structure.doi:10.4028/www.scientific.net/msf.235-238.211 fatcat:52ica6l37vdnlkm2ryidcfq4tq