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Tips for grinding polymeric materials with a planetary ball mill

There are a few tricks for grinding polymeric materials using a planetary ball mill because of heat generated and accumulated during ball milling process. 
1. The material temperature may need to be cooled below Tg with liquid nitrogen or dry ice to let the material be brittle; 
2. The material may need to be ground with liquid nitrogen or dry ice or other liquids in wet grinding; 
3. Slower rotation speed and shorter milling time in order to avoid change of morphology of the material.

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