Effect of high energy ball milling on the structure and mechanical properties of cross-linked high density polyethylene
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The effects of high energy ball milling (HEBM) on the structure and some key-properties of crosslinked high density polyethylene (PEX) have been thoroughly examined with a combination of X-ray diffraction analysis, IR and Raman spectroscopy, differential scanning calorimetry, gel content measurements, and tensile properties tests. A structure–property relationship, which provides a reasonable explanation for the studied case has been developed based on the experimental results and their analysis. It is proposed that the HEBM provides some of the silane-grafted macromolecular chains, which have a specific orientation, with sufficient energy in order to crosslink and form small crystalline-like areas. The arrangement of chains in the “reformed” domains leads to a total increase of the overall crystallinity, but also a decrease of the crystalline size. The proposed model can also support the fact that by increasing the milling time, the overall crystallinity of PEX and some important mechanical properties are found to increase.
KeywordsHigh Density Polyethylene HDPE LDPE Siloxane Bond High Energy Ball Milling
The authors would like to thank Prof. Aldo Boccaccini of the University of Erlangen-Nurnberg for allowing the use of the Raman spectroscopy facilities available at Biometerials Department, and Mr. C. Dolle for performing these measurements. This study was financially supported by the Greek General Secretariat of Research and Development (09SYN-33-484).
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