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Brabender Plasticorder studies of the process of crosslinking polyethylene

✍ Scribed by Moshe Narkis; Joseph Miltz

Publisher
John Wiley and Sons
Year
1968
Tongue
English
Weight
375 KB
Volume
12
Category
Article
ISSN
0021-8995

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✦ Synopsis

The process of crosslinking unfilled thermoplastic polyethylene has been followed with the aid of the Brabender Plasticorder. It is shown that extrusion conditions without any significant scorching can be obtained with this instrument. The maximum torque in the plastograms is discussed and shown not to be a correct criterion of crosslinking efficiency, since its value is intluenced by a process of shear grinding of the crosslinked polymer. The crosslinking is further continued after the maximum torque is reached.

The dependence of gel content on peroxide concentration is given.

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The processing of crosslinked polyethylene foam, which has a closed-cell structure, has been investigated. In this study, two types of linear low-density polyethylene (LL) produced by a metallocene catalyst were crosslinked by dicumyl peroxide (DCP). The expansion ratio of the foams decreases with i