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Azoalkanes: A Novel Class of Additives for Cross-Linking and Controlled Degradation of Polyolefins

✍ Scribed by Mélanie Aubert; Michael Roth; Rudolf Pfaendner; Carl-Eric Wilén

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
152 KB
Volume
292
Category
Article
ISSN
1438-7492

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✦ Synopsis

Abstract

A series of symmetrical and unsymmetrical azoalkanes were synthesized and their potential as a free‐radical source for rheology modification of polyolefins was investigated. The experimental results show that unsymmetrical azoalkanes, in particular N‐cyclohexyl‐N'‐tert‐octyldiazene (13), can be successfully used for manufacturing controlled‐rheology poly(propylene) and cross‐linked high‐density polyethylene. For example, the melt flow rate of a general‐purpose poly(propylene) (MFR = 14) could be increased to a value of 800 when 0.75 wt.‐% of azoalkane 13 was added during reactive processing. In parallel, it was found that 13 has a remarkable efficiency for free‐radical‐induced cross‐linking of high‐density polyethylene, resulting in similar gel contents to dicumyl peroxide.

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