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Berger, Isabelle J.
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document
Influence of polyolefin cross-contamination on the slow crack growth resistance of polyethylene pipe grade
Abstract
<p>In order to increase added value of plastics in terms improved circular economy, an increased use of recycled polymers becomes more and more important, also for the plastic pipes industry. Unfortunately, compared to specially designed virgin pipe grades, recycled polymers show deteriorated long-term properties. The current paper investigates the influence of different polyolefin cross-contaminations on the slow crack growth (SCG) resistance of a polyethylene (PE) pipe grade. Therefore, blends of a virgin PE100 with different contents of polypropylene homopolymer (PP-H), blow molding PE-HD, and a recycled first generation PE-HD pipe were manufactured and analyzed with the CRB test. The results demonstrate that 5 % of cross-contamination content already results in a significant reduction of SCG resistance and that the highest reduction is caused by blending with PP-H.</p>